CN110566194B - Comprehensive quantitative evaluation method and device for multilayer oil-containing system reservoir - Google Patents
Comprehensive quantitative evaluation method and device for multilayer oil-containing system reservoir Download PDFInfo
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Abstract
The invention discloses a comprehensive quantitative evaluation method and a device for a multilayer oil-containing system reservoir, and the comprehensive quantitative evaluation method for the multilayer oil-containing system reservoir comprises the following steps: selecting a research area, and carrying out longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units; classifying the reservoir evaluation units according to the sand development degree; assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values; uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs; adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to set weight to obtain a total grid graph; and evaluating the sand body development condition according to the attribute values in the total grid map. The method solves the problems that the determination of the comprehensive potential range is directly influenced, and the exploration evaluation and well position deployment of the oil field are influenced.
Description
Technical Field
The invention relates to the field of petroleum exploration, evaluation and development, in particular to the field of petroleum exploration, evaluation and development, which relates to reservoir stratum and oiliness evaluation research, and specifically relates to a comprehensive quantitative evaluation method and device for a multilayer oiliness system reservoir stratum.
Background
The purpose of the comprehensive evaluation of the multilayer oil-containing system reservoir is to statistically research geological parameters of each layer system, evaluate geological risks of each layer system by adopting a uniform evaluation standard, determine the risk level and point out the current development well-arrangement key area. Through investigation, the conventional comprehensive evaluation of the multilayer oil-containing system reservoir has the following problems: (1) the oil-gas-bearing layers are multiple, geological risk factors of each layer are different in selection, and evaluation value standards are not uniform; (2) each layer system potential area is irregular in shape and size, more in calculation units, large in data volume and large in difficulty in potential area summarization after stacking; (3) the overall evaluation result has no effective and visual expression form; at present, the expression form of the comprehensive potential of the multilayer oil-bearing stratum is simple area superposition, namely the boundaries of the sand development potential areas of the reservoirs of different layers are superposed, and the intersection of the multilayer boundaries is the most favorable area for reservoir development. These problems directly affect the determination of the comprehensive potential range and the k exploration evaluation and well location deployment of the oil field. Therefore, the research and exploration of an effective and visual comprehensive reservoir potential evaluation method and expression form have great significance for oil field production.
Disclosure of Invention
In view of the above, the invention provides a method and a device for comprehensively and quