CN107795319A - Method and device for acquiring oil reservoir geological reserves with gravity differentiation phenomenon - Google Patents
Method and device for acquiring oil reservoir geological reserves with gravity differentiation phenomenon Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000005484 gravity Effects 0.000 title claims abstract description 28
- 230000004069 differentiation Effects 0.000 title claims abstract description 27
- 239000010779 crude oil Substances 0.000 claims abstract description 302
- 239000003921 oil Substances 0.000 claims abstract description 152
- 238000012545 processing Methods 0.000 claims description 45
- 238000011161 development Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
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- 238000002474 experimental method Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000012417 linear regression Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention provides a method and a device for acquiring oil reservoir geological reserves with a gravity differentiation phenomenon, and belongs to the technical field of oil exploration and development. The method for acquiring the geological reserves of the oil reservoirs with the gravity differentiation phenomenon comprises the following steps: acquiring preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and crude oil volume coefficient of the subarea; and acquiring the unit crude oil geological reserve of the volume of the preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2. The method and the device for acquiring the oil reservoir geological reserve with the gravity differentiation phenomenon improve the accuracy of the crude oil geological reserve.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and development, in particular to a method and a device for acquiring oil reservoir geological reserves with a gravity differentiation phenomenon.
Background
Generally, crude oil is stored in a liquid state in deep underground, and when the crude oil is produced to the surface, natural gas dissolved in the liquid crude oil is separated due to a low pressure at the surface, and the separated natural gas is called solution gas.
In the prior art, for a crude oil reservoir with small amplitude and oil column height, the natural gas amount separated from underground crude oil at different positions of the oil reservoir is almost equal, and the density of the ground crude oil is basically the same. Thus, crude oil geological reserves can be calculated according to petroleum industry standards (which are generally applicable only to crude oil reservoirs of small amplitude and column height). However, for a crude oil reservoir with large amplitude and large oil column height, because the crude oil reservoir is obvious under the action of gravity, the deeper the crude oil reservoir is, the smaller the corresponding volume coefficient of the original crude oil is, and the smaller the original dissolved gas-oil ratio is, the higher the crude oil density is; conversely, the shallower the burial depth, the larger the corresponding volume coefficient of the original crude oil, the larger the original dissolved gas-oil ratio, and the lower the crude oil density. The crude oil geological reserves, if calculated again according to industry standards, can result in large errors in the crude oil geological reserves.
However, the accuracy of crude oil geological reserves in the prior art is not high.
Disclosure of Invention
The invention provides a method and a device for acquiring oil reservoir geological reserves with gravity differentiation phenomena, which are used for improving the accuracy of the crude oil geological reserves.
The embodiment of the invention provides a method for acquiring the geological reserve of an oil reservoir with a gravity differentiation phenomenon, which comprises the following steps:
acquiring preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and crude oil volume coefficient of the subarea;
and acquiring the unit crude oil geological reserve of the volume of a preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2.
In an embodiment of the present invention, the obtaining the geological reserves of crude oil in unit of the preset region volume according to the preset parameters of the N sub-regions includes:
acquiring the average original crude oil volume coefficient of the preset region according to the preset parameters of the N sub-regions;
and acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area.
In an embodiment of the present invention, the preset parameter of the sub-region further includes an original dissolved gas-oil ratio of the sub-region;
after acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area, the method further comprises the following steps:
acquiring the original dissolved gas-oil ratio of the N sub-regions;
and acquiring the dissolved gas geological reserves of the unit volume of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
In an embodiment of the present invention, the obtaining the dissolved gas geological reserves of the preset region volume unit according to the preset parameters of the N sub-regions and the crude oil geological reserves of the preset region volume unit includes:
acquiring the average original dissolved gas-oil ratio of the preset area according to preset parameters of the N sub-areas;
and acquiring the dissolved gas geological reserve of the preset area volume unit according to the average original dissolved gas-oil ratio of the preset area and the crude oil geological reserve of the preset area volume unit.
In an embodiment of the present invention, the preset parameters of the sub-region further include the crude oil density of the sub-region;
after acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area, the method further comprises the following steps:
acquiring the crude oil density of the N sub-regions;
and acquiring the unit crude oil geological reserves of the mass of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
In an embodiment of the present invention, the obtaining the unit crude oil geological reserves of the preset region quality according to the crude oil densities of the N sub-regions and the unit crude oil geological reserves of the preset region volume includes:
acquiring the average crude oil density of the preset area according to preset parameters of the N sub-areas;
and acquiring the unit crude oil geological reserve of the mass of the preset area according to the average crude oil density of the preset area and the unit crude oil geological reserve of the volume of the preset area.
