CN111502665B - Low-maturity oil shale ground heating device and application and evaluation method thereof - Google Patents

Abstract

The invention discloses a low-maturity oil shale ground heating device which comprises a heating device body, wherein the heating device body comprises a heating chamber and a cooling chamber; the bottom of the heating chamber is provided with a resistance heating box, and a heating furnace is arranged in the resistance heating box; the top of the heating chamber is provided with an exhaust port, a vacuum pump and a control switch; the vacuum pumping pump is connected with 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 top of the cooling chamber is provided with an air inlet which is detachably connected with a nitrogen cylinder through an air duct, and the heating furnace is also connected with a control device which can display the resistivity change in the heating furnace; the invention also discloses a method for performing low-maturity oil shale ground evaluation by using the device. The device can reduce the waste of energy, and the oil shale with lower maturity is promoted to mature by heating, so that the oil shale obtains rock information as much as possible to serve the future shale oil exploitation.

Description

Low-maturity oil shale ground heating device and application and evaluation method thereof

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

With the deep research of shale oil and the continuous progress of exploration and development technology, shale oil has become the focus of oil and gas exploration in various countries in the world, and the geological exploration and investigation work of oil shale aims at finding oil shale deposits with development significance, and finding out the quality and quantity of minerals and the technical conditions of exploitation and utilization. The method has rich oil shale resources in China, but most of the oil shale resources are in an immature state, so that the immature oil shale can be heated to promote the rock matrix to mature, the rock matrix can reach the standard of exploitation as soon as possible, and the evaluation work of the immature oil shale is an important part in the whole development process.

The surface dry distillation technology of the oil shale has been developed for nearly 200 years since the 30 th century. Currently, most oil shale retorts used industrially include chinese pacific retorts, aiveter and Galoter retorts of estonia, Petrosix retort of brazil, and ATP retort of australia. The instruments perform ground isolated air dry distillation on oil shale with higher maturity or oil shale to be mined to extract oil therein, but a relatively perfect ground evaluation system is not established for the oil shale with insufficient maturity at present. And the conventional mode for immature oil shale is high-temperature heating to promote shale maturation, but most of the cases do not know how long the shale is heated, so the heating time is often too long, and heat loss is caused.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a low-maturity oil shale ground heating device and an application and evaluation method thereof. And monitoring the resistivity change of the oil shale in real time in the heating process through a connected sensing system.

The invention is realized by the following technical scheme:

a low maturity oil shale ground heating device comprises a heating device body which is divided into a heating chamber and a cooling chamber by a partition board;

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

a temperature control knob for controlling the heating temperature in the heating furnace is arranged on one side of the heating chamber; the left side of the heating chamber is provided with a furnace door for opening and closing the heating furnace, one side of the furnace door is connected with the side surface of the heating chamber through a hinge, the other side of the furnace door is movably connected with the side surface of the heating chamber through a magnetic stripe, the inner side of the furnace door is provided with a first resistivity sensor, and the right side of the heating furnace, which is opposite to the first resistivity sensor, is also provided with a second resistivity sensor;

the top of the heating chamber is provided with an exhaust port, a vacuum pumping pump and a control switch, one end of the vacuum pumping pump is connected with the exhaust port through a special conduit, the other end of the vacuum pumping pump is electrically connected with the control switch, and the control switch is connected with a power plug through a lead; the vacuum pumping pump penetrates through the resistance heating box through a special conduit to be connected with the heating furnace;

the bottom of the cooling chamber is fixedly connected with a tray; a cooling chamber door is arranged on the right side of the cooling chamber, one side of the cooling chamber door is connected with the side surface of the cooling chamber through a hinge, and the other side of the cooling chamber door is movably connected with the side surface of the cooling chamber through a magnetic stripe;

the cooling chamber top is equipped with air inlet and gas outlet, the air inlet has the air pump through pipe connection, the air pump has the nitrogen cylinder through pipe connection, the gas outlet has gaseous recovery jar through pipe connection.

