CN117571582A - Method for determining porosity occupied by light hydrocarbon and heavy hydrocarbon in shale oil reservoir - Google Patents
Method for determining porosity occupied by light hydrocarbon and heavy hydrocarbon in shale oil reservoir Download PDFInfo
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- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 285
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 285
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 264
- 239000003079 shale oil Substances 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 75
- 239000000843 powder Substances 0.000 claims abstract description 233
- 239000011435 rock Substances 0.000 claims abstract description 146
- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 21
- 238000002474 experimental method Methods 0.000 claims description 20
- 238000000197 pyrolysis Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 15
- 238000000944 Soxhlet extraction Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 12
- 238000011156 evaluation Methods 0.000 abstract description 4
- 239000001307 helium Substances 0.000 description 13
- 229910052734 helium Inorganic materials 0.000 description 13
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 10
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 9
- 229910052753 mercury Inorganic materials 0.000 description 9
- 238000005303 weighing Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000002459 porosimetry Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 235000011850 desserts Nutrition 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
Abstract
The application discloses a method for determining the porosity occupied by light hydrocarbon and heavy hydrocarbon in a shale oil reservoir, which comprises the following steps: acquiring a shale oil rock powder sample, and dividing the shale oil rock powder sample into a first part of powder sample and a second part of powder sample; determining an apparent density of the shale oil rock powder sample based on the first portion of the powder sample; determining a light hydrocarbon content and a heavy hydrocarbon content per gram shale oil rock powder sample based on the second portion of the powder sample; acquiring light hydrocarbon density and heavy hydrocarbon density of shale oil rock powder samples; calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density and the apparent density; the porosity occupied by the heavy hydrocarbon is calculated based on the heavy hydrocarbon content, the density of the heavy hydrocarbon, and the apparent density. Thus, the accurate calculation of the porosity occupied by the light hydrocarbon and the heavy hydrocarbon in the shale oil reservoir is realized. Plays an important role in subsequent shale oil reservoir evaluation.
Description
Technical Field
The application relates to the technical field of unconventional shale oil, in particular to a method for determining the porosity occupied by light hydrocarbon and heavy hydrocarbon in a shale oil reservoir.
Background
Porosity is one of the key parameters of shale oil reservoir evaluation, and it mainly characterizes the size of the reservoir space of shale oil systems. Under virgin formation conditions, the void space of shale oil reservoir rocks is filled with gaseous hydrocarbons, liquid hydrocarbons (light hydrocarbons, heavy hydrocarbons). However, the standard core column and the crushed shale sample or powder sample are tested by using a helium expansion method at present, only the porosity occupied by gaseous hydrocarbon can be measured, and the porosity occupied by light hydrocarbon and heavy hydrocarbon in liquid hydrocarbon cannot be measured. The light hydrocarbon in the liquid hydrocarbon is mostly free hydrocarbon/movable hydrocarbon, which determines the yield of shale oil; the heavy hydrocarbon is mostly adsorbed hydrocarbon, the heavy hydrocarbon is difficult to use in actual production, the total content of the light hydrocarbon and the heavy hydrocarbon is the oil content of shale oil, and the occupied pore space is the key for evaluating shale oil reservoirs, so that the method has important significance for optimizing shale oil resource desserts and constructing productivity. Thus, there is a need for a method of determining the porosity of light and heavy hydrocarbons in shale oil reservoirs.
Disclosure of Invention
In view of this, the present application provides a method for determining the porosity occupied by light hydrocarbon and heavy hydrocarbon in a shale oil reservoir, and the main purpose is to accurately calculate the porosity occupied by light hydrocarbon and heavy hydrocarbon in the shale oil reservoir.
According to one aspect of the application, there is provided a method for determining the porosity of light hydrocarbon and heavy hydrocarbon in a shale oil reservoir, the method comprising:
obtaining a shale oil rock powder sample, and dividing the shale oil rock powder sample to obtain a first part of powder sample and a second part of powder sample;
determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample;
obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on rock pyrolysis experiments to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder samples detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder samples detected at a second temperature;
obtaining a residual part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and performing Soxhlet extraction on the fourth part of powder samples for a preset period of time to obtain the fourth part of powder samples after oil washing;
obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing, wherein the third hydrocarbon content is detected at the second temperature, the first hydrocarbon content is used as light hydrocarbon content in each gram of shale oil rock powder samples, and the difference value between the second hydrocarbon content and the third hydrocarbon content is used as heavy hydrocarbon content in each gram of shale oil rock powder samples;
acquiring the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample;
calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density and the apparent density;
and calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
Optionally, the shale oil rock powder sample is an 80 mesh granule.
Optionally, the weight of the first portion of powder sample is greater than the weight of the second portion of powder sample.
Optionally, the obtaining a shale oil rock powder sample comprises:
collecting a fresh shale oil rock sample;
and grinding the fresh shale oil rock sample to obtain the shale oil rock powder sample.
Optionally, the obtaining the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample comprises:
obtaining fracturing oil density data of a corresponding acquisition site of the fresh shale oil rock sample, and determining a fracturing oil density average value according to the fracturing oil density data;
and determining the light hydrocarbon density and the heavy hydrocarbon density according to the average value of the fracturing oil density.
Optionally, the porosity occupied by the light hydrocarbon is calculated based on the following formula:
in the method, in the process of the invention,representing the porosity of the light hydrocarbon, +.>Indicating the light hydrocarbon content, i.e. the first hydrocarbon content, ">Representing light hydrocarbon density,/->Indicating apparent density.
Optionally, the porosity occupied by the heavy hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,represents the porosity of the heavy hydrocarbon, +.>Representing the heavy hydrocarbon content, i.e. the difference between the second hydrocarbon content and the third hydrocarbon content +.>Represents the density of heavy hydrocarbons,/->Indicating apparent density.
According to another aspect of the present application, there is provided a device for determining the porosity occupied by light hydrocarbons and heavy hydrocarbons in a shale oil reservoir, the device comprising:
the first acquisition module is used for acquiring shale oil rock powder samples and dividing the shale oil rock powder samples to obtain a first part of powder samples and a second part of powder samples;
a determination module for determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample;
the first testing module is used for obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on rock pyrolysis experiments to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder samples detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder samples detected at a second temperature;
the Soxhlet extraction module is used for obtaining the rest part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and carrying out Soxhlet extraction on the fourth part of powder samples for a preset period of time to obtain the fourth part of powder samples after oil washing;
the second testing module is used for obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing detected at the second temperature, taking the first hydrocarbon content as light hydrocarbon content in each gram of shale oil rock powder samples, and taking the difference value between the second hydrocarbon content and the third hydrocarbon content as heavy hydrocarbon content in each gram of shale oil rock powder samples;
a second acquisition module for acquiring a light hydrocarbon density of the shale oil rock powder sample and a heavy hydrocarbon density of the shale oil rock powder sample;
a first calculation module for calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density, and the apparent density;
and the second calculation module is used for calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
Optionally, the shale oil rock powder sample is an 80 mesh granule.
Optionally, the weight of the first portion of powder sample is greater than the weight of the second portion of powder sample.
Optionally, the first obtaining module is further configured to:
collecting a fresh shale oil rock sample;
and grinding the fresh shale oil rock sample to obtain the shale oil rock powder sample.
Optionally, the first acquisition module is further configured to;
obtaining fracturing oil density data of a corresponding acquisition site of the fresh shale oil rock sample, and determining a fracturing oil density average value according to the fracturing oil density data;
and determining the light hydrocarbon density and the heavy hydrocarbon density according to the average value of the fracturing oil density.
Optionally, the porosity occupied by the light hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,representing the porosity of the light hydrocarbon, +.>Indicating the light hydrocarbon content, i.e. the first hydrocarbon content, ">Representing light hydrocarbon density,/->Indicating apparent density.
Optionally, the porosity occupied by the heavy hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,represents the porosity of the heavy hydrocarbon, +.>Representing the heavy hydrocarbon content, i.e. the difference between the second hydrocarbon content and the third hydrocarbon content +.>Represents the density of heavy hydrocarbons,/->Indicating apparent density.
According to yet another aspect of the present application, there is provided a storage medium having stored thereon a computer program which when executed by a processor implements the above method of determining the porosity of light and heavy hydrocarbons in a shale oil reservoir.
According to a further aspect of the application, there is provided a computer device comprising a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, the processor implementing the method for determining the porosity of light hydrocarbon and heavy hydrocarbon in a shale oil reservoir when executing the program.
By means of the technical scheme, the method for determining the porosity occupied by the light hydrocarbon and the heavy hydrocarbon in the shale oil reservoir forms shale oil rock powder samples by grinding the obtained fresh shale oil rock samples into particles of 80 meshes. The shale oil rock powder sample is then split into two parts, a first part of the powder sample is used for determining the apparent density of the shale oil rock powder sample, and a second part of the powder sample is used for determining the light hydrocarbon content and the heavy hydrocarbon content in each gram of shale oil rock powder sample through rock pyrolysis experiments and Soxhlet extraction. Next, the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample are obtained. And finally, calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density and the apparent density, and calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density. Thus, the accurate calculation of the porosity occupied by the light hydrocarbon and the porosity occupied by the heavy hydrocarbon in the shale oil reservoir is realized. Plays an important role in subsequent shale oil reservoir evaluation.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a schematic flow chart of a method for determining the porosity of light hydrocarbon and heavy hydrocarbon in a shale oil reservoir according to an embodiment of the present application;
fig. 2 shows a schematic diagram of a shale oil rock powder sample detection flow provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for determining the porosity of light hydrocarbon and heavy hydrocarbon in a shale oil reservoir according to an embodiment of the present application;
fig. 4 shows a schematic device structure of a computer device according to an embodiment of the present application.
Detailed Description
The present application will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In this embodiment, a method for determining the porosity occupied by light hydrocarbon and heavy hydrocarbon in a shale oil reservoir is provided, as shown in fig. 1, and the method includes:
and 101, acquiring a shale oil rock powder sample, and dividing the shale oil rock powder sample to obtain a first part of powder sample and a second part of powder sample.
Optionally, step 101 includes: collecting a fresh shale oil rock sample; and grinding the fresh shale oil rock sample to obtain the shale oil rock powder sample.
Optionally, in step 101, the shale oil rock powder sample is 80 mesh particles.
Optionally, in step 101, the mass of the first portion of powder sample is greater than the mass of the second portion of powder sample.
In the embodiment of the application, after the fresh shale oil rock sample is collected, in order to eliminate the influence of the manually induced cracks in the drilling and sampling process, the fresh shale oil rock sample is ground into 80-mesh particles, so that the shale oil rock powder sample is obtained. And dividing the shale oil rock powder sample into two parts, wherein the first part of the powder sample is used for determining the apparent density of the shale oil rock powder sample. The second portion of the powder sample is used to determine the light hydrocarbon content and the heavy hydrocarbon content in the shale oil rock powder sample.
Step 102, determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample.
In this example, a first portion of the powder sample was taken and tested using helium expansion and mercury porosimetry to obtain the apparent density of the shale oil rock powder sample.
The first part of powder sample is taken, and the gas hydrogen in the shale oil reservoir can be calculated while the gas hydrogen in the shale oil reservoir occupies porosity by using a helium expansion method and a mercury injection method for testing. Specifically, the first portion of the powder sample is weighed using a balance, and then the first portion of the powder sample is tested using a helium expansion method to obtain the matrix volume of the first portion of the powder sample. Next, the matrix density of the shale oil rock powder sample is determined from the weight of the first portion of powder sample and the matrix volume of the first portion of powder sample, as follows:
；
in the method, in the process of the invention,represents matrix density,/-)>Weight (weight) is expressed in->Representing the matrix volume.
And then, testing the first part of powder sample subjected to the helium expansion test by using a mercury intrusion method to obtain the apparent density of the shale oil rock powder sample. And finally, determining the porosity occupied by gaseous hydrocarbon in the shale oil reservoir according to the matrix density and apparent density of the shale oil rock powder sample, wherein the determination formula is as follows:
in the method, in the process of the invention,represents the porosity of the gaseous hydrocarbon +.>Representation ofApparent density.
The testing process for testing the first part of powder sample by using a helium expansion method is carried out according to the national standard, namely the measurement of porosity by a shale helium method and permeability by a pulse attenuation method (GB/T34533-2017); the test procedure for testing the first part of powder sample after helium expansion test by mercury intrusion method, the pore size distribution and porosity of the solid material were determined according to the national standard mercury intrusion method and gas adsorption method, part 1: mercury porosimetry (GBT 21650.1-2008) was performed.
And 103, obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on a rock pyrolysis experiment to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder sample detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder sample detected at a second temperature.
In this example, the test procedure for testing the third portion of the powder sample was performed according to the national standard-rock pyrolysis analysis (GB/T18602-2012) based on rock pyrolysis experiments. Wherein the first temperature is 300 ℃, so the first hydrocarbon content is the hydrocarbon content in each gram of shale oil rock powder sample detected at 300 ℃, and the second temperature is > 300-600 ℃ or > 300-800 ℃, so the second hydrocarbon content is the hydrocarbon content in each gram of shale oil rock powder sample detected at > 300-600 ℃ or > 300-800 ℃.
And 104, obtaining the rest part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and performing Soxhlet extraction on the fourth part of powder samples for a preset duration to obtain the fourth part of powder samples after oil washing.
In this embodiment, the purpose of washing out the oil from the sample may be achieved by subjecting the fourth portion of the powder sample to a soxhlet extraction for a predetermined period of time, which may be 48 hours.
Step 105, obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, and testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing detected at the second temperature, wherein the first hydrocarbon content is used as light hydrocarbon content in each gram of shale oil rock powder samples, and the difference value between the second hydrocarbon content and the third hydrocarbon content is used as heavy hydrocarbon content in each gram of shale oil rock powder samples.
In this embodiment, the third hydrocarbon content is the hydrocarbon content in the shale oil rock powder sample after every gram of the washed oil detected at >300c to 600 ℃ or >300c to 800 ℃.
Step 106, obtaining the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample.
Optionally, step 106 includes: obtaining fracturing oil density data of a corresponding acquisition site of the fresh shale oil rock sample, and determining a fracturing oil density average value according to the fracturing oil density data; and determining the light hydrocarbon density and the heavy hydrocarbon density according to the average value of the fracturing oil density.
In the implementation, the fracturing oil density data is obtained by searching the fracturing oil density related data of the corresponding acquisition site of the fresh shale oil rock sample, and the average value of all the fracturing oil densities in the fracturing oil density data is calculated, so that the average value of the fracturing oil densities is approximately light hydrocarbon density and heavy hydrocarbon density.
Step 107, calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density and the apparent density.
Optionally, in step 107, the porosity occupied by the light hydrocarbon is calculated based on the following formula:
in the method, in the process of the invention,representing the porosity of the light hydrocarbon, +.>Indicating the light hydrocarbon content, i.e. the first hydrocarbon content, ">Representing light hydrocarbon density,/->Indicating apparent density.
Step 108, calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
Optionally, in step 108, the porosity of the heavy hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,represents the porosity of the heavy hydrocarbon, +.>Representing the heavy hydrocarbon content, i.e. the difference between the second hydrocarbon content and the third hydrocarbon content +.>Represents the density of heavy hydrocarbons,/->Indicating apparent density.
In summary, as shown in fig. 2, the method and the device realize accurate calculation of the porosity occupied by light hydrocarbon and the porosity occupied by heavy hydrocarbon in the shale oil reservoir, and can calculate the porosity occupied by gaseous hydrogen in the shale oil reservoir.
By applying the technical scheme of the embodiment, the shale oil rock powder sample is formed by grinding the obtained fresh shale oil rock sample into 80-mesh particles. The shale oil rock powder sample is then divided into two parts, the first part of the powder sample is used for determining the apparent density of the shale oil rock powder sample through a helium expansion method and a mercury injection method, the porosity occupied by gaseous hydrocarbon can be calculated while the apparent density is determined, and the second part of the powder sample is used for determining the light hydrocarbon content and the heavy hydrocarbon content in each gram of shale oil rock powder sample through a rock pyrolysis experiment and Soxhlet extraction. Next, the light hydrocarbon density and the heavy hydrocarbon density of the shale oil rock powder sample are determined by obtaining the frac oil density of the fresh shale oil rock sample collection site. Finally, the porosity occupied by the light hydrocarbon is calculated based on the light hydrocarbon content, the light hydrocarbon density, and the apparent density. The porosity occupied by the heavy hydrocarbon is calculated based on the heavy hydrocarbon content, the density of the heavy hydrocarbon, and the apparent density. Thus, the accurate calculation of the porosity occupied by the light hydrocarbon and the porosity occupied by the heavy hydrocarbon in the shale oil reservoir is realized. Plays an important role in subsequent shale oil reservoir evaluation.