In an embodiment of the present invention, the obtaining the average original crude oil volume coefficient of the preset region according to the preset parameters of the N sub-regions includes:
according toObtaining the average original crude oil volume coefficient of the preset area;
wherein,representing the mean original crude oil volume coefficient, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
In an embodiment of the present invention, the obtaining the geological reserves of crude oil in unit volume of the preset region according to the average original crude oil volume coefficient of the preset region includes:
according toAcquiring the geological reserves of crude oil in unit of the volume of the preset area;
wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,and N represents the unit crude oil geological reserve of the volume of the preset area.
In an embodiment of the present invention, the obtaining, according to the preset parameters of the N sub-regions, an average original dissolved gas-oil ratio of the preset region includes:
according toObtaining the average original dissolved gas-oil ratio of the preset area;
wherein,representing the average original dissolved gas-oil ratio, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresenting the i-th sub-zone dissolved gas-oil ratio.
In an embodiment of the present invention, the obtaining the dissolved gas geological reserves per unit volume of the preset area according to the average original dissolved gas-oil ratio of the preset area and the geological reserves per unit volume of the preset area includes:
according toObtaining the dissolved gas geological reserve of the preset area volume unit;
wherein G represents the dissolved gas geological reserve per volume unit of the preset area.
In an embodiment of the present invention, the obtaining the average crude oil density of the preset region according to the preset parameters of the N sub-regions includes:
according toAcquiring the average crude oil density of the preset area;
wherein,representing the average crude oil density, A, of said predetermined areaiDenotes the oil-containing area, h, of the ith sub-regioniRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
In an embodiment of the present invention, the obtaining the unit crude oil geological reserves of the preset area quality according to the average crude oil density of the preset area and the unit crude oil geological reserves of the preset area volume includes:
according toAcquiring the geological reserves of crude oil of the preset area quality unit;
wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
The embodiment of the invention also provides a device for acquiring the geological reserve of the oil reservoir with the gravity differentiation phenomenon, which comprises the following components:
the acquisition module is used for acquiring preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and a crude oil volume coefficient of the subarea;
and the processing module is used for acquiring the unit crude oil geological reserves of the volume of a preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2.
In an embodiment of the present invention, the processing module is specifically configured to obtain an average original crude oil volume coefficient of the preset region according to preset parameters of the N sub-regions;
the processing module is specifically used for obtaining the geological reserves of crude oil in unit volume of the preset area according to the average original crude oil volume coefficient of the preset area.
In an embodiment of the present invention, the preset parameter of the sub-region further includes an original dissolved gas-oil ratio of the sub-region;
the acquisition module is further used for acquiring the original dissolved gas-oil ratio of the N sub-regions;
and the processing module is also used for acquiring the dissolved gas geological reserves of the unit volume of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
In an embodiment of the present invention, the processing module is specifically configured to obtain an average original dissolved gas-oil ratio of the preset region according to preset parameters of the N sub-regions;
the processing module is specifically used for obtaining the dissolved gas geological reserves of the preset area volume unit according to the average original dissolved gas-oil ratio of the preset area and the crude oil geological reserves of the preset area volume unit.
In an embodiment of the present invention, the preset parameters of the sub-region further include the crude oil density of the sub-region;
the acquisition module is further used for acquiring the crude oil density of the N sub-regions;
and the processing module is also used for acquiring the unit crude oil geological reserves of the mass of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
In an embodiment of the present invention, the processing module is specifically configured to obtain an average crude oil density of the preset region according to preset parameters of the N sub-regions;
the processing module is specifically used for obtaining the unit crude oil geological reserves of the mass of the preset area according to the average crude oil density of the preset area and the unit crude oil geological reserves of the volume of the preset area.
In an embodiment of the present invention, the processing module is specifically configured toObtaining the average original crude oil volume coefficient of the preset area;
wherein,representing the mean original crude oil volume coefficient, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiIndicating the ith sub-area effective apertureDegree of play, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
In an embodiment of the present invention, the processing module is specifically configured toAcquiring the geological reserves of crude oil in unit of the volume of the preset area;
wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,and N represents the unit crude oil geological reserve of the volume of the preset area.
In an embodiment of the present invention, the processing module is specifically configured toObtaining the average original dissolved gas-oil ratio of the preset area;
wherein,representing the average original dissolved gas-oil ratio, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresents the dissolved gas-oil ratio of the ith sub-zone.
