CN111965329A - Shale oil reservoir oil-containing property testing method - Google Patents
Shale oil reservoir oil-containing property testing method Download PDFInfo
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- 239000003079 shale oil Substances 0.000 title claims abstract description 41
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Abstract
The application provides a method for testing oil content of a shale oil reservoir, which comprises the following steps: A1. weighing the core sample and recording as G; A2. performing nuclear magnetic test on the core sample to obtain a nuclear magnetic spectrum of the nuclear magnetic pore volume of the core sample changing along with the transverse relaxation time T2 to obtain the total pore volume Vt of the core sample; A3. crushing the core sample, performing dry distillation test, and respectively recording the water yield and oil yield of the core sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; wherein the water yield of the core sample at 0-120 ℃ is movable water Vwm, the water yield of the core sample at 120-315 ℃ is clay bound water Vwr, and the water produced by the core sample at more than 315 ℃ is mineral lattice water; A4. the oil saturation of the core sample is 1-Vwr/Vt; the movable oil saturation of the core sample was Som ═ Vom/Vt, Vom ═ S1 × G/(1000 × ρ o); the lower limit of movable oil of the core sample is a transverse relaxation time T2 value corresponding to Vt-Vom in a nuclear magnetic spectrum; the method can accurately obtain the physical property parameters of the shale oil reservoir.
Description
Technical Field
The application relates to the technical field of shale gas, in particular to a method for testing oil content of a shale oil reservoir.
Background
The test flow for obtaining the oil saturation and the mobile oil saturation by the conventional nuclear magnetic centrifugation method comprises the following steps: (1) washing the column sample with oil, and drying to measure the pore volume and the porosity; (2) weighing the column sample, and recording the saturated water amount (volume) of the column sample; then, nuclear magnetism is measured on the column sample to obtain a T2 spectrum of pore volume frequency distribution; (3) centrifuging the column sample at high speed for more than 30min, weighing, and then measuring nuclear magnetism of the column sample to obtain a pore volume frequency distribution T2 spectrum of the centrifuged column sample; (4) and (3) comparing the T2 spectrums obtained in the steps (2) and (3) to obtain the volume occupied by the movable fluid, thereby calculating the oil saturation and the movable oil saturation.
However, because the oil reservoir of the shale between the salts is compact and grows in a shale manner and contains salt rocks and glauberite rocks, the drilled regular columnar sample is easy to absorb water, crack and break when meeting water or humid air, and the oil washing is difficult, so that the oil saturation and the movable oil saturation of the shale core sample cannot be accurately obtained by using the conventional nuclear magnetic centrifugation method.
Disclosure of Invention
The application provides a shale oil reservoir oiliness test method, and aims to solve the problem that in the prior art, the test of the oiliness saturation and the movable oil saturation of a shale core sample is inaccurate.
The technical scheme of the application is as follows:
a method for testing the oil content of a shale oil reservoir comprises the following steps:
A1. drilling a rock core of the shale oil reservoir to be used as a rock core sample, packaging a clean part of the rock core sample by using a preservative film, putting the rock core sample into a refrigerator, and performing to-be-detected measurement;
A2. weighing the core sample, wherein the weight obtained by weighing the core sample is recorded as G1, and the weight range of the obtained core sample is 20-150G;
A3. performing nuclear magnetic test on the core sample, and acquiring a nuclear magnetic spectrum of the nuclear magnetic pore volume of the core sample along with transverse relaxation time T2 to obtain the total pore volume Vt1 of the core sample;
A4. crushing the core sample subjected to nuclear magnetism measurement into particles, and performing dry distillation; gradually raising the temperature of the dry distillation device, and respectively recording the water yield and the oil yield of the core sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; the water yield of the core sample at 0-120 ℃ is movable water Vwm1, the water yield of the core sample at 120-315 ℃ is clay bound water Vwr1, and the water produced by the core sample at the temperature higher than 315 ℃ is mineral lattice water;
A5. and (3) carrying out data processing on the core sample: the oil saturation of the core sample is Soi1 ═ 1-Vwr1/Vt 1; the core sample has a mobile oil saturation of Som1 ═ Vom1/Vt1, wherein Vom1 ═ S1 XG 1/(1000 Xrho o), and S1 is the free hydrocarbon content of the core sample obtained by pyrolysis, G1 is the weight of the core sample, and rho o is the crude oil density; the lower limit of movable oil of the core sample is the transverse relaxation time T2 value corresponding to Vt1-Vom1 in the nuclear magnetic spectrum.
