CN114414433B - Method and equipment for judging crude oil density of reservoir based on hydrogen atom conservation - Google Patents
Method and equipment for judging crude oil density of reservoir based on hydrogen atom conservation Download PDFInfo
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- CN114414433B CN114414433B CN202210068923.5A CN202210068923A CN114414433B CN 114414433 B CN114414433 B CN 114414433B CN 202210068923 A CN202210068923 A CN 202210068923A CN 114414433 B CN114414433 B CN 114414433B
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Abstract
The embodiment of the specification discloses a method and equipment for judging the density of crude oil in a reservoir based on conservation of hydrogen atoms. Obtaining a rock sample comprising a pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample; determining an actual gas pressure value in the two-phase inclusion; and determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the pre-acquired density-pressure corresponding relation. By this scheme, the density of the initial crude oil can be directly given based on the pressure value of the gas contained in the two-phase inclusion in the rock sample, which is simpler and more effective.
Description
Technical Field
The present specification relates to the field of geochemistry, and more particularly to a method and apparatus for determining reservoir crude oil density based on conservation of hydrogen atoms.
Background
In crude oil pyrolysis gas reservoirs, if the crude oil in the reservoir is completely cracked in an earlier geological period, the original crude oil is not directly available, so that the properties of the crude oil can be studied only by other indirect means. Currently, the method for obtaining the density of crude oil in a reservoir is troublesome, and the density of crude oil before cracking cannot be directly obtained.
Based on this, a simple and effective solution for determining reservoir crude oil density is needed.
Disclosure of Invention
The invention aims to provide a simple and effective scheme for judging the density of crude oil in a reservoir based on conservation of hydrogen atoms.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, embodiments of the present disclosure provide a method of determining reservoir crude oil density based on hydrogen atom conservation, comprising: obtaining a rock sample comprising a pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample; determining an actual gas pressure value in the two-phase inclusion; and determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the pre-acquired density-pressure corresponding relation.
In a second aspect, embodiments of the present specification also provide a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method according to the first aspect when executing the program.
The above-mentioned at least one technical scheme that this description embodiment adopted can reach following beneficial effect:
compared with the prior art, the method has the advantages that the rock sample containing the cracking gas is obtained, wherein the cracking gas is generated based on crude oil cracking; acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample; determining an actual gas pressure value in the two-phase inclusion; and determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the pre-acquired density-pressure corresponding relation. By this scheme, the density of the initial crude oil can be directly given based on the pressure value of the gas contained in the two-phase inclusion in the rock sample, which is simpler and more effective.
Drawings
FIG. 1 is a schematic illustration of a crude oil cracking process according to an embodiment of the present disclosure;
FIG. 2 is an enlarged schematic view of a localized area in rock provided by an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of determining the density of crude oil in a reservoir based on conservation of hydrogen atoms according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of hardware of a computing device according to an embodiment of the application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present application based on the embodiments herein.
First, the principle of the scheme adopted in the present specification will be described. In particular, no convenient and efficient method has been found at present for indirectly obtaining crude oil properties of a pyrolysis gas reservoir. The crude oil cracking is a process of cracking large molecular crude oil into small molecular natural gas and asphalt, based on the mechanism of crude oil cracking.
In the process, hydrogen atoms in crude oil are continuously enriched into natural gas until cracking is finished, the hydrogen atoms are almost completely stored in the natural gas, asphalt is an aggregate of carbon elements, and the pressure of a closed system is mainly caused by the expansion of natural gas generated by the cracking of the crude oil, so that the pressure which can be generated at a specific temperature can be calculated as long as the amount and the volume of substances in the natural gas are known.
As far as present, since crude oils of different nature (such as light oil, medium oil, heavy oil and extra heavy oil) density, mass ratio of hydrogen atoms and density of cracked asphalt (which does not vary with the nature of crude oil at a given temperature, as it is eventually an aggregate of C and small amounts of heteroatoms) are known.
Meanwhile, since the fluid inclusion in the diagenetic mineral is a natural closed system. As shown in fig. 1, fig. 1 is a schematic diagram of a crude oil cracking process provided in the embodiment of the present disclosure, where the region a and the region c in fig. 1 are fluid inclusion combinations (fluid inclusion assemblages, FIA) generated under a closed system in rock, and evolve into two-phase natural gas-bitumen inclusion as in the region b and the region d in fig. 1 after cracking. To make this schematic clearer, the embodiment of the present disclosure further provides a partial enlarged schematic view of the a, b, c, and d regions in fig. 1, as shown in fig. 2, and fig. 2 is an enlarged schematic view of the partial region in the rock provided by the embodiment of the present disclosure.