In an embodiment of the present invention, the processing module is specifically configured toObtaining the dissolved gas geological reserve of the preset area volume unit;
wherein G represents the dissolved gas geological reserve per volume unit of the preset area.
In an embodiment of the present invention, the processing module is specifically configured toAcquiring the average crude oil density of the preset area;
wherein,representing the average crude oil density, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
In an embodiment of the present invention, the processing module is specifically configured toAcquiring the geological reserves of crude oil of the preset area quality unit;
wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
According to the method for acquiring the crude oil geological reserve, the preset parameters of N sub-regions are acquired; and acquiring the unit crude oil geological reserve of the volume of the preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2. Therefore, when the unit crude oil geological reserve of the preset region volume is calculated, the preset region is divided into N sub-regions, and the unit crude oil geological reserve of the preset region volume is calculated according to preset parameters of the N sub-regions, so that the accuracy of the crude oil geological reserve is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a first embodiment of a method for obtaining a geological reserve of an oil reservoir having a gravity differentiation phenomenon according to the present invention;
FIG. 2 is a flow chart of a second method for obtaining the geological reserves of an oil reservoir with gravity differentiation according to the present invention;
fig. 3 is a schematic structural diagram of a first embodiment of the oil reservoir geological reserve acquisition device with gravity differentiation.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
At present, in the process of calculating the geological reserves of the crude oil and the dissolved gas, values of relevant parameters are generally taken according to industrial standards, so that the obtained geological reserves of the crude oil and the dissolved gas have large errors. The method for acquiring the geological reserves of the oil reservoir with the gravity differentiation phenomenon can improve the accuracy of the geological reserves of the crude oil and the dissolved gas. Hereinafter, the technical means of the present application will be described in detail by way of specific examples.
It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a flowchart of a first embodiment of the method for acquiring a geological reserve of an oil reservoir with a gravity differentiation phenomenon according to the present invention, where the method may be performed by an oil reservoir geological reserve acquisition device with a gravity differentiation phenomenon, and optionally, the oil reservoir geological reserve acquisition device with a gravity differentiation phenomenon may be independently installed or may be integrated in a processor. As shown in fig. 1, the method for acquiring the geological reserves of the oil reservoir with the gravity differentiation phenomenon may include:
s101, acquiring preset parameters of the N sub-regions.
Wherein N is an integer of 2 or more. The preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and a crude oil volume coefficient of the subarea. In the embodiment of the invention, the net-to-gross ratio model, the porosity model and the oil saturation model can be obtained through logging data, after the three models are obtained, the effective thickness of each sub-region can be obtained according to the thickness of each sub-region and the net-to-gross ratio model, the effective porosity of the sub-region can be obtained according to the porosity model, and the oil saturation of the sub-region can be obtained according to the oil saturation model.
When the crude oil volume coefficient of the sub-area is obtained, crude oil fluid samples under various measuring points can be obtained through testing of one or more well modular dynamic testers in the original state of crude oil, then the crude oil volume coefficient of each sample is obtained through an indoor high-pressure physical property experiment, and linear regression is carried out on the crude oil volume coefficient and the altitude depth of the measuring points, so that a linear relation between the crude oil volume coefficient and the altitude is obtained. When a geological reserve of a certain crude oil is obtained, the altitude of the crude oil can be substituted into the linear relational expression, so that the volume coefficient of the crude oil is obtained.
S102, acquiring the unit crude oil geological reserves of the volume of the preset region according to the preset parameters of the N sub-regions.
The preset area is divided into N sub-areas. Optionally, the preset region may be divided into N sub-regions on average, or the preset region may be divided into N unequal sub-regions, where how to divide the preset region is not specifically limited in the present invention.
In general, the preset region is divided into N sub-regions, each sub-region can be regarded as a grid, and the smaller the size of the grid is, the more accurate the value of the crude oil geological reserve is. In this embodiment, the length of each grid may be less than or equal to 50 meters, the width of each grid may be less than or equal to 50 meters, and the height of each grid may be less than or equal to 5 meters, which may be other values, and the present invention is not limited specifically herein.
In the embodiment of the invention, in order to improve the accuracy of the unit crude oil geological reserve of the preset area volume, the preset area can be firstly subjected to gridding treatment, so that the preset area is divided into N sub-areas, and then the unit crude oil geological reserve of the preset area volume is calculated through the preset parameters of the N sub-areas.
