CN111502665A - A low-maturity oil shale ground heating device and its application and evaluation method - Google Patents

Abstract

The invention discloses a low-maturity oil shale ground heating device, which comprises a heating device body, the heating device body includes a heating chamber and a cooling chamber; a resistance heating box is arranged at the bottom of the heating chamber, and a heating furnace is arranged in the resistance heating box; The top is provided with an exhaust port, a vacuum pump and a control switch; the vacuum pump is connected to the heating furnace through a special conduit; the bottom of the cooling chamber is provided with a tray, and the right side of the cooling chamber is provided with a cooling chamber door; The gas port is detachably connected with a nitrogen bottle through an air guide pipe, and the heating furnace is also connected with a control device that can display the change of resistivity in the heating furnace; the invention also discloses a method for evaluating the low-maturity oil shale ground with the device of the invention . The device of the invention can reduce the waste of energy, and promote the maturity of oil shale with low maturity by heating, so that it can obtain as much rock information as possible to serve the future shale oil exploitation.

Description

A low-maturity oil shale ground heating device and its application and evaluation method

【Technical field】

The invention relates to the technical field of geological exploration of oil shale, in particular to a low-maturity oil shale ground heating device and an application and evaluation method thereof.

【Background technique】

With the deepening of shale oil research and the continuous progress of exploration and development technology, shale oil has become the focus of oil and gas exploration in countries around the world. The quality and quantity of minerals and the technical conditions for mining and utilization. my country has abundant oil shale resources, but most of them are in an immature state. Therefore, for immature oil shale, heating can be used to promote the maturity of rock mother, so that it can reach the standard that can be exploited as soon as possible. The evaluation of shale is an important part of the whole development process.

The ground retorting technology of oil shale has a history of nearly 200 years since the development in the 1830s. At present, oil shale retort furnaces that are widely used in industry include Fushun retort furnaces in China, Kivter retort furnaces and Galoter retort furnaces in Estonia, Petrosix retort furnaces in Brazil, and ATP retort furnaces in Australia. Such instruments are used to isolate and air dry distillation of oil shale with high maturity or oil shale to be mined to extract the oil in it, but for oil shale with insufficient maturity, a relatively perfect ground has not yet been established. Evaluation System. Moreover, the conventional method for immature oil shale is high-temperature heating to promote shale maturity, but in most cases, it is not known how long it will be heated, so the heating time is often too long, resulting in heat loss.

[Content of the invention]

In order to solve the problems existing in the above-mentioned prior art, the present invention provides a low-maturity oil shale ground heating device and an application and evaluation method thereof. The resistivity curve is used to determine whether the immature shale reaches the maturity of the exploitable level. When the oil shale enters the mature stage, a large amount of non-conductive hydrocarbon fluids will be produced, which often results in the resistivity value of mature source rocks being higher than that of immature source rocks. Through the connected sensing system, the change of the resistivity of the oil shale during the heating process is monitored in real time.

The present invention is achieved through the following technical solutions:

A low-maturity oil shale ground heating device, characterized in that it comprises a heating device body, and the heating device body is divided into a heating chamber and a cooling chamber by a partition plate;

A resistance heating box is welded at the bottom of the heating chamber, and a heating furnace is movably connected in the resistance heating box;

One side of the heating chamber is provided with a temperature control knob for controlling the heating temperature in the heating furnace; the left side of the heating chamber is provided with a furnace door for opening and closing the heating furnace, and one side of the furnace door is connected to the heating furnace The side of the chamber is connected by a hinge, and the other side of the furnace door is movably connected with the side of the heating chamber by a magnetic strip;

The top of the heating chamber is provided with an exhaust port, a vacuum pump and a control switch. One end of the vacuum pump is connected to the exhaust port through a special conduit, and the other end of the vacuum pump is electrically connected to a control switch. A power plug is connected through a wire; the vacuum pump is connected to the heating furnace through the resistance heating box through a special conduit;

The bottom of the cooling chamber is fixedly connected with a tray; the right side of the cooling chamber is provided with a cooling chamber door, one side of the cooling chamber door and the side surface of the cooling chamber are connected by hinges, and the other side of the cooling chamber door is connected to the The side of the cooling chamber is movably connected by a magnetic strip;

The top of the cooling chamber is provided with an air inlet and an air outlet, the air inlet is connected to an air pump through a conduit, the air pump is connected to a nitrogen bottle through a conduit, and the air outlet is connected to a gas recovery tank through a conduit.