Further, the first and second resistivity sensors are electrically connected to a control device, which includes a processor and a display, the processor being configured to convert the resistivity detected by the first and second resistivity sensors into a form that is viewable through the display.

Further, be equipped with temperature-sensing ware in the cooling chamber, the cooling chamber front side is equipped with temperature monitor, temperature monitor with temperature-sensing ware electric connection, temperature-sensing ware with power plug electric connection.

Further, there is triangular prism shape arch heating furnace bottom, resistance heating incasement portion be equipped with triangular prism shape arch assorted triangular prism shape recess, the heating furnace with resistance heating case passes through triangular prism shape arch with triangular prism shape recess swing joint.

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

Further, the temperature adjusting range of the temperature control knob is 0-800 ℃.

Further, the special catheter comprises an inner layer, a middle layer and an outer layer, wherein the inner layer is a fluorosilicone rubber tube, the middle layer is a heat insulation layer made of glass fiber cotton materials, and the outer layer is a protective layer made of polyimide and rubber composite materials.

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

A method for evaluating the low maturity oil shale ground by using the low maturity oil shale ground heating device comprises the following steps:

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 to perform quantitative analysis.

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

1) the traditional ground dry distillation device usually causes heat loss due to too long heating time; the device of the invention can not only reduce the energy waste, but also complete the heating of the immature oil shale;

2) the method determines whether the immature shale reaches the maturity of a mining degree or not by using the resistivity curve;

3) according to the invention, the resistivity sensor and the sensing system connected with the resistivity sensor can be used for monitoring the resistivity change of the oil shale in real time in the heating process;

4) the arrangement of the sensing system is convenient for workers to stop heating immediately when the resistivity change reaches the standard of oil shale maturity, and further reduces the waste of energy;

5) the device disclosed by the invention is used for heating the ground of the oil shale with lower maturity to promote the oil shale to mature, so that workers can obtain rock information as much as possible, and powerful information is provided for future shale oil exploitation;

6) the device and the evaluation method can compare two groups of different data before heating and after heating maturation, and are convenient for workers to obtain information such as porosity, oil content, carbon-containing organic matter composition and the like of the oil shale through analysis.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is an overall configuration diagram of an apparatus according to example 1 of the present invention;

FIG. 2 is a left side view of the apparatus of example 1 of the present invention;

FIG. 3 is a cross-sectional view of the front side of the device of example 1 of the present invention;

FIG. 4 is a cross-sectional view of the left side of the apparatus of example 1 of the present invention;

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

wherein:

1. the body of the heating device is provided with a heating device,

11. a heating chamber,

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

117. a control switch 1171, switches A, 1172, switch B,

118. a first resistivity sensor, 119, a second resistivity sensor,

12. a cooling chamber is arranged in the air conditioner,

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

2. a partition plate;

3. a power plug;

4. a control device for controlling the operation of the motor,

41. processor, 42, display.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. The construction or operation of the invention not described in detail is well within the skill of the art and the common general knowledge in the art, and should be known to those skilled in the art.

Example 1

Please refer to fig. 1. The embodiment provides a low-maturity oil shale ground heating device, which comprises 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, the other side of the oven door 114 is movably connected with the side surface of the heating chamber 11 through a magnetic stripe, a first resistivity sensor 118 is arranged on the inner side of the oven door 114, and a second resistivity sensor 119 is arranged at the position of the right side of the heating oven 112, which is right opposite to the first resistivity sensor 118;

the top of the heating chamber 11 is provided with an exhaust port 115, a vacuum pumping pump 116 and a control switch 117, 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 passes through the resistance heating box 111 through a special conduit to be connected with the heating furnace 112;

a tray 121 is fixedly connected to the bottom of the cooling chamber 12; 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 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 gas bottle 126 through a conduit, and the air outlet 124 is connected with an air recovery tank 127 through a conduit.