According to the method for acquiring the geological reserve of the oil reservoir with the gravity differentiation phenomenon, which is provided by the embodiment of the invention, the preset parameters of N sub-regions are acquired; and acquiring the unit crude oil geological reserve of the volume of the preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2. Therefore, when the unit crude oil geological reserve of the volume of the preset area is calculated, the preset area is divided into N sub-areas, and the unit crude oil geological reserve of the volume of the preset area is calculated according to preset parameters of the N sub-areas, so that the accuracy of the crude oil geological reserve is improved.
Based on the embodiment corresponding to fig. 1, on the basis of the embodiment corresponding to fig. 1, further, another method for acquiring the geological reserve of an oil reservoir with a gravity differentiation phenomenon is provided in the embodiment of the present invention, please refer to fig. 2, where fig. 2 is a flowchart of a second embodiment of the method for acquiring the geological reserve of an oil reservoir with a gravity differentiation phenomenon of the present invention, and the method for acquiring the geological reserve of an oil reservoir with a gravity differentiation phenomenon further includes:
optionally, the step S102 of obtaining the unit crude oil geological reserve of the preset region volume according to the preset parameters of the N sub-regions includes:
and S1021, acquiring the average original crude oil volume coefficient of the preset area according to the preset parameters of the N sub-areas.
Optionally, the average original crude oil volume coefficient of the preset area can be obtained;
wherein,mean original crude oil volume coefficient, A, representing a predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
According to the formula I, when the average original crude oil volume coefficient of the preset region is obtained, the weighted average can be carried out on each sub-region of the N sub-regions, so that the average original crude oil volume coefficient of the preset region is obtained, and the accuracy of the average original crude oil volume coefficient of the preset region is improved.
After the relatively accurate average original crude oil volume coefficient of the preset area is obtained, the geological reserves of crude oil in unit volume of the preset area can be obtained through the step S1022.
And S1022, acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area.
Optionally, the geological reserves of crude oil in unit of the volume of the preset area can be obtained according to the following formula II;
wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,and N represents the unit crude oil geological reserve of the volume of the preset area.
The oil-containing areas of the N sub-regions can be accumulated and summed to obtain the oil-containing area of the preset region; the effective thicknesses of the N sub-regions in the preset region can be weighted and averaged, so that the average effective thickness of the preset region is obtained; similarly, the effective porosity of the N sub-regions in the preset region may be weighted and averaged, so as to obtain the average effective porosity of the preset region; and carrying out weighted average on the oil saturation of the N sub-regions in the preset region so as to obtain the average oil saturation of the preset region.
It can be seen from the above second formula that, when the unit crude oil geological reserve of the preset area volume is obtained, the average original crude oil volume coefficient of the preset area in the step S1021 is obtained, and because the accuracy of the average original crude oil volume coefficient of the preset area is higher, the accuracy of the unit crude oil geological reserve of the preset area volume obtained by the second formula is higher, that is, the accuracy of the unit crude oil geological reserve of the preset area volume is improved.
Furthermore, the method for acquiring the crude oil geological reserves provided by the invention can not only improve the accuracy of the crude oil geological reserves in the unit volume of the preset area, but also further improve the accuracy of the dissolved gas geological reserves in the unit volume of the preset area. In an example, in the process of obtaining the dissolved gas geological reserve of the preset area volume unit, the method may further include: the preset parameters of the sub-zone also include the original dissolved gas-oil ratio of the sub-zone.
Step S102, after acquiring the unit crude oil geological reserve of the preset area volume according to the average original crude oil volume coefficient of the preset area, the method can further comprise the following steps:
s103, acquiring the original dissolved gas-oil ratio of the N sub-regions.
When the original dissolved gas-oil ratio of the sub-area is obtained, a crude oil fluid sample under each measuring point can be obtained through one or more well modular dynamic testers in the original state of crude oil, then the original dissolved gas-oil ratio of each sample is obtained through an indoor high-pressure physical property experiment, and linear regression is carried out on the original dissolved gas-oil ratio and the altitude depth of the measuring point, so that a linear relation between the original dissolved gas-oil ratio and the altitude is obtained. When a geological reserve of a certain crude oil is obtained, the altitude of the crude oil can be substituted into the linear relation, so that the original dissolved gas-oil ratio is obtained.
Alternatively, step S103 may be executed after step S102, before step S102, or, of course, may also be executed simultaneously with step S102, and here, this embodiment is described only by way of example that step S103 may be executed after step S102, and does not represent that the present invention is limited thereto.
After the original dissolved gas-oil ratios of the N sub-regions are obtained, the dissolved gas geological reserves per unit volume of the preset region may be obtained through the following step S104.