The method for determining the porosity of light hydrocarbon and heavy hydrocarbon in the shale oil reservoir provided by the application is used for analyzing the samples (No. y1 and No. y 2) of the shale oil reservoir of the Huidos basin extension group, and comprises the following steps:
example 1:
(1) Fresh core sample number y1 was drilled using a well and a small piece of fresh sample was ground into 80 mesh particles, and the mass M of the particle sample was weighed using a balance 1 =18.5397g；
(2) Weighing a majority of the particles in step (1) by a balance 1 15.7649g, and then the matrix volume of the particle sample was measured by helium expansion=6.29cm3; calculating matrix density of the sample->2.51g/cm3；
(3) Testing the particle sample after helium expansion test by using a high-pressure mercury injection experiment to obtain the apparent density of the sample=2.44g/cm3；
(4) Calculation of the porosity of gaseous hydrocarbons=2.59%;
(5) Weighing the small part of the residual particle sample in the step (1) to obtain m 2 0.3285g for rock pyrolysis experiments, give S 1 =2.62mg/g，S 2 =14.59mg/g；
(6) Taking the residual particle sample in the step (5) to perform Soxhlet extraction for 48 hours;
(7) Weighing a small amount of particle samples after extracting washing oil 3 Rock pyrolysis experiment was performed again with = 0.3179g, yielding S 2ext =2.49mg/g；
(8) Obtaining the average value of the fracturing oil density of the sampling site to be approximately the density of light hydrocarbon and heavy hydrocarbon, and taking the value of 0.85g/cm 3 ；
(9) Calculating the porosity of light hydrocarbon=0.75%
(10) Calculation of the porosity occupied by heavy hydrocarbons=3.48%。
Example 2:
(1) Fresh core sample number y2 was drilled using a well and a small piece of fresh sample was ground into 80 mesh particles, and the mass M of the particle sample was weighed using a balance 2 =16.9462g；
(2) Weighing a majority of the particles in step (1) by a balance 1 15.0583g, and then the matrix volume of the particle sample was measured by helium expansion=6.49 cm3; calculating matrix density of the sample->2.32g/cm 3 ；
(3) Will be tested using high pressure mercury injectionTesting the particle sample after helium expansion method test to obtain apparent density of the sample=2.30g/cm 3 ；
(4) Calculation of the porosity of gaseous hydrocarbons=0.95%;
(5) Weighing the small part of the residual particle sample in the step (1) to obtain m 2 0.2937g for rock pyrolysis experiments, give S 1 =3.46mg/g，S 2 =30.68mg/g；
(6) Taking the residual particle sample in the step (5) to perform Soxhlet extraction for 48 hours;
(7) Weighing a small amount of particle samples after extracting washing oil 3 Rock pyrolysis experiment was performed again with = 0.3023g, yielding S 2ext =11.32mg/g；
(8) Obtaining the average value of the fracturing oil density of the sampling site to be approximately the density of light hydrocarbon and heavy hydrocarbon, and taking the value of 0.85g/cm 3 ；
(9) Calculating the porosity of light hydrocarbon=0.93%
(10) Calculation of the porosity occupied by heavy hydrocarbons=5.23%。
Further, as a specific implementation of the method of fig. 1, an embodiment of the present application provides a device for determining a porosity occupied by light hydrocarbon and heavy hydrocarbon in a shale oil reservoir, as shown in fig. 3, where the device includes:
the first acquisition module is used for acquiring shale oil rock powder samples and dividing the shale oil rock powder samples to obtain a first part of powder samples and a second part of powder samples;
a determination module for determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample;
the first testing module is used for obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on rock pyrolysis experiments to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder samples detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder samples detected at a second temperature;
the Soxhlet extraction module is used for obtaining the rest part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and carrying out Soxhlet extraction on the fourth part of powder samples for a preset period of time to obtain the fourth part of powder samples after oil washing;
the second testing module is used for obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing detected at the second temperature, taking the first hydrocarbon content as light hydrocarbon content in each gram of shale oil rock powder samples, and taking the difference value between the second hydrocarbon content and the third hydrocarbon content as heavy hydrocarbon content in each gram of shale oil rock powder samples;
a second acquisition module for acquiring a light hydrocarbon density of the shale oil rock powder sample and a heavy hydrocarbon density of the shale oil rock powder sample;
a first calculation module for calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density, and the apparent density;
and the second calculation module is used for calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
Optionally, the shale oil rock powder sample is an 80 mesh granule.