The first resistivity sensor 118 and the second resistivity sensor 119 are also electrically connected to a control device 4, the control device 4 comprising a processor 41 and a display 42, the processor 41 being adapted to convert the resistivity detected by the first resistivity sensor 118 and the second resistivity sensor 119 into a form that is visible through the display.

The control device 4 of the present embodiment is a computer.

A temperature sensor 128 is arranged in the cooling chamber 12, a temperature display 129 is arranged on the front side of the cooling chamber 12, the temperature display 129 is electrically connected with the temperature sensor 128, and the temperature sensor 128 is electrically connected with the power plug 3.

There is triangular prism shape arch heating furnace 112 bottom, resistance heating box 111 is inside be equipped with the protruding assorted triangular prism shape recess of triangular prism shape, heating furnace 112 with resistance heating box 111 passes through the triangular prism shape arch with triangular prism shape recess swing joint.

The control switch 117 includes a switch a1171 for turning on or off the evacuation pump 116 and a switch B1172 for turning on or off the resistance heating box 111.

The temperature adjusting range of the temperature control knob 113 is 0-800 ℃.

The special catheter comprises an inner layer, a middle layer and an outer layer, wherein the inner layer is a fluorosilicone rubber tube, the middle layer is a heat insulation layer made of glass fiber cotton materials, and the outer layer is a protective layer made of polyimide and rubber composite materials.

Example 2

The embodiment provides application of the low-maturity oil shale ground heating device in the aspect of evaluation of the immature oil shale ground.

Example 3

On the basis of the embodiment 1 and the embodiment 2, the present embodiment provides a method for evaluating a low maturity oil shale ground by using the low maturity oil shale ground heating apparatus, including:

step one, sample preparation: breaking 300g of oil shale samples, and analyzing the organic matter type of the oil shale by taking 150g of the oil shale samples through a Fourier infrared spectrum analyzer; another 60g sample is used for mercury injection experiment; another 60g of sample is taken to test the oil content 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 min;

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 second step into the heating chamber, closing the furnace door, opening a switch A on a control switch, starting a vacuum pumping pump, exhausting air in the heating chamber after working for 5min, and closing the switch A on the control switch, thereby closing the vacuum pumping pump;

step four, heating: after vacuumizing, turning on a switch B on a control switch, starting a resistance heating box, and heating the resistance heating box to the temperature of 450 ℃;

step five, cooling: observing the change of the resistivity image, closing a switch B on a control switch when the resistivity image is greatly improved and is basically stable and unchanged, thereby closing a resistance heating box, opening a furnace door of a heating chamber, taking out a heated shale sample, then closing the furnace door of the heating chamber, opening a cooling chamber door, putting the taken out heated shale sample on a tray of the cooling chamber, closing the cooling chamber door, introducing nitrogen for cooling, closing the cooling chamber door, opening an air pump, introducing nitrogen for cooling, continuously introducing air for cooling for 30min, stopping cooling when the temperature of the cooling chamber is 25 ℃, and taking out the sample;

step six, detection: taking 150g of the cooled sample, placing the sample in the Fourier infrared spectrum analyzer again, and analyzing the organic matter type of the mature oil shale; taking 30g of the cooled sample for mercury injection test; then 30g of sample is taken to test the oil content by a chloroform asphalt A method;

and seventhly, comparing the data of the immature oil shale with the data of the mature oil shale to perform quantitative analysis.