Therefore, the scheme for judging the density of the crude oil in the reservoir based on the conservation of hydrogen atoms is provided, the corresponding relation (such as a functional relation or a corresponding numerical table and the like) of the density-pressure is firstly determined, and then the actual density of the crude oil can be directly inquired and obtained based on the comparison of the actual pressure value and the corresponding relation of the density-pressure.
In a first aspect, as shown in fig. 3, fig. 3 is a schematic flow chart for determining a crude oil density of a reservoir based on conservation of hydrogen atoms according to an embodiment of the present disclosure, which specifically includes:
s301, obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis.
In particular, rock samples in a desired investigation region fracture gas reservoir may be collected. Fluid inclusion sheets were then prepared and corresponding rock samples were obtained by reference to the rock tabletting method (Petroleum industry standard: SY/T5913-2004).
And S305, acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample.
In one embodiment, microscopic lithofacies observation of the rock sample may be used to find two-phase inclusions of natural gas-bitumen inclusion in the rock sample sheet.
For example, the specific process is that under a 50-times objective lens transmission light microscope, the fluid inclusion combination is taken as a research object, and a natural gas-asphalt two-phase inclusion (shown as b and d in fig. 1) formed by the cracking and evolution of a pure oil phase inclusion (shown as a and c in fig. 1) in the FIA is found and is defined.
S305, according to the volume V of the methane CH4 A pressure value P in the closed system is determined.
After the natural gas-asphalt two-phase inclusion (namely the b and d areas) is obtained, the laser Raman spectrum analysis test can be carried out on the natural gas-asphalt two-phase inclusion, and the Raman shift of methane at room temperature can be obtained. And finally, calculating the pressure value existing in the two-phase inclusion of the natural gas-asphalt through Raman displacement, wherein the pressure value is the actual gas pressure value in the two-phase inclusion, and specifically, the actual gas pressure value of methane in the two-phase inclusion.
S307, determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the pre-acquired density-pressure corresponding relation.
As described above, since the hydrogen element contained in the crude oil in any closed system is fixed, the mass and volume of methane generated after cracking are also known, and thus the density-pressure correspondence is relatively stable and measurable. Therefore, the actual density of the crude oil can be directly determined based on the density-pressure correspondence and the actual gas pressure value obtained in advance.
Compared with the prior art, the method has the advantages that the rock sample containing the cracking gas is obtained, wherein the cracking gas is generated based on crude oil cracking; acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample; determining an actual gas pressure value in the two-phase inclusion; and determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the pre-acquired density-pressure corresponding relation. By this scheme, the density of the initial crude oil can be directly given based on the pressure value of the gas contained in the two-phase inclusion in the rock sample, which is simpler and more effective.
Specifically, for the density-pressure correspondence relation referred to in the embodiments of the present specification, it may be determined based on the following procedure:
step 1: since crude oils of different properties (such as light oil, medium oil, heavy oil and extra heavy oil) density, mass ratio of hydrogen atoms and cracked asphalt density (which does not change with the change of crude oil properties at a given temperature, as it is eventually an aggregate of C and small amounts of heteroatoms) are known.
I.e. the density ρ of any crude oil can be assumed Oil (oil) At this time, the hydrogen atom mass ratio alpha in the crude oil H Can be obtained by inquiry.
Step 2, giving an arbitrary closed system, assuming a volume of V 0 At this time, the mass m of the crude oil in the closed system can be known Oil (oil) ＝ρ Oil (oil) *V 0 。
Step 3, after obtaining the mass of the crude oil in the closed system, obtaining the H atomic mass ratio alpha of the crude oil H The mass of H atoms in the inclusion is calculated by the formula m H =moil×α H Obtaining the mass m of H atoms H 。
Step 4, utilizingThe quantity of H atomic substances is obtained by H atomic mass through the following specific process of the formula n H ＝m H /M H Obtaining the number n of H atomic substances H Wherein M is H Is the mass of a single hydrogen atom.