Optionally, the weight of the first portion of powder sample is greater than the weight of the second portion of powder sample.
Optionally, the first obtaining module is further configured to:
collecting a fresh shale oil rock sample;
and grinding the fresh shale oil rock sample to obtain the shale oil rock powder sample.
Optionally, the first acquisition module is further configured to;
obtaining fracturing oil density data of a corresponding acquisition site of the fresh shale oil rock sample, and determining a fracturing oil density average value according to the fracturing oil density data;
and determining the light hydrocarbon density and the heavy hydrocarbon density according to the average value of the fracturing oil density.
Optionally, the porosity occupied by the light hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,representing the porosity of the light hydrocarbon, +.>Representing the light hydrocarbon content, i.e. the first hydrocarbon content +.>Representing light hydrocarbon density,/->Indicating apparent density.
Optionally, the porosity occupied by the heavy hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,represents the porosity of the heavy hydrocarbon, +.>Representing the heavy hydrocarbon content, i.e. the difference between the second hydrocarbon content and the third hydrocarbon content +.>Represents the density of heavy hydrocarbons,/->Indicating apparent density.
It should be noted that, other corresponding descriptions of each functional unit related to the device for determining the porosity occupied by light hydrocarbon and heavy hydrocarbon in the shale oil reservoir provided in the embodiment of the present application may refer to corresponding descriptions in the method of fig. 1, and will not be described herein.
Based on the method shown in fig. 1, correspondingly, the embodiment of the application also provides a storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the method for determining the porosity of the shale oil reservoir shown in fig. 1, wherein the porosity is occupied by light hydrocarbon and heavy hydrocarbon.
The embodiment of the application also provides a computer device, which may be a personal computer, a server, a network device, etc., as shown in fig. 4, where the computer device includes a bus, a processor, a memory, a communication interface, and may further include an input/output interface and a display device. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing location information. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement the steps in the method embodiments.
Those skilled in the art will appreciate that the structures shown in FIG. 4 are block diagrams only and do not constitute a limitation of the computer device on which the present aspects apply, and that a particular computer device may include more or less components than those shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer readable storage medium is provided, which may be non-volatile or volatile, and on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile memory may include Read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high density embedded nonvolatile memory, resistive random access memory (ReRAM), magnetic random access memory (MagnetoresistiveRandomAccessMemory, MRAM), ferroelectric memory (FerroelectricRandomAccessMemory, FRAM), phase change memory (PhaseChangeMemory, PCM), graphene memory, and the like. Volatile memory may include random access memory (RandomAccessMemory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can take many forms, such as static random access memory (StaticRandomAccessMemory, SRAM) or dynamic random access memory (DynamicRandomAccessMemory, DRAM), among others. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method for determining the porosity of a shale oil reservoir for light hydrocarbons and heavy hydrocarbons, comprising:
obtaining a shale oil rock powder sample, and dividing the shale oil rock powder sample to obtain a first part of powder sample and a second part of powder sample;
determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample;
obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on rock pyrolysis experiments to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder samples detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder samples detected at a second temperature;
obtaining a residual part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and performing Soxhlet extraction on the fourth part of powder samples for a preset period of time to obtain the fourth part of powder samples after oil washing;
obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing, wherein the third hydrocarbon content is detected at the second temperature, the first hydrocarbon content is used as light hydrocarbon content in each gram of shale oil rock powder samples, and the difference value between the second hydrocarbon content and the third hydrocarbon content is used as heavy hydrocarbon content in each gram of shale oil rock powder samples;
acquiring the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample;
calculating the porosity occupied by the light hydrocarbon based on the light hydrocarbon content, the light hydrocarbon density and the apparent density;
and calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
2. The method of claim 1, wherein the shale oil rock powder sample is an 80 mesh particle.
3. The method of claim 1, wherein the weight of the first portion of powder sample is greater than the weight of the second portion of powder sample.