Further, a first resistivity sensor is provided on the inner side of the furnace door, and a second resistivity sensor is also provided on the right side of the heating furnace at a position facing the first resistivity sensor.

Further, the first resistivity sensor and the second resistivity sensor are also electrically connected with a control device, the control device includes a processor and a display, and the processor is used to connect the first resistivity sensor and the second resistivity sensor. The resistivity detected by the rate sensor is converted into a form viewable by the display.

Further, a temperature sensor is arranged in the cooling chamber, a temperature display is arranged on the front side of the cooling chamber, the temperature display is electrically connected with the temperature sensor, and the temperature sensor is electrically connected with the power plug connect.

Further, the bottom of the heating furnace is provided with a triangular prism-shaped protrusion, the interior of the resistance heating box is provided with a triangular prism-shaped groove matching the triangular prism-shaped protrusion, and the heating furnace and the resistance heating box pass through. The triangular prism-shaped protrusion is movably connected with the triangular prism-shaped groove.

Further, the control switch includes a switch A for turning on or off the vacuum pump and a switch B for turning on or off the resistance heating box.

Further, the temperature adjustment range of the temperature control knob is 0-800°C.

Further, the special catheter includes an inner layer, a middle layer and an outer layer, the inner layer is a fluorosilicone rubber tube, the middle layer is a thermal insulation layer made of glass fiber wool material, and the outer layer is a polyimide A protective layer made of amine-rubber composites.

The application of a low-maturity oil shale surface heating device in the surface evaluation of immature oil shale.

A method for evaluating low-maturity oil shale ground by using the low-maturity oil shale ground heating device, comprising:

Step 1, sample preparation: 300-500g oil shale samples are crushed, and 1/2 of the samples are taken to analyze the types of organic matter in the oil shale by a Fourier transform infrared spectrometer; another 1/5-1/4 is taken. The sample is used for mercury intrusion experiment; another 1/5~1/4 sample is taken to test its oil content by chloroform bitumen A method; the remaining samples are reserved for future use;

Step 2, standing: the sample after Fourier transform infrared spectroscopy analysis is left standing for 20 to 60 minutes in a nitrogen environment for use;

Step 3, vacuumize: connect the power plug to the power supply, open the furnace door of the heating chamber, put the sample after the second step into the heating furnace, close the furnace door, start the vacuum pump, and remove the air in the heating furnace, Turn off the vacuum pump after emptying;

Step 4, heating: after vacuuming, turn on the resistance heating furnace, adjust the temperature control knob, and heat the resistance heating furnace to a temperature of 450-650 °C;

Step 5: Cooling: Observe the change of the resistivity image on the display. When the image is greatly improved and basically stable, turn off the resistance heating box, take out the heated shale sample, and put it on the tray of the cooling chamber. Close the door of the cooling chamber, open the air pump and let in nitrogen for cooling, continue to ventilate and cool for 30-60 minutes, stop cooling when the temperature of the cooling chamber is 20-30 °C, and take out the sample;

Step 6, detection: take 1/2 of the cooled sample and place it in the Fourier transform infrared spectrometer again to analyze the type of organic matter in the mature oil shale; take 1/5 to 1/4 of the cooled sample for In the mercury intrusion experiment; then take the remaining 1/5 to 1/4 of the sample to test its oil content by the chloroform bitumen A method;

Step 7: Quantitatively analyze the data of immature oil shale and mature oil shale.

Compared with the prior art, the present invention has the following beneficial effects:

1) The traditional ground retorting device often leads to heat loss because the heating time is too long; and the device of the present invention can not only reduce energy waste, but also complete the heating of immature oil shale;

2) The present invention utilizes the resistivity curve to determine whether the immature shale reaches the maturity of the exploitable degree;

3) The present invention can monitor the change of the resistivity of the oil shale in the heating process in real time through the resistivity sensor and the sensing system connected to it;

4) The setting of the sensing system of the present invention is convenient for the staff to stop heating immediately when the resistivity change reaches the mature standard of oil shale, which further reduces the waste of energy;

5) Using the device of the present invention to heat the oil shale with low maturity on the ground to promote its maturity, so as to facilitate the staff to obtain as much rock information as possible, which is beneficial to provide powerful information for future shale oil exploitation;

6) The device and evaluation method of the present invention can be compared by two sets of different data before and after heating, which is convenient for staff to obtain information such as porosity, oil content, and carbon-containing organic matter composition of oil shale through analysis.