As one aspect of the present application, in step a1, the core sample includes a regular-shaped structure or an irregular-shaped structure.
As a technical scheme of the application, in step a1, the mud-containing portion of the core sample is removed, and the middle fresh portion of the core sample is packaged by a preservative film and then placed in a refrigerator, and sent to a laboratory for testing.
As one technical solution of the present application, in step a1, the refrigerator includes a freezer, and a temperature adjustment range of the freezer is-20 ℃ to 0 ℃.
As one solution of the present application, in step a2, the core sample is not washed with oil and is directly weighed.
As a technical solution of the present application, in step a3, the core sample is loaded into a nuclear magnetic sample barrel, and nuclear magnetic test parameters of a nuclear magnetic instrument are set, wherein an echo interval parameter of the nuclear magnetic instrument is set to 92 μ s, and a signal-to-noise ratio parameter is set to be greater than 16.
In step a4, the core sample with measured nuclear magnetism is crushed into particles with a particle size of less than 30 meshes, and the particles are filled into a retort and connected with a retort for retorting.
A method for testing the oil content of a shale oil reservoir comprises the following steps:
A1. drilling a rock core of a shale oil reservoir to serve as a core column sample, weighing the core column sample to obtain a weight G2, wherein the weight range of the obtained core column sample is 20-150G;
A2. performing nuclear magnetic test on the core column sample to obtain a nuclear magnetic spectrum of nuclear magnetic pore volume of the core column sample along with transverse relaxation time T2 to obtain total pore volume Vt2 of the core column sample; carrying out saturated oil operation after the core column sample is evacuated, and carrying out the nuclear magnetic test on the core column sample again to obtain the total pore volume Vt2 'of the core column sample, wherein the saturation recovery coefficient of the shale oil reservoir is Vt 2'/Vt 2;
A3. crushing the core pillar sample subjected to nuclear magnetism measurement into particles, and performing dry distillation; gradually raising the temperature of the dry distillation device, and respectively recording the water yield and the oil yield of the core pillar sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; the water yield of the core column sample at 0-120 ℃ is movable water Vwm2, the water yield of the core column sample at 120-315 ℃ is clay bound water Vwr2, and the water discharged by the core column sample at the temperature higher than 315 ℃ is mineral lattice water;
A5. and (3) carrying out data processing on the core column sample: the oil saturation of the core pillar sample is Soi2 ═ 1-Vwr2/Vt 2; the movable oil saturation Som2 of the core pillar sample is Vom2/Vt2, wherein Vom2 is S1 XG 2/(1000 Xrho o), S1 is the content of free hydrocarbon obtained by pyrolysis of a core sample at the same depth point with the core pillar sample, and G2 is the weight of the core pillar sample.
The beneficial effect of this application:
the application provides a method for testing the oil content of a shale oil reservoir, wherein a test sample in the method can be in any shape, sample drilling is not needed, and the sample can be rapidly and directly obtained on site; meanwhile, the test sample in the test method does not need oil washing, and the defects that the conventional sample for nuclear magnetism has long oil washing time (the oil washing time is saved by more than 15 days) and the sample is easy to crack when saturated water is used after oil washing are overcome; in addition, the test method adopts a nuclear magnetism-dry distillation combined test mode, and can directly measure the pore volume and the bound water volume by using the same sample, thereby overcoming the defect that the dry distillation sample cannot obtain the pore volume and needs another column sample to measure the pore volume and the defect that the nuclear magnetism method cannot obtain the bound water volume. The testing method can quickly and accurately obtain the oil saturation and the mobile fluid saturation of the shale oil reservoir core sample; meanwhile, the method is also suitable for testing and calculating the shale oil reservoir core sample under the condition of no freezing or the condition of light component volatilization, and the oil saturation and the movable fluid saturation of the shale oil reservoir core sample can be calculated by obtaining the accurate crude oil volume compensation recovery coefficient lost due to light hydrocarbon, so that the obtained oil saturation and movable fluid saturation of the shale oil reservoir core sample are more accurate and reliable.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a nuclear magnetic T2 spectrum of a clamshell oil 1 well core sample provided in a first embodiment of the present application;
fig. 2 is a schematic structural view of a retort apparatus according to a first embodiment of the present application.