4. The method of claim 1, wherein the obtaining a shale oil rock powder sample comprises:
collecting a fresh shale oil rock sample;
and grinding the fresh shale oil rock sample to obtain the shale oil rock powder sample.
5. The method of claim 4, wherein the obtaining the light hydrocarbon density of the shale oil rock powder sample and the heavy hydrocarbon density of the shale oil rock powder sample comprises:
obtaining fracturing oil density data of a corresponding acquisition site of the fresh shale oil rock sample, and determining a fracturing oil density average value according to the fracturing oil density data;
and determining the light hydrocarbon density and the heavy hydrocarbon density according to the average value of the fracturing oil density.
6. The method of claim 1, wherein the porosity occupied by the light hydrocarbon is calculated based on the following formula:
in the method, in the process of the invention,representing the porosity of the light hydrocarbon, +.>Indicating the light hydrocarbon content, i.e. the first hydrocarbon content, ">Representing light hydrocarbon density,/->Indicating apparent density.
7. The method of claim 1, wherein the porosity occupied by the heavy hydrocarbon is calculated based on the following formula:
；
in the method, in the process of the invention,represents the porosity of the heavy hydrocarbon, +.>Representing the heavy hydrocarbon content, i.e. the difference between the second hydrocarbon content and the third hydrocarbon content,/->Represents the density of heavy hydrocarbons,/->Indicating apparent density.
8. A device for determining the porosity of a shale oil reservoir from light hydrocarbons to heavy hydrocarbons, the device comprising:
the first acquisition module is used for acquiring shale oil rock powder samples and dividing the shale oil rock powder samples to obtain a first part of powder samples and a second part of powder samples;
a determination module for determining an apparent density of the shale oil rock powder sample based on the first portion of powder sample;
the first testing module is used for obtaining a part of powder samples from the second part of powder samples to obtain a third part of powder samples, and testing the third part of powder samples based on rock pyrolysis experiments to respectively obtain a first hydrocarbon content in each gram of shale oil rock powder samples detected at a first temperature and a second hydrocarbon content in each gram of shale oil rock powder samples detected at a second temperature;
the Soxhlet extraction module is used for obtaining the rest part of powder samples in the second part of powder samples to obtain a fourth part of powder samples, and carrying out Soxhlet extraction on the fourth part of powder samples for a preset period of time to obtain the fourth part of powder samples after oil washing;
the second testing module is used for obtaining a part of powder samples from the fourth part of powder samples after oil washing to obtain a fifth part of powder samples, testing the fifth part of powder samples based on the rock pyrolysis experiment to obtain third hydrocarbon content in each gram of shale oil rock powder samples after oil washing detected at the second temperature, taking the first hydrocarbon content as light hydrocarbon content in each gram of shale oil rock powder samples, and taking the difference value between the second hydrocarbon content and the third hydrocarbon content as heavy hydrocarbon content in each gram of shale oil rock powder samples;
a second acquisition module for acquiring a light hydrocarbon density of the shale oil rock powder sample and a heavy hydrocarbon density of the shale oil rock powder sample;
a first calculation module for calculating the porosity occupied by the light hydrocarbon based on the content of the light hydrocarbon, the density of the light hydrocarbon, and the apparent density;
and the second calculation module is used for calculating the porosity occupied by the heavy hydrocarbon based on the heavy hydrocarbon content, the heavy hydrocarbon density and the apparent density.
9. A storage medium having stored thereon a computer program, which when executed by a processor, implements the method of any of claims 1 to 7.
10. A computer device comprising a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, characterized in that the processor implements the method of any one of claims 1 to 7 when executing the computer program.
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