CN114414433A - Method and equipment for determining reservoir crude oil density based on hydrogen atom conservation - Google Patents
Method and equipment for determining reservoir crude oil density based on hydrogen atom conservation Download PDFInfo
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Abstract
The embodiment of the specification discloses a method and equipment for determining reservoir crude oil density based on hydrogen atom conservation. Obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; obtaining natural gas-bitumen two-phase inclusions 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 between the actual gas pressure value and the density-pressure corresponding relation acquired in advance. Through the 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, and the method is simpler and more effective.
Description
Technical Field
The specification relates to the field of geochemistry, in particular to a method and equipment for determining reservoir crude oil density based on hydrogen atom conservation.
Background
In a crude oil cracked gas reservoir, the original crude oil is not directly available if the reservoir crude oil is completely cracked in an earlier geologic period, and thus the properties of the crude oil can only be studied by other indirect means. At present, the methods for obtaining the density of reservoir crude oil are troublesome, and the density of the crude oil before cracking cannot be directly obtained.
Based on this, a simple and effective scheme for determining the crude oil density of the reservoir is needed.
Disclosure of Invention
The invention aims to provide a simple and effective scheme for determining the density of reservoir crude oil based on hydrogen atom conservation.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, embodiments of the present description provide a method for determining reservoir crude oil density based on hydrogen atom conservation, comprising: obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; obtaining natural gas-bitumen two-phase inclusions 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 between the actual gas pressure value and the density-pressure corresponding relation acquired in advance.
In a second aspect, the present specification further provides 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 embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects:
compared with the prior art, the method comprises the steps of obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; obtaining natural gas-bitumen two-phase inclusions 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 between the actual gas pressure value and the density-pressure corresponding relation acquired in advance. Through the 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, and the method is simpler and more effective.
Drawings
FIG. 1 is a schematic diagram of a crude oil cracking process provided in the examples herein;
FIG. 2 is an enlarged schematic view of a localized region in rock provided by embodiments of the present description;
FIG. 3 is a schematic flow chart for determining the density of reservoir crude oil based on hydrogen atom conservation provided in the embodiments of the present disclosure;
fig. 4 is a schematic structural diagram of computing device hardware according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step are within the scope of the present application.
The principle of the scheme employed in this specification will be explained first. In particular, no simple and effective method has been found for indirectly obtaining the crude oil properties of a cracked gas reservoir at present. Based on the mechanism of crude oil cracking, crude oil cracking is a process of cracking large-molecular crude oil into small-molecular natural gas and asphalt.
In the process, hydrogen atoms in the crude oil are continuously enriched to the natural gas phase until cracking is finished, the hydrogen atoms are almost completely stored in the natural gas, and the asphalt is an aggregate of carbon elements.
At present, crude oil (such as light, medium, heavy and extra heavy oils) density, hydrogen atom mass ratio and cracked bitumen density (which does not change with the change in crude oil properties at a given temperature, and which ends up as an aggregate of C and small amounts of heteroatoms) are known due to different properties.
Meanwhile, the fluid inclusion developed 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 example of the present specification, and both areas a and c in fig. 1 are Fluid Inclusion Assemblies (FIAs) generated under a closed system in rock, and after cracking, they evolve into natural gas-bitumen two-phase inclusions in areas b and d in fig. 1. To make the schematic diagram clearer, the embodiment of the present specification further provides a partial enlarged schematic diagram of a, b, c and d regions in fig. 1, as shown in fig. 2, and fig. 2 is an enlarged schematic diagram of a partial region in rock provided by the embodiment of the present specification.
Therefore, the specification provides a scheme for determining the density of the reservoir crude oil based on hydrogen atom conservation, a density-pressure corresponding relation (such as a functional relation or a corresponding numerical table) is determined, and then the actual density of the crude oil can be directly inquired and obtained based on comparison between an actual pressure value and the density-pressure corresponding relation, so that the scheme is simple and effective.
In a first aspect, as shown in fig. 3, fig. 3 is a schematic flow chart for determining the reservoir crude oil density based on hydrogen atom conservation provided in an embodiment of the present specification, which specifically includes:
s301, obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis.
In particular, a rock sample in a pyrolysis gas reservoir in a desired area of investigation may be collected. Then making a fluid inclusion sheet, and making according to a rock sheet making method (oil industry standard: SY/T5913-2004) to obtain a corresponding rock sample.
S305, obtaining the natural gas-asphalt two-phase inclusion contained in the rock sample.
In one embodiment, the petrographic observation of the rock sample can be performed by using a microscope to find out the natural gas-asphalt inclusion two-phase inclusion in the rock sample slice.
For example, the specific process is to find natural gas-bitumen two-phase inclusion (as shown in areas b and d in fig. 1) formed by the pyrolysis evolution of pure oil phase inclusion (as shown in areas a and c in fig. 1) in FIA by using the fluid inclusion combination as a research object under a 50-fold objective lens transmission light microscope, and to define the natural gas-bitumen two-phase inclusion.
S305, according to the volume V of the methaneCH4Determining a pressure value P in the closed system.
After the natural gas-asphalt two-phase inclusion (namely, the b and d regions) is obtained, the natural gas-asphalt two-phase inclusion can be subjected to laser Raman spectrum analysis and test, and the Raman shift of methane at room temperature can be obtained. And finally, calculating a pressure value existing inside the natural gas-asphalt two-phase inclusion through Raman displacement, wherein the pressure value is an actual gas pressure value in the two-phase inclusion, and specifically is an actual gas pressure value of methane in the two-phase inclusion.
S307, comparing the actual gas pressure value with a pre-acquired density-pressure corresponding relation, and determining the actual density of the crude oil.