Icon: 1-dry distillation device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Further, in the present application, unless expressly stated or limited otherwise, the first feature may be directly contacting the second feature or may be directly contacting the second feature, or the first and second features may be contacted with each other through another feature therebetween, not directly contacting the second feature. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The first embodiment:
referring to fig. 1 and fig. 2 in combination, an embodiment of the present application provides a method for testing oil content of a shale oil reservoir, which is used for testing the oil content of the shale oil reservoir, and the method is described in detail by taking a clam leaf oil 1 well in a Jianghan oil field as an example.
The method for testing the oil content of the shale oil reservoir mainly comprises the following steps:
A1. preparation of core samples: selecting a core of a target interval for sampling after the core of the clam leaf oil 1 well is taken out of the barrel, removing a mud-containing part of the core sample, packaging a middle fresh part of the core sample by using a preservative film, and putting the packaged middle fresh part into a refrigerator for refrigeration treatment, wherein the refrigeration treatment can effectively prevent light components in the core sample from volatilizing, and sending the refrigerated core sample to a laboratory for testing;
A2. weighing a core sample: washing the core sample without oil washing, and directly weighing; the weight obtained by weighing the core sample is recorded as G1, and the weight range of the obtained core sample is 20-150G;
A3. subjecting the core sample to nuclear magnetic testing: loading a core sample into a nuclear magnetic sample barrel, and setting nuclear magnetic testing parameters of a nuclear magnetic instrument, wherein the echo interval parameter of the nuclear magnetic instrument is set to be 92 mu s, and the signal-to-noise ratio parameter is set to be more than 16; thus, acquiring a nuclear magnetic spectrum of the nuclear magnetic pore volume of the core sample along with the transverse relaxation time T2 to obtain the total pore volume Vt1 (shown in figure 1) of the core sample;
A4. and (3) crushing the core sample subjected to nuclear magnetism measurement into particles, and performing dry distillation (shown in figure 2): crushing the core sample subjected to nuclear magnetism measurement into particles with the particle size smaller than 30 meshes, filling the particles into a dry distillation bottle, and connecting the dry distillation bottle with a dry distillation device 1 for dry distillation; gradually raising the temperature of the dry distillation device 1, and respectively recording the water yield and the oil yield of the core sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; wherein the water yield of the core sample at 0-120 ℃ is mobile water Vwm1, and for a shale oil layer, the core sample hardly contains the mobile water; the water yield of the core sample at 120-315 ℃ is clay bound water Vwr 1; the water produced by the core sample at the temperature of more than 315 ℃ is mineral lattice water, and binding water is not added;
A5. the core samples were subjected to data processing (processing results are shown in tables 1 and 2):
(1) the calculation process of the oil saturation of the rock core sample of the clam leaf oil 1 well comprises the following steps:
the oil porosity of the core sample was Voi1 ═ Vt1- (Vwm1+ Vwr 1); the oil saturation of the core sample is Soi1 ═ Voi1/Vt1, namely the oil saturation of the core sample is Soi1 ═ 1- (Vwm1+ Vwr1)/Vt 1; for shale oil, the shale oil contains almost no movable water, so that the movable water Vwm1 is 0; thus, the oil porosity of the core sample was Voi1 ═ Vt1-Vwr1, so the oil saturation of the core sample was Soi1 ═ 1-Vwr1/Vt 1.
(2) The calculation process of the movable oil saturation of the rock core sample of the clam leaf oil 1 well comprises the following steps:
the core sample had a mobile oil saturation of Som1 ═ Vom1/Vt1, where Vom1 ═ S1 × G1/(1000 × ρ o), and S1 was the free hydrocarbon content of the core sample obtained by pyrolysis, representing the free hydrocarbon content per volume of rock, in mg/G, G1 was the weight of the core sample, and ρ o was the crude oil density.
In the present example, the lower limit of the movable oil of the core sample is the transverse relaxation time T2 corresponding to Vt1-Vom1 in the nuclear magnetic spectrum.
Through the calculation, specific calculation results of the oil saturation and the movable oil saturation of the rock core sample of the clam-shell oil 1 well can be obtained, and the results in the tables 1 and 2 show that the testing method can quickly and accurately obtain the oil saturation and the movable fluid saturation of the shale oil reservoir rock core sample.