Example 4

On the basis of the embodiment 1 and the embodiment 2, the present embodiment provides a method for evaluating a low maturity oil shale ground by using the low maturity oil shale ground heating apparatus, including:

step one, sample preparation: crushing 400g of oil shale samples, and analyzing the organic matter type of the oil shale by a Fourier infrared spectrum analyzer from 200g of the oil shale samples; another 100g of sample is used for mercury injection experiment; another 50g of sample is taken to test the oil content by a chloroform asphalt A method; the remaining 50g of sample was left for use;

step two, standing: standing the sample subjected to Fourier infrared spectrum analysis in a nitrogen environment for 30 min;

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 second step into the heating chamber, closing the furnace door, opening a switch A on a control switch, starting a vacuum pumping pump, exhausting air in the heating chamber after working for 5min, and closing the switch A on the control switch, thereby closing the vacuum pumping pump;

step four, heating: after vacuumizing, turning on a switch B on a control switch, starting a resistance heating box, and heating the resistance heating box to the temperature of 600 ℃;

step five, cooling: observing the change of the resistivity image, closing a switch B on a control switch when the resistivity image is greatly improved and is basically stable and unchanged, thereby closing a resistance heating box, opening a furnace door of a heating chamber, taking out a heated shale sample, then closing the furnace door of the heating chamber, opening a cooling chamber door, putting the taken out heated shale sample on a tray of the cooling chamber, closing the cooling chamber door, introducing nitrogen for cooling, closing the cooling chamber door, opening an air pump, introducing nitrogen for cooling, continuously introducing air for cooling for 40min, stopping cooling when the temperature of the cooling chamber is 20 ℃, and taking out the sample;

step six, detection: taking 100g of the cooled sample, placing the sample in the Fourier infrared spectrum analyzer again, and analyzing the organic matter type of the mature oil shale; taking 50g of the cooled sample for mercury injection test; taking the remaining 50g of sample, and testing the oil content of the sample by a chloroform asphalt A method;

and seventhly, comparing the data of the immature oil shale with the data of the mature oil shale to perform quantitative analysis.

Example 5

On the basis of the embodiment 1 and the embodiment 2, the present embodiment provides a method for evaluating a low maturity oil shale ground by using the low maturity oil shale ground heating apparatus, including:

step one, sample preparation: breaking 600g of oil shale samples, and analyzing the organic matter type of the oil shale by taking 300g of the samples through a Fourier infrared spectrum analyzer; another 120g sample is taken for mercury injection experiment; another 120g sample is taken to test the oil content 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 60 min;

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 second step into the heating chamber, closing the furnace door, opening a switch A on a control switch, starting a vacuum pumping pump, exhausting air in the heating chamber after working for 5min, and closing the switch A on the control switch, thereby closing the vacuum pumping pump;

step four, heating: after vacuumizing, turning on a switch B on a control switch, starting a resistance heating box, and heating the resistance heating box to the temperature of 650 ℃;

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

step six, detection: taking 300g of the cooled sample, placing the sample in the Fourier infrared spectrum analyzer again, and analyzing the organic matter type of the mature oil shale; taking a cooled sample of 75g for a mercury injection experiment; then taking the remaining 75g of sample to test the oil content by a chloroform asphalt A method;

and seventhly, comparing the data of the immature oil shale with the data of the mature oil shale to perform quantitative analysis.

The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading by those skilled in the art, and are not intended to limit the scope of the invention in which the invention may be practiced, and therefore, they are not technically essential, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to be within the scope of the invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Claims (9)

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, the other side of the oven door (114) is movably connected with the side surface of the heating chamber (11) through a magnetic stripe, a first resistivity sensor (118) is arranged on the inner side of the oven door (114), and a second resistivity sensor (119) is arranged at the position, right opposite to the first resistivity sensor (118), on the right side of the heating oven (112);

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 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) passes through the resistance heating box (111) through a 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. A low maturity oil shale surface heating apparatus as set forth in claim 1, 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.

3. 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).

4. 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.

5. 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).

6. 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 ℃.

7. The low maturity oil shale ground heating apparatus of claim 1, wherein the 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.

8. Use of a low maturity oil shale ground heating apparatus as claimed in any one of claims 1 to 7 in connection with the evaluation of immature oil shale ground.

9. A method for evaluating a low maturity oil shale ground utilizing the low maturity oil shale ground heating apparatus of any one of claims 1-7, 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.

Images