S104, obtaining the dissolved gas geological reserves of the preset area volume unit according to the preset parameters of the N sub-areas and the crude oil geological reserves of the preset area volume unit.
Optionally, in step S104, obtaining the dissolved gas geological reserve in unit volume of the preset region according to the preset parameters of the N sub-regions and the crude oil geological reserve in unit volume of the preset region includes:
s1041, obtaining an average original dissolved gas-oil ratio of the preset area according to preset parameters of the N sub-areas.
Optionally, the average original dissolved gas-oil ratio of the preset area may be obtained according to the following formula three;
wherein,represents the average original dissolved gas-oil ratio, A, of the predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresenting the i-th sub-zone dissolved gas-oil ratio.
It can be seen from the above formula three that, when the average original dissolved gas-oil ratio of the preset region is obtained, the weighted average can be performed on each sub-region of the N sub-regions, so as to obtain the average original dissolved gas-oil ratio of the preset region, thereby improving the accuracy of the average original dissolved gas-oil ratio of the preset region.
After the relatively accurate average original dissolved gas-oil ratio of the preset region is obtained, the dissolved gas geological reserve of the preset region volume unit can be obtained through the step S1042.
S1042, obtaining the dissolved gas geological reserve of the unit volume of the preset area according to the average original dissolved gas-oil ratio of the preset area and the unit crude oil geological reserve of the unit volume of the preset area.
Optionally, the dissolved gas geological reserve of the preset area volume unit can be obtained according to the following formula four;
wherein G represents the dissolved gas geological reserve per unit volume of the preset area.
It can be seen from the above formula four that, when the dissolved gas geological reserve of the preset area volume unit is obtained, the crude oil geological reserve of the preset area volume unit in the step S1022 and the average original dissolved gas-oil ratio of the preset area in the step S1041 are obtained, and because the accuracy of the crude oil geological reserve of the preset area volume unit and the average original dissolved gas-oil ratio is higher, the accuracy of the dissolved gas geological reserve of the preset area volume unit obtained by the formula four is also higher, that is, the accuracy of the dissolved gas geological reserve of the preset area volume unit is improved.
Furthermore, the method for acquiring the crude oil geological reserves provided by the invention not only can improve the accuracy of the crude oil geological reserves of the preset area volume unit and the dissolved gas geological reserves of the preset area volume unit, but also can further improve the accuracy of the crude oil geological reserves of the preset area mass unit. In an example, the process of obtaining the geological reserves of crude oil of the preset area quality unit may further include: the preset parameters of the sub-region further include the preset parameters of the sub-region and the crude oil density of the sub-region.
Step S102, after acquiring the unit crude oil geological reserve of the preset area volume according to the average original crude oil volume coefficient of the preset area, the method can further comprise the following steps:
and S105, acquiring the crude oil density of the N sub-regions.
When the crude oil density of the sub-area is obtained, crude oil fluid samples under various measuring points can be obtained through testing of one or more well modular dynamic testers in the original state of crude oil, then the crude oil density of each sample is obtained through an indoor high-pressure physical property experiment, and linear regression is carried out on the crude oil density and the altitude depth of the measuring points, so that a linear relation between the crude oil density and the altitude is obtained. When a geological reserve of a certain crude oil is obtained, the altitude of the crude oil can be substituted into the linear relation, so that the crude oil density is obtained.
Alternatively, step S105 may be executed after step S102, before step S102, or, of course, may also be executed simultaneously with step S102, and here, this embodiment is only described by taking the example that step S105 may be executed after step S102, and does not represent that the present invention is limited thereto.
After the crude oil densities of the N sub-regions are obtained, the preset regional mass unit crude oil geological reserves can be obtained through the following step S106.
S106, obtaining the unit crude oil geological reserves of the preset area quality according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the preset area volume.
Optionally, in step S106, obtaining the unit crude oil geological reserves of the preset area mass according to the crude oil densities of the N sub-areas and the unit crude oil geological reserves of the preset area volume may include:
s1061, acquiring the crude oil density of the preset area according to the preset parameters of the N sub-areas.
Optionally, the average crude oil density of the preset area may be obtained according to the following formula five;
wherein,denotes the average crude oil density of the predetermined region, AiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
It can be seen from the fifth formula that when the average crude oil density of the preset region is obtained, the weighted average can be performed on each sub-region of the N sub-regions, so that the average crude oil density of the preset region is obtained, and the accuracy of the average crude oil density of the preset region is improved.