【Description of drawings】

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention.

Fig. 1 is the overall structure diagram of the device according to the first embodiment of the present invention;

2 is a structural diagram of the left side of the device according to Embodiment 1 of the present invention;

3 is a cross-sectional view of the front side of the device according to Embodiment 1 of the present invention;

4 is a cross-sectional view of the left side of the device in Embodiment 1 of the present invention;

Fig. 5 is the connection block diagram of the control device of the present invention;

in:

1. The body of the heating device,

11. Heating chamber,

111, resistance heating box, 112, heating furnace, 113, temperature control knob, 114, furnace door, 115, exhaust port, 116, vacuum pump,

117, control switch, 1171, switch A, 1172, switch B,

118, the first resistivity sensor, 119, the second resistivity sensor,

12. Cooling room,

121, tray, 122, cooling chamber door, 123, air inlet, 124, air outlet, 125, air pump, 126, nitrogen cylinder, 127, gas recovery tank, 128, temperature sensor, 129, temperature display;

2. Partition;

3. Power plug;

4. Control device,

41. Processor, 42. Display.

【Detailed ways】

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The structures or working principles not described in detail in the present invention belong to the prior art and common knowledge in the art, and should be known by those skilled in the art.

Example 1

See Figure 1. This embodiment provides a low-maturity oil shale ground heating device, including a heating device body 1, and the heating device body 1 is divided into a heating chamber 11 and a cooling chamber 12 by a partition plate 2;

A resistance heating box 111 is welded at the bottom of the heating chamber 11, and a heating furnace 112 is movably connected in the resistance heating box 111;

One side of the heating chamber 11 is provided with a temperature control knob 113 for controlling the heating temperature in the heating furnace 112; the left side of the heating chamber 11 is provided with a furnace door 114 for opening and closing the heating furnace 112. One side of 114 is connected with the side of the heating chamber 11 through a hinge, and the other side of the furnace door 114 is movably connected with the side of the heating chamber 11 through a magnetic strip;

The top of the heating chamber 11 is provided with an exhaust port 115, a vacuum pump 116 and a control switch 117. One end of the vacuum pump 116 is connected to the exhaust port 115 through a special conduit, and the other end of the vacuum pump 116 is connected to the control switch 117. Electrical connection, the control switch 117 is connected to the power plug 3 through a wire; the vacuum pump 117 is connected to the heating furnace 112 through the resistance heating box 111 through a special conduit;

A tray 121 is fixedly connected to the bottom of the cooling chamber 12; a cooling chamber door 122 is provided on the right side of the cooling chamber 12, one side of the cooling chamber door 122 is connected with the side surface of the cooling chamber 12 by a hinge, and the cooling chamber door The other side of 122 is movably connected to the side of the cooling chamber 12 through a magnetic strip;

The top of the cooling chamber 12 is provided with an air inlet 123 and an air outlet 124, the air inlet 123 is connected with an air pump 125 through a conduit, the air pump 125 is connected with a nitrogen cylinder 126 through a conduit, and the air outlet 124 is connected through a conduit There is a gas recovery tank 127 .

A first resistivity sensor 118 is provided on the inner side of the furnace door 114 , and a second resistivity sensor 119 is further provided on the right side of the heating furnace 112 at the position facing the first resistivity sensor 118 .

The first resistivity sensor 118 and the second resistivity sensor 119 are also electrically connected to a control device 4, and the control device 4 includes a processor 41 and a display 42, and the processor 41 is used to display the first resistivity. The resistivity detected by sensor 118 and second resistivity sensor 119 is converted into a form viewable through the display.

The control device 4 in this embodiment is a computer.

The cooling chamber 12 is provided with a temperature sensor 128, the front side of the cooling chamber 12 is provided with a temperature display 129, the temperature display 129 is electrically connected to the temperature sensor 128, and the temperature sensor 128 is connected to the temperature sensor 128. The power plug 3 is electrically connected.

The bottom of the heating furnace 112 has a triangular prism-shaped protrusion, and the resistance heating box 111 is provided with a triangular prism-shaped groove matching the triangular prism-shaped protrusion. The heating furnace 112 and the resistance heating box 111 The triangular prism-shaped protrusion is movably connected with the triangular prism-shaped groove.