Step 5, when the crude oil in the closed space is completely cracked, the gas produced by the crude oil is mostly methane, so that the amount of CH4 substances can be obtained by the mass amount of H element, specifically, the process is as follows, the formula n is adopted CH4 ＝n H /4, obtaining the number n of CH4 CH4 。
Step 6, by the amount n of CH4 species CH4 And molar mass M of CH4 CH4 The mass m of CH4 can be obtained CH4 Specifically, the method is as follows, through formula M CH4 *n CH4 ＝m CH4 。
Step 7, the crude oil in the closed system is calculated to be m Oil (oil) Since the addition and leakage of the substances do not occur during the cleavage process, the method is represented by the formula m Oil (oil) -m CH4 ＝m Asphalt The quality of the asphalt can be determined.
Step 8, the density of the solid asphalt produced by the pyrolysis in the closed system is constant at a given temperature, and therefore, the formula m can be used Asphalt /ρ Asphalt ＝V Asphalt Obtaining the volume V of asphalt Asphalt . Thereby also obtaining the volume V of the natural gas CH4 ＝V 0 -V Asphalt 。
Step 9, adopting a real gas state equation p=zn CH4 RT/V CH4 . (wherein R is molar gas constant, the value is 8.314472J/(mol.K), T is temperature, the specific value depends on the actual situation, and Z is the actual gas compression factor), the pressure value P of the internal pressure generated by cracking under the closed condition can be calculated.
Step 10, establishing the rho Oil (oil) And p as a set of samples (ρ Oil (oil) ，p)。
Step 11, traversing ρ of various densities Oil (oil) Generating a plurality of groups of samples, fitting the plurality of groups of samples to obtain density ρ Oil (oil) And a functional relationship or correspondence look-up table of pressure values P.
Correspondingly, in a second aspect, the embodiment of the present application further provides a computer device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method according to the first aspect when executing the program.
FIG. 4 illustrates a more specific hardware architecture diagram of a computing device provided by an embodiment of the application, which may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), microprocessor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present specification are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present description, and not all the components shown in the drawings.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the apparatus, device and medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and the relevant parts will be referred to in the description of the method embodiments, which is not repeated herein.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the apparatus, device and medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and the relevant parts will be referred to in the description of the method embodiments, which is not repeated herein.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps or modules recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Claims (4)
1. A method for determining reservoir crude oil density based on hydrogen atom conservation, comprising:
obtaining a rock sample comprising a pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis;
acquiring a natural gas-asphalt two-phase inclusion contained in the rock sample;
determining an actual gas pressure value in the two-phase inclusion;
determining the actual density of the crude oil according to the comparison of the actual gas pressure value and the density-pressure corresponding relation obtained in advance;
wherein, the density-pressure correspondence is obtained in advance based on the following manner: determination of the mass m of crude oil in a closed system Oil (oil) And density ρ Oil (oil) Wherein the volume of the closed system is V 0 The method comprises the steps of carrying out a first treatment on the surface of the Determining the density ρ Oil (oil) The hydrogen atom mass ratio alpha in the crude oil H The method comprises the steps of carrying out a first treatment on the surface of the According to the hydrogen atom mass ratio alpha H Determining and obtaining methane CH 4 Mass m of (2) CH4 The method comprises the steps of carrying out a first treatment on the surface of the Determining the volume V of bitumen in the closed system based on the mass of methane Asphalt And the volume V of the methane CH4 The method comprises the steps of carrying out a first treatment on the surface of the According to the volume V of the methane CH4 Determining a pressure value P in the closed system; according to the density ρ Oil (oil) And establishing a density-pressure correspondence with the pressure value P.
2. The method of claim 1, wherein obtaining a natural gas-bitumen two-phase inclusion contained in the rock sample comprises:
and acquiring a natural gas-asphalt two-phase inclusion formed by the cracking evolution of a pure oil phase inclusion in the fluid inclusion combination in the rock sample.
3. The method of claim 2, wherein determining the actual gas pressure value in the two-phase inclusion comprises:
carrying out laser Raman spectrum analysis and test on the two-phase inclusion to obtain the Raman shift of methane at room temperature;
and calculating the actual gas pressure value in the two-phase inclusion according to the Raman shift.
4. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1 to 3 when the program is executed by the processor.
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| CN104297432B (en) * | 2014-10-22 | 2016-05-11 | 中国石油天然气股份有限公司 | Method for determining deep crude oil pyrolysis gas resource amount |
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| CN113092734B (en) * | 2021-03-21 | 2023-05-26 | 中国石油大学(华东) | Identification method and equipment for in-situ cracking of crude oil in reservoir into gas |
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