After the accurate average crude oil density of the preset area is obtained, the geological reserves of crude oil of the preset area quality unit can be obtained through the step S1062.
S1062, obtaining the unit crude oil geological reserves of the preset area mass according to the average crude oil density of the preset area and the unit crude oil geological reserves of the preset area volume.
Optionally, the geological reserves of crude oil in unit of mass in a preset area can be obtained according to the following formula six;
wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
It can be seen from the sixth formula that, when the unit crude oil geological reserve of the preset area quality is obtained, the unit crude oil geological reserve of the preset area volume in the step S1022 and the average crude oil density in the preset area in the step S1061 are obtained, and because the accuracy of the unit crude oil geological reserve of the preset area volume and the average crude oil density is higher, the accuracy of the unit crude oil geological reserve of the preset area quality obtained by the sixth formula is higher, that is, the accuracy of the unit crude oil geological reserve of the preset area quality is improved.
According to the method for acquiring the crude oil geological reserve, the preset parameters of N sub-regions are acquired; and acquiring the unit crude oil geological reserve of the volume of the preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2. Therefore, when the unit crude oil geological reserve of the preset region volume is calculated, the preset region is divided into N sub-regions, the unit crude oil geological reserve of the preset region volume is calculated through preset parameters of the N sub-regions, and in addition, the unit dissolved gas geological reserve of the preset region volume and the unit crude oil geological reserve of the preset region mass can be further obtained, so that the accuracy of the crude oil geological reserve is improved.
Fig. 3 is a schematic structural diagram of a first embodiment of the device 30 for acquiring geological reserves of a reservoir with a gravity differentiation phenomenon according to the present invention, and please refer to fig. 3, the device 30 for acquiring geological reserves of a reservoir with a gravity differentiation phenomenon may include:
an obtaining module 301, configured to obtain preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and a crude oil volume coefficient of the subarea.
The processing module 302 is configured to obtain the unit crude oil geological reserves of the preset region volume according to preset parameters of the N sub-regions, where the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2.
The oil reservoir geological reserve acquisition device 30 with the gravity differentiation phenomenon shown in the embodiment of the invention can implement the technical scheme shown in the embodiment of the method, and the implementation principle and the beneficial effect are similar, so that the detailed description is omitted.
Optionally, the processing module 302 is specifically configured to obtain an average original crude oil volume coefficient of the preset region according to preset parameters of the N sub-regions.
The processing module 302 is specifically configured to obtain the geological reserves of unit crude oil in the volume of the preset region according to the average original crude oil volume coefficient of the preset region.
Optionally, the preset parameter of the sub-region further includes an original dissolved gas-oil ratio of the sub-region.
The obtaining module 301 is further configured to obtain the original dissolved gas-oil ratios of the N sub-regions.
The processing module 302 is further configured to obtain the dissolved gas geological reserves of the preset area volume unit according to the preset parameters of the N sub-areas and the crude oil geological reserves of the preset area volume unit.
Optionally, the processing module 302 is specifically configured to obtain an average original dissolved gas-oil ratio of the preset region according to preset parameters of the N sub-regions.
The processing module 302 is specifically configured to obtain the dissolved gas geological reserve of the preset area volume unit according to the average original dissolved gas-oil ratio of the preset area and the crude oil geological reserve of the preset area volume unit.
Optionally, the preset parameter of the sub-zone further comprises the crude oil density of the sub-zone.
The obtaining module 301 is further configured to obtain the crude oil densities of the N sub-regions.
The processing module 302 is further configured to obtain the unit crude oil geological reserves of the preset area quality according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the preset area volume.
Optionally, the processing module 302 is specifically configured to obtain an average crude oil density of a preset region according to preset parameters of the N sub-regions.
The processing module 302 is specifically configured to obtain the unit crude oil geological reserves of the preset area quality according to the average crude oil density of the preset area and the unit crude oil geological reserves of the preset area volume.
Optionally, the processing module 302 is specifically configured to obtain an average original crude oil volume coefficient of the preset region according to the following formula i.
Wherein,mean original crude oil volume coefficient, A, representing a predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
Optionally, the processing module 302 is specifically configured to obtain the unit crude oil geological reserve of the preset region volume according to the following formula two.
Wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,and N represents the unit crude oil geological reserve of the volume of the preset area.
Optionally, the processing module 302 is specifically configured to obtain an average original dissolved gas-oil ratio of the preset area according to the following formula three.
Wherein,represents the average original crude oil dissolved gas-oil ratio, A, of the preset areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresents the dissolved gas-oil ratio of the ith sub-zone.