The control switch 117 includes a switch A1171 for turning on or off the vacuum pump 116 and a switch B1172 for turning on or off the resistance heating box 111 .

The temperature adjustment range of the temperature control knob 113 is 0-800°C.

The special catheter includes an inner layer, a middle layer and an outer layer, the inner layer is a fluorosilicone rubber tube, the middle layer is an insulating layer made of glass fiber wool, and the outer layer is polyimide and rubber Protective layer made of composite material.

Example 2

This embodiment provides an application of a low-maturity oil shale ground heating device in the ground evaluation of immature oil shale.

Example 3

On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a method for evaluating low-maturity oil shale ground by using the low-maturity oil shale ground heating device, which is characterized in that:

Step 1, sample preparation: 300g of oil shale samples are crushed, and 150g of the samples are taken to analyze the types of organic matter in the oil shale by a Fourier transform infrared spectrometer; another 60g of samples are taken for mercury intrusion experiments; The 60g sample was tested for its oil content by the chloroform bitumen A method; the remaining samples were reserved for future use;

Step 2, standing: the sample after Fourier transform infrared spectroscopy analysis is left standing for 20min in a nitrogen environment;

Step 3, vacuumize: connect the power plug to the power supply, open the furnace door of the heating chamber, put the samples after standing in step 2 into the heating furnace, close the furnace door, turn on switch A on the control switch, and start the vacuum pump, After working for 5 minutes, the air in the heating furnace is exhausted, and the switch A on the control switch is turned off, thereby turning off the vacuum pump;

Step 4, heating: after vacuuming, turn on switch B on the control switch, turn on the resistance heating box, and heat the resistance heating box to a temperature of 450°C;

Step 5: Cooling: Observe the change of the resistivity image. When the image is greatly improved and basically stable, turn off the switch B on the control switch to turn off the resistance heating box, open the furnace door of the heating chamber, and take out the heating device. Then close the furnace door of the heating chamber and open the cooling chamber door, put the heated shale samples taken out on the tray of the cooling chamber, close the cooling chamber door, pass nitrogen for cooling, and close the cooling chamber Open the door, open the air pump and let in nitrogen for cooling, and continue to ventilate and cool for 30 minutes. At this time, when the temperature of the cooling chamber is displayed as 25 °C, the cooling is stopped, and the sample is taken out;

Step 6, detection: take 150g of the cooled sample and put it in the Fourier transform infrared spectrometer again to analyze the organic matter of the mature oil shale; take 30g of the cooled sample for mercury intrusion experiment; take another 30g sample Test its oil content by chloroform bitumen A method;

Step 7: Quantitatively analyze the data of immature oil shale and mature oil shale.

Example 4

On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a method for evaluating low-maturity oil shale ground by using the low-maturity oil shale ground heating device, which is characterized in that:

Step 1, sample preparation: 400g oil shale sample is broken up, and 200g of the sample is taken to analyze the types of organic matter in oil shale by Fourier transform infrared spectrometer; another 100g sample is taken for mercury intrusion experiment; another The 50g sample was tested for its oil content by the chloroform bitumen A method; the remaining 50g sample was reserved for future use;

Step 2, standing: the sample after Fourier transform infrared spectroscopy analysis is left standing for 30min in a nitrogen environment;

Step 3, vacuumize: connect the power plug to the power supply, open the furnace door of the heating chamber, put the samples after standing in step 2 into the heating furnace, close the furnace door, turn on switch A on the control switch, and start the vacuum pump, After working for 5 minutes, the air in the heating furnace is exhausted, and the switch A on the control switch is turned off, thereby turning off the vacuum pump;

Step 4, heating: after vacuuming, turn on switch B on the control switch, turn on the resistance heating box, and heat the resistance heating box to 600°C;

Step 5: Cooling: Observe the change of the resistivity image. When the image is greatly improved and basically stable, turn off the switch B on the control switch to turn off the resistance heating box, open the furnace door of the heating chamber, and take out the heating device. Then close the furnace door of the heating chamber and open the cooling chamber door, put the heated shale samples taken out on the tray of the cooling chamber, close the cooling chamber door, pass nitrogen for cooling, and close the cooling chamber Open the door, open the air pump and let in nitrogen for cooling, and continue to ventilate and cool for 40 minutes. At this time, when the temperature of the cooling chamber is displayed as 20 °C, the cooling is stopped, and the sample is taken out;

Step 6, detection: take 100g of the cooled sample and place it in the Fourier transform infrared spectrometer again to analyze the organic matter of the mature oil shale; take 50g of the cooled sample for mercury intrusion experiment; then take the rest The 50g sample was tested for its oil content by the chloroform bitumen A method;

Step 7: Quantitatively analyze the data of immature oil shale and mature oil shale.