As mentioned above, for crude oil in any closed system, since the hydrogen element contained therein is fixed, the mass and volume of methane produced after cracking thereof are also known, and thus, the density-pressure relationship is relatively stable and measurable. Therefore, the actual density of the crude oil can be directly determined and obtained based on the density-pressure corresponding relation and the actual gas pressure value which are obtained in advance.
Compared with the prior art, the method comprises the steps of obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis; obtaining natural gas-bitumen two-phase inclusions 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 between the actual gas pressure value and the density-pressure corresponding relation acquired in advance. Through the 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, and the method is simpler and more effective.
Specifically, the density-pressure correspondence referred to in the embodiments of the present specification may be determined based on the following procedure:
step 1: it is known because of the density of crude oils of different nature (such as light, medium, heavy and extra heavy oils), the mass fraction of hydrogen atoms and the density of cracked pitch (which does not vary with the nature of the crude oil at a given temperature, since it ends up as a collection of C and a small number of heteroatoms).
I.e. the density ρ of any crude oil can be assumedOilAt this time, the hydrogen atom mass ratio in the crude oil is αHCan be queried.
Step 2, an arbitrary closed system is given, and the volume is assumed to be V0At this time, the mass m of the medium crude oil in the closed system can be knownOil＝ρOil*V0。
Step 3, obtaining the quality of the crude oil in the closed system, and then obtaining the H atom mass ratio alpha of the known crude oilHCalculating the mass of H atoms in the inclusion by the formula mHα ═ m oilHObtaining the mass m of H atomsH。
Step 4, obtaining the quantity of the H atomic substances by utilizing the mass of the H atoms through a formula nH＝mH/MHObtaining the number n of H atom speciesHWherein M isHIs the mass of a single hydrogen atom.
Step 5, when the crude oil in the closed space is completely cracked, the generated gas is mostly methane, so the mass amount of CH4 substance can be obtained through the mass amount of H element by the specific process of the formula nCH4＝nH/4, the number n of CH4 is obtainedCH4。
Step 6, passing the number n of CH4 substancesCH4And the molar mass M of CH4CH4The mass m of CH4 can be obtainedCH4The specific process is that the formula M is usedCH4*nCH4＝mCH4。
Step 7, calculating the crude oil in the closed system to obtain mOilSince no addition or leakage of substances occurs during the cracking process, the formula m is usedOil-mCH4＝mAsphaltThe quality of the bitumen can be determined.
Step 8, the solid pitch produced by cracking in the closed systemThe degree is constant at a given temperature, and therefore, the formula m can be usedAsphalt/ρAsphalt＝VAsphaltObtaining the volume V of the asphaltAsphalt. Thereby also obtaining the volume V of the natural gasCH4＝V0-VAsphalt。
Step 9, adopting a real gas state equation P ═ ZnCH4RT/VCH4. (wherein, R is a molar gas constant, and has a value of 8.314472J/(mol. K), T is temperature, and has a unit of Kelvin, and the specific value depends on the actual situation, and Z is a real 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 rhoOilAnd p as a set of samples (p)Oil，p)。
Step 11, traversing rho of various densitiesOilGenerating a plurality of sets of samples, and fitting the plurality of sets of samples to obtain a density rhoOilAnd a lookup table of functional or corresponding relationships to the pressure value P.
Correspondingly, in a second aspect, the present application further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to the first aspect when executing the program.
Fig. 4 is a schematic diagram illustrating a more specific hardware structure of a computing device according to an embodiment of the present application, where the computing device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.
The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present apparatus and other apparatuses. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).
It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Especially, as for the device, apparatus and medium type embodiments, since they are basically similar to the method embodiments, the description is simple, and the related points may refer to part of the description of the method embodiments, which is not repeated here.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Especially, as for the device, apparatus and medium type embodiments, since they are basically similar to the method embodiments, the description is simple, and the related points may refer to part of the description of the method embodiments, which is not repeated here.
The foregoing description has been directed to specific embodiments of this 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 may also be possible or may be advantageous.
Claims (5)
1. A method for determining the density of reservoir crude oil based on hydrogen atom conservation comprises the following steps:
obtaining a rock sample containing pyrolysis gas, wherein the pyrolysis gas is generated based on crude oil pyrolysis;
obtaining natural gas-bitumen two-phase inclusions 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 between the actual gas pressure value and the density-pressure corresponding relation acquired in advance.
2. The method according to claim 1, wherein the density-pressure correspondence is acquired in advance based on:
determination of the Mass m of Medium crude oil in a closed SystemOilAnd density ρOilWherein the volume of the closed system is V0；
Determining at the density pOilThe mass ratio of hydrogen atoms in the crude oil of (2) to alphaH；
According to the mass ratio alpha of the hydrogen atomsHDetermination of methane CH4Mass m ofCH4；
Determining the volume V of the bitumen in the closed system according to the mass of the methaneAsphaltAnd the volume V of said methaneCH4；
According to the volume V of the methaneCH4Determining a pressure value P in the closed system;
according to the density pOilAnd establishing a density-pressure corresponding relation with the pressure value P.
3. The method of claim 1, wherein obtaining the natural gas-bitumen two-phase inclusion contained in the rock sample comprises:
and acquiring natural gas-asphalt two-phase inclusion formed by pyrolysis evolution of pure oil phase inclusion in the fluid inclusion combination in the rock sample.
4. The method of claim 3, wherein determining an actual gas pressure value in the two-phase inclusion comprises:
performing laser Raman spectrum analysis and test on the two-phase inclusion to obtain Raman shift of methane at room temperature;
and calculating the actual gas pressure value in the two-phase inclusion according to the Raman displacement.
5. 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 4 when executing the program.
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