Optionally, the processing module 302 is specifically configured to obtain the dissolved gas geological reserve of the preset area volume unit according to the following formula four.
Wherein G represents the dissolved gas geological reserve per unit volume of the preset area.
Optionally, the processing module 302 is specifically configured to obtain the crude oil density of the preset region according to the following formula five.
Wherein,denotes the average crude oil density of the predetermined region, AiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
Optionally, the processing module 302 is specifically configured to obtain the geological reserves of crude oil in unit of mass in the preset area according to the following formula six.
Wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
The oil reservoir geological reserve acquisition device 30 with the gravity differentiation phenomenon shown in the embodiment of the invention can implement the technical scheme shown in the embodiment of the method, and the implementation principle and the beneficial effect are similar, so that the detailed description is omitted.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (24)
1. A method for acquiring the geological reserves of an oil reservoir with gravity differentiation phenomenon is characterized by comprising the following steps:
acquiring preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and crude oil volume coefficient of the subarea;
and acquiring the unit crude oil geological reserve of the volume of a preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2.
2. The method according to claim 1, wherein the obtaining of the geological reserves of crude oil per unit volume of a preset region according to the preset parameters of the N sub-regions comprises:
acquiring the average original crude oil volume coefficient of the preset region according to the preset parameters of the N sub-regions;
and acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area.
3. The method of claim 2, wherein the pre-set parameters of the sub-region further comprise a raw dissolved gas-oil ratio of the sub-region;
after acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area, the method further comprises the following steps:
acquiring the original dissolved gas-oil ratio of the N sub-regions;
and acquiring the dissolved gas geological reserves of the unit volume of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
4. The method of claim 3, wherein said obtaining the predetermined zone volume unit solution gas geological reserve according to the predetermined parameters of the N sub-zones and the predetermined zone volume unit crude oil geological reserve comprises:
acquiring the average original dissolved gas-oil ratio of the preset area according to preset parameters of the N sub-areas;
and acquiring the dissolved gas geological reserve of the preset area volume unit according to the average original dissolved gas-oil ratio of the preset area and the crude oil geological reserve of the preset area volume unit.
5. The method of claim 2, wherein the predetermined parameters of the sub-region further comprise a crude oil density of the sub-region;
after acquiring the unit crude oil geological reserve of the volume of the preset area according to the average original crude oil volume coefficient of the preset area, the method further comprises the following steps:
acquiring the crude oil density of the N sub-regions;
and acquiring the unit crude oil geological reserves of the mass of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
6. The method of claim 5, wherein the obtaining the predetermined regional mass unit crude oil geological reserve from the crude oil densities of the N sub-regions and the predetermined regional volume unit crude oil geological reserve comprises:
acquiring the average crude oil density of the preset area according to preset parameters of the N sub-areas;
and acquiring the unit crude oil geological reserve of the mass of the preset area according to the average crude oil density of the preset area and the unit crude oil geological reserve of the volume of the preset area.
7. The method according to claim 2, wherein the obtaining the average original crude oil volume coefficient of the preset region according to the preset parameters of the N sub-regions comprises:
according toObtaining the average original crude oil volume coefficient of the preset area;
wherein,representing the mean original crude oil volume coefficient, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiIndicates that the ith sub-region hasEffective porosity, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
8. The method as claimed in claim 7, wherein the obtaining the geological reserves of crude oil in unit of volume of the preset area according to the average original crude oil volume coefficient of the preset area comprises:
according toAcquiring the geological reserves of crude oil in unit of the volume of the preset area;
wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,and N represents the unit crude oil geological reserve of the volume of the preset area.
9. The method according to claim 4, wherein the obtaining the average raw dissolved gas-oil ratio of the preset region according to the preset parameters of the N sub-regions comprises:
according toObtaining the average original dissolved gas-oil ratio of the preset area;
wherein,represents the aboveAverage original dissolved gas-oil ratio, A, of the predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresenting the i-th sub-zone dissolved gas-oil ratio.
10. The method of claim 9, wherein the obtaining the predetermined zone volume unit dissolved gas geological reserve from the predetermined zone average raw dissolved gas oil ratio and the predetermined zone volume unit crude oil geological reserve comprises:
according toObtaining the dissolved gas geological reserve of the preset area volume unit;
wherein G represents the dissolved gas geological reserve per volume unit of the preset area.