Example 5

On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a method for evaluating low-maturity oil shale ground by using the low-maturity oil shale ground heating device, which is characterized in that:

Step 1, sample preparation: 600g oil shale sample is broken up, and 300g of the sample is taken to analyze the types of organic matter in the oil shale by Fourier transform infrared spectrometer; another 120g sample is taken for mercury intrusion experiment; another The 120g sample was tested for its oil content by the chloroform bitumen A method; the remaining samples were reserved for future use;

Step 2, standing: the sample after Fourier transform infrared spectroscopy analysis is left standing for 60min in a nitrogen environment;

Step 3, vacuumize: connect the power plug to the power supply, open the furnace door of the heating chamber, put the samples after standing in step 2 into the heating furnace, close the furnace door, turn on switch A on the control switch, and start the vacuum pump, After working for 5 minutes, the air in the heating furnace is exhausted, and the switch A on the control switch is turned off, thereby turning off the vacuum pump;

Step 4, heating: after vacuuming, turn on the resistance heating box by turning on the switch B on the control switch, and heat the resistance heating box to a temperature of 650°C;

Step 5: Cooling: Observe the change of the resistivity image. When the image is greatly improved and basically stable, turn off the switch B on the control switch to turn off the resistance heating box, open the furnace door of the heating chamber, and take out the heating device. Then close the furnace door of the heating chamber and open the cooling chamber door, put the heated shale samples taken out on the tray of the cooling chamber, close the cooling chamber door, pass nitrogen for cooling, and close the cooling chamber Open the door, open the air pump and let in nitrogen for cooling, and continue to ventilate and cool for 60 minutes. At this time, when the temperature of the cooling chamber is displayed as 20 °C, the cooling is stopped, and the sample is taken out;

Step 6, detection: take 300g of the cooled sample and place it in a Fourier transform infrared spectrometer again to analyze the type of organic matter in the mature oil shale; take 75g of the cooled sample for mercury intrusion experiment; then take the rest 75g of samples were tested for their oil content by the chloroform bitumen A method;

Step 7: Quantitatively analyze the data of immature oil shale and mature oil shale.

The structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation of the present invention. Therefore, it does not have technical substantive significance, and any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope of the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

Claims (10)

1. The low-maturity oil shale ground heating device is characterized by comprising a heating device body (1), wherein the heating device body (1) is divided into a heating chamber (11) and a cooling chamber (12) by a partition plate (2);

a resistance heating box (111) is welded at the bottom of the heating chamber (11), and a heating furnace (112) is movably connected in the resistance heating box (111);

a temperature control knob (113) for controlling the heating temperature in the heating furnace (112) is arranged on one side of the heating chamber (11); an oven door (114) for opening and closing the heating oven (112) is arranged on the left side of the heating chamber (11), one side of the oven door (114) is connected with the side surface of the heating chamber (11) through a hinge, and the other side of the oven door (114) is movably connected with the side surface of the heating chamber (11) through a magnetic strip;

an exhaust port (115), a vacuum pumping pump (116) and a control switch (117) are arranged at the top of the heating chamber (11), one end of the vacuum pumping pump (116) is connected with the exhaust port (115) through a special conduit, the other end of the vacuum pumping pump (116) is electrically connected with the control switch (117), and the control switch (117) is connected with a power plug (3) through a wire; the vacuum pump (117) penetrates through the resistance heating box (111) through a special conduit to be connected with the heating furnace (112);

the bottom of the cooling chamber (12) is fixedly connected with a tray (121); a cooling chamber door (122) is arranged on the right side of the cooling chamber (12), one side of the cooling chamber door (122) is connected with the side surface of the cooling chamber (12) through a hinge, and the other side of the cooling chamber door (122) is movably connected with the side surface of the cooling chamber (12) through a magnetic strip;

the cooling chamber (12) top is equipped with air inlet (123) and gas outlet (124), air inlet (123) have air pump (125) through pipe connection, air pump (125) have nitrogen gas bottle (126) through pipe connection, gas outlet (124) have gas recovery jar (127) through pipe connection.