TABLE 1 Anodonta 1 well nuclear magnetism-dry distillation combined test data table
Table 2 table of movable oil saturation test data of freshly frozen core sample of clam leaf oil 1 well
It should be noted that, in this embodiment, in step a1, the core sample may be selected to be a regular-shaped structure or an irregular-shaped structure, that is, it may be an arbitrary-shaped structure.
In this embodiment, in step a1, the refrigerator may be a small portable freezer having a temperature control range of-20 ℃ to 0 ℃.
In this example, in step a2, the core sample may be weighed using an analytical balance with a sensitivity of 0.1 mg.
It should be noted that, in step a3, the nmr is a nmr of type GEOSPEIC5.12 in the prior art, or other types of nmr may be used, and the relaxation time is only 0.01 to 10000 milliseconds. In step a4, the dry distillation apparatus 1 may be a dry distillation apparatus of the prior art having a temperature range of 0 to 700 ℃.
Wherein, the nuclear magnetism test principle is: firstly, utilizing the characteristic that hydrogen nuclei (protons) in liquid (oil or water) rich in hydrogen atoms in pores of a core sample are charged and have spinning property, and using a static magnetic field (Z direction) to make the hydrogen protons in the pores align and rotate; then applying a radio frequency magnetic field perpendicular to the direction of the static magnetic field to the proton, inverting the rotation of the proton to an X-Y plane, absorbing energy to generate nuclear magnetic resonance, and then discharging redundant energy in a relaxation form, namely a signal to be measured by the nuclear magnetic resonance; therefore, the pore volume of the core sample is obtained by analyzing the change rule of the hydrogen proton signal intensity along with the relaxation time T2.
In this embodiment, the test procedure of the nuclear magnetic test is as follows: (1) starting a nuclear magnetic test instrument and stabilizing for 4 hours, (2) loading a fresh core sample or a saturated fluid core sample into a nuclear magnetic sample barrel, (3) starting test software of the nuclear magnetic test instrument, manually setting an echo interval and a signal-to-noise ratio of the test software, and starting a test, (4) obtaining a nuclear magnetic spectrogram of the pore volume of the core sample changing along with T2 through the test software.
It should be noted that fig. 1 shows a nmr spectrum of a clamshell oil 1 well core sample, where the abscissa of the graph is relaxation time (T2), the ordinate on the left side of the graph is incremental pore volume (incremental volume) at different relaxation times, and the ordinate on the right side of the graph is cumulative pore volume (cumulative volume) of the sample; the peak value T2(T2 peak) is a T2 value corresponding to the peak value of a nuclear magnetic spectrum, the mean value T2(T2 log mean) is an average T2 value of the nuclear magnetic spectrum, and the method can be used for core pore distribution characteristic research of the Anodon crassipes oil 1 well. It is worth mentioning that according to Vwr1 obtained by the clamshell oil 1 well core sample dry distillation method, a corresponding T2 value can be obtained through interpolation in the nuclear magnetic spectrogram, and the value can be used as a lower limit T2 cutoff value of the oil saturation of the clamshell oil 1 well core sample, so that the oil saturation oil is explained for nuclear magnetic logging.
In this example, in step a4, the test principle of the dry distillation method is as follows: the pores of the fresh core sample are filled with oil and water, and the distillation points of the oil and water are different, so that distillates at different temperatures can be obtained through heating and dry distillation step by step, and the water content of oil in the core sample is obtained.
In this embodiment, in step a4, the testing step is: (1) crushing the core sample into particles with the diameter of less than 6.4mm, weighing the particles, then loading the particles into a retort, (2) opening a condensation pipe connected with the retort, (1) gradually heating the condensation pipe according to the design temperature (generally 120-650 ℃), keeping the temperature point of the retort constant until the distillate is not produced in the core sample, and recording the liquid output of each distillate at each temperature, namely recording the water output and the oil output of the core sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃.
In this example, in step a5, the pyrolysis process thermolytic hydrocarbon test principle is: because the retained hydrocarbon molecules of different occurrence states of the shale layer have different molecular heat volatilization capacities, free hydrocarbons such as retained hydrocarbons occurring in cracks and macropores, hydrocarbons with light components and other compounds in relative adsorption states are easier to be released thermally, rock heat release and pyrolysis analysis can be carried out on the shale by setting different pyrolysis temperatures, the content of the hydrocarbons discharged by a core sample in the process of heat release and pyrolysis of carrier gas flow is detected by a hydrogen flame ionization detector, wherein the hydrocarbons discharged at 0-300 ℃ are free hydrocarbons S1, and the specific test process is executed according to the standard GB/T18062-2012.