11. The method of claim 6, wherein obtaining the average crude oil density of the preset region according to the preset parameters of the N sub-regions comprises:
according toAcquiring the average crude oil density of the preset area;
wherein,representing the average crude oil density, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
12. The method of claim 11, wherein the obtaining the unit crude oil geological reserve of the preset area mass from the average crude oil density of the preset area and the unit crude oil geological reserve of the preset area volume comprises:
according toAcquiring the geological reserves of crude oil of the preset area quality unit;
wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
13. An oil reservoir geological reserve acquisition device with a gravity differentiation phenomenon, comprising:
the acquisition module is used for acquiring preset parameters of the N sub-regions; the preset parameters of the subarea comprise an oil-containing area of the subarea, effective thickness of the subarea, effective porosity of the subarea, oil-containing saturation of the subarea and a crude oil volume coefficient of the subarea;
and the processing module is used for acquiring the unit crude oil geological reserves of the volume of a preset region according to preset parameters of the N sub-regions, wherein the preset region is divided into the N sub-regions, and N is an integer greater than or equal to 2.
14. The apparatus of claim 13,
the processing module is specifically used for acquiring the average original crude oil volume coefficient of the preset region according to the preset parameters of the N sub-regions;
the processing module is specifically used for obtaining the geological reserves of crude oil in unit volume of the preset area according to the average original crude oil volume coefficient of the preset area.
15. The apparatus of claim 14, wherein the preset parameters of the sub-region further comprise an original dissolved gas-oil ratio of the sub-region;
the acquisition module is further used for acquiring the original dissolved gas-oil ratio of the N sub-regions;
and the processing module is also used for acquiring the dissolved gas geological reserves of the unit volume of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
16. The apparatus of claim 15,
the processing module is specifically configured to obtain an average original dissolved gas-oil ratio of the preset region according to preset parameters of the N sub-regions;
the processing module is specifically used for obtaining the dissolved gas geological reserves of the preset area volume unit according to the average original dissolved gas-oil ratio of the preset area and the crude oil geological reserves of the preset area volume unit.
17. The apparatus of claim 14, wherein the preset parameters of the sub-region further comprise a crude oil density of the sub-region;
the acquisition module is further used for acquiring the crude oil density of the N sub-regions;
and the processing module is also used for acquiring the unit crude oil geological reserves of the mass of the preset area according to the preset parameters of the N sub-areas and the unit crude oil geological reserves of the volume of the preset area.
18. The apparatus of claim 17,
the processing module is specifically used for acquiring the average crude oil density of the preset area according to the preset parameters of the N sub-areas;
the processing module is specifically used for obtaining the unit crude oil geological reserves of the mass of the preset area according to the average crude oil density of the preset area and the unit crude oil geological reserves of the volume of the preset area.
19. The apparatus of claim 14,
the processing module is specifically used forObtaining the average original crude oil volume coefficient of the preset area;
wherein,representing the mean original crude oil volume coefficient, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiAnd (4) representing the volume coefficient of crude oil in the ith sub-region.
20. The apparatus of claim 19,
the processing module is specifically used forAcquiring the geological reserves of crude oil in unit of the volume of the preset area;
wherein A represents the oil-containing area of the predetermined region,represents the average effective thickness of the preset area,represents the average effective porosity of a predetermined area,representing the average oil saturation of a predetermined area, N representing a predeterminedAnd setting the crude oil geological reserve of the regional volume unit.
21. The apparatus of claim 16,
the processing module is specifically used forObtaining the average original dissolved gas-oil ratio of the preset area;
wherein,representing the average original dissolved gas-oil ratio, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresents the volume coefficient, R, of the crude oil in the ith sub-regioniRepresents the dissolved gas-oil ratio of the ith sub-zone.
22. The apparatus of claim 21,
the processing module is specifically used forObtaining the dissolved gas geological reserve of the preset area volume unit;
wherein G represents the dissolved gas geological reserve per volume unit of the preset area.
23. The apparatus of claim 18,
the processing module is specifically used forAcquiring the average crude oil density of the preset area;
wherein,representing the average crude oil density, A, of said predetermined areaiDenotes the oil-containing area of the i-th sub-region, hiRepresents the effective thickness of the ith sub-region, phiiRepresents the i-th sub-region effective porosity, siDenotes the oil saturation of the i-th sub-region, BiRepresenting the volume coefficient, p, of the crude oil in the ith sub-regioniRepresenting the crude oil density of the ith sub-zone.
24. The apparatus of claim 23,
the processing module is specifically used forAcquiring the geological reserves of crude oil of the preset area quality unit;
wherein N iszAnd representing the crude oil geological reserves of the mass unit of the preset area.
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