2. The low-maturity oil shale ground heating device according to claim 1, wherein a first resistivity sensor (118) is arranged on the inner side of the furnace door (114), and a second resistivity sensor (119) is arranged on the right side of the heating furnace (112) opposite to the first resistivity sensor (118).

3. A low maturity oil shale surface heating apparatus as set forth in claim 2 wherein said first resistivity sensor (118) and second resistivity sensor (119) are further electrically connected to a control apparatus (4), said control apparatus (4) including a processor (41) and a display (42), said processor (41) being adapted to convert the resistivity detected by said first resistivity sensor (118) and second resistivity sensor (119) into a form viewable through said display.

4. The low maturity oil shale ground heating apparatus of claim 1, wherein a temperature sensor (128) is disposed in the cooling chamber (12), a temperature display (129) is disposed on the front side of the cooling chamber (12), the temperature display (129) is electrically connected to the temperature sensor (128), and the temperature sensor (128) is electrically connected to the power plug (3).

5. The low maturity oil shale ground heating device of claim 1, wherein the bottom of the heating furnace (112) is provided with a triangular prism-shaped protrusion, the inside of the resistance heating box (111) is provided with a triangular prism-shaped groove matched with the triangular prism-shaped protrusion, and the heating furnace (112) and the resistance heating box (111) are movably connected with the triangular prism-shaped groove through the triangular prism-shaped protrusion.

6. The low maturity oil shale ground heating apparatus of claim 1, wherein the control switch (117) includes a switch a (1171) for turning on or off the vacuum pump (116) and a switch B (1172) for turning on or off the resistance heating box (111).

7. The low-maturity oil shale ground heating device according to claim 1, wherein the temperature control knob (113) has a temperature adjusting range of 0-800 ℃.

8. The low maturity oil shale ground heating apparatus of claim 1, wherein the purpose-made conduit comprises an inner layer, a middle layer and an outer layer, the inner layer is a fluorosilicone rubber pipe, the middle layer is a thermal insulation layer made of glass fiber cotton material, and the outer layer is a protection layer made of polyimide and rubber composite material.

9. Use of a low maturity oil shale ground heating apparatus as claimed in any one of claims 1 to 8 in connection with the evaluation of immature oil shale ground.

10. A method for evaluating a low maturity oil shale ground utilizing the low maturity oil shale ground heating apparatus of any one of claims 1-8, comprising:

step one, sample preparation: smashing 300-500 g of oil shale sample, and analyzing the organic matter type of the oil shale by taking 1/2 samples through a Fourier infrared spectrum analyzer; another 1/5-1/4 sample is used for mercury injection experiment; testing the oil content of another 1/5-1/4 sample by a chloroform asphalt A method; the remaining sample is left for use;

step two, standing: standing the sample subjected to Fourier infrared spectrum analysis in a nitrogen environment for 20-60 min for later use;

step three, vacuumizing: connecting a power plug with a power supply, opening a furnace door of a heating chamber, putting the sample after standing in the step two into the heating furnace, closing the furnace door, starting a vacuum pumping pump, exhausting air in the heating furnace, and closing the vacuum pumping pump after exhausting;

step four, heating: after vacuumizing, heating the resistance heating furnace to the temperature of 450-650 ℃ by starting the resistance heating furnace and adjusting the temperature control knob;

step five, cooling: observing the change of a resistivity image on a display, closing a resistance heating box when the image is greatly improved and basically stable and unchanged, taking out a heated shale sample, putting the shale sample on a tray of a cooling chamber, closing a door of the cooling chamber, opening an air pump, introducing nitrogen for cooling, continuously ventilating and cooling for 30-60 min, stopping cooling when the temperature of the cooling chamber is 20-30 ℃, and taking out the sample;

step six, detection: 1/2 is taken from the cooled sample and placed in the Fourier infrared spectrum analyzer again, and the organic matter type of the mature oil shale is analyzed; taking 1/5-1/4 cooled samples for mercury intrusion experiments; taking the remaining 1/5-1/4 samples, and testing the oil content of the samples by a chloroform asphalt A method;

and seventhly, comparing the data of the immature oil shale with the data of the mature oil shale for quantitative analysis, and evaluating the immature oil shale through the difference of the two groups of data.

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