In the present embodiment, the test sample in the test method is directly weighed without washing oil, so that the defects that the conventional sample for nuclear magnetism has a long oil washing time (the oil washing time is saved by more than 15 days), and the sample is easy to crack when being re-saturated with water after oil washing are overcome.
In addition, the test method is suitable for core samples with different shapes and structures, and the core samples in the test method should be fresh cores and need to be subjected to freezing treatment immediately after drilling.
In summary, the application provides a method for testing the oil content of the shale oil reservoir, the test sample in the method can be in any shape, sample drilling is not needed, and the sample can be rapidly and directly obtained from the site; meanwhile, the test sample in the test method does not need oil washing, and the defects that the conventional sample for nuclear magnetism has long oil washing time (the oil washing time is saved by more than 15 days) and the sample is easy to crack when saturated water is used after oil washing are overcome; in addition, the test method adopts a nuclear magnetism-dry distillation combined test mode, and can directly measure the pore volume and the bound water volume by using the same sample, thereby overcoming the defect that the dry distillation sample cannot obtain the pore volume and needs another column sample to measure the pore volume and the defect that the nuclear magnetism method cannot obtain the bound water volume. Therefore, the oil saturation and the movable fluid saturation of the shale oil reservoir core block sample can be rapidly and accurately obtained by the testing method.
Second embodiment:
the embodiment provides another shale oil reservoir oil content testing method which is mainly suitable for testing a columnar core with a regular shape, is also suitable for testing and calculating the shale oil reservoir columnar core under the condition of no freezing or the condition of light component volatilization, and can calculate the oil content saturation and the movable fluid saturation of the shale oil reservoir columnar core by obtaining the accurate crude oil volume compensation recovery coefficient lost due to light hydrocarbon, so that the obtained oil content saturation and the movable fluid saturation of the shale oil reservoir columnar core are more accurate and reliable.
The method for testing the oil content of the shale oil reservoir comprises the following steps:
A1. drilling a rock core of a shale oil reservoir to serve as a core column sample, weighing the core column sample to obtain a weight G2, wherein the weight range of the obtained core column sample is 20-150G;
A2. performing nuclear magnetic test on the core column sample to obtain a nuclear magnetic spectrum of nuclear magnetic pore volume of the core column sample along with transverse relaxation time T2 to obtain total pore volume Vt2 of the core column sample; carrying out saturated oil operation after the core column sample is evacuated, and carrying out the nuclear magnetic test on the core column sample again to obtain the total pore volume Vt2 'of the core column sample, wherein the saturation recovery coefficient of the shale oil reservoir is Vt 2'/Vt 2;
A3. crushing the core pillar sample subjected to nuclear magnetism measurement into particles, and performing dry distillation; gradually raising the temperature of the dry distillation device, and respectively recording the water yield and the oil yield of the core pillar sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; the water yield of the core column sample at 0-120 ℃ is movable water Vwm2, the water yield of the core column sample at 120-315 ℃ is clay bound water Vwr2, and the water discharged by the core column sample at the temperature higher than 315 ℃ is mineral lattice water;
A5. and (3) carrying out data processing on the core column sample: the oil saturation of the core pillar sample is Soi2 ═ 1-Vwr2/Vt 2; the movable oil saturation Som2 of the core pillar sample is Vom2/Vt2, wherein Vom2 is S1 XG 2/(1000 Xrho o), S1 is the content of free hydrocarbon obtained by pyrolysis of a core sample at the same depth point with the core pillar sample, and G2 is the weight of the core pillar sample.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The method for testing the oil content of the shale oil reservoir is characterized by comprising the following steps of:
A1. drilling a rock core of the shale oil reservoir to be used as a rock core sample, packaging a clean part of the rock core sample by using a preservative film, putting the rock core sample into a refrigerator, and performing to-be-detected measurement;
A2. weighing the core sample, wherein the weight obtained by weighing the core sample is recorded as G1, and the weight range of the obtained core sample is 20-150G;
A3. performing nuclear magnetic test on the core sample, and acquiring a nuclear magnetic spectrum of the nuclear magnetic pore volume of the core sample along with transverse relaxation time T2 to obtain the total pore volume Vt1 of the core sample;
A4. crushing the core sample subjected to nuclear magnetism measurement into particles, and performing dry distillation; gradually raising the temperature of the dry distillation device, and respectively recording the water yield and the oil yield of the core sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; the water yield of the core sample at 0-120 ℃ is movable water Vwm1, the water yield of the core sample at 120-315 ℃ is clay bound water Vwr1, and the water produced by the core sample at the temperature higher than 315 ℃ is mineral lattice water;
A5. and (3) carrying out data processing on the core sample: the oil saturation of the core sample is Soi1 ═ 1-Vwr1/Vt 1; the core sample has a mobile oil saturation of Som1 ═ Vom1/Vt1, where Vom1 ═ S1 XG 1/(1000 Xrho o), and S1 is the free hydrocarbon content of the core sample obtained by pyrolysis, G1 is the weight of the core sample, rhooIs the crude oil density; the lower limit of movable oil of the core sample is the transverse relaxation time T2 value corresponding to Vt1-Vom1 in the nuclear magnetic spectrum.
2. The shale reservoir oiliness testing method of claim 1, wherein in step a1, the core sample comprises a regular-shaped structure or an irregular-shaped structure.
3. The shale oil reservoir oiliness test method according to claim 1, wherein in step a1, the mud-containing part of the core sample is removed, and the middle fresh part of the core sample is packaged by a preservative film and then placed in a refrigerator, and sent to a laboratory for testing.
4. The shale oil reservoir oiliness test method of claim 1, wherein in step a1, the refrigerator comprises a freezer, and the temperature of the freezer is adjusted to be in the range of-20 ℃ to 0 ℃.
5. The shale reservoir oiliness test method of claim 1, wherein in step a2, the core sample is not washed and is directly weighed.
6. The method for testing the oil content of the shale oil reservoir as claimed in claim 1, wherein in step a3, the core sample is loaded into a nuclear magnetic sample barrel, and nuclear magnetic test parameters of a nuclear magnetic instrument are set, wherein the echo interval parameter of the nuclear magnetic instrument is set to 92 μ s, and the signal-to-noise ratio parameter is set to be greater than 16.
7. The method for testing the oil content of the shale oil reservoir as claimed in claim 1, wherein in step A4, the core sample after nuclear magnetism measurement is crushed into particles with the particle size less than 30 meshes, and the particles are filled into a retort and connected with a retort device for retort processing.
8. The method for testing the oil content of the shale oil reservoir is characterized by comprising the following steps of:
A1. drilling a rock core of a shale oil reservoir to serve as a core column sample, weighing the core column sample to obtain a weight G2, wherein the weight range of the obtained core column sample is 20-150G;
A2. performing nuclear magnetic test on the core column sample to obtain a nuclear magnetic spectrum of nuclear magnetic pore volume of the core column sample along with transverse relaxation time T2 to obtain total pore volume Vt2 of the core column sample; carrying out saturated oil operation after the core column sample is evacuated, and carrying out the nuclear magnetic test on the core column sample again to obtain the total pore volume Vt2 'of the core column sample, wherein the saturation recovery coefficient of the shale oil reservoir is Vt 2'/Vt 2;
A3. crushing the core pillar sample subjected to nuclear magnetism measurement into particles, and performing dry distillation; gradually raising the temperature of the dry distillation device, and respectively recording the water yield and the oil yield of the core pillar sample at 120 ℃, 170 ℃, 200 ℃, 315 ℃ and 650 ℃; the water yield of the core column sample at 0-120 ℃ is movable water Vwm2, the water yield of the core column sample at 120-315 ℃ is clay bound water Vwr2, and the water discharged by the core column sample at the temperature higher than 315 ℃ is mineral lattice water;
A5. and (3) carrying out data processing on the core column sample: the oil saturation of the core pillar sample is Soi2 ═ 1-Vwr2/Vt 2; the movable oil saturation Som2 of the core pillar sample is Vom2/Vt2, wherein Vom2 is S1 XG 2/(1000 Xrho o), S1 is the content of free hydrocarbon obtained by pyrolysis of a core sample at the same depth point with the core pillar sample, and G2 is the weight of the core pillar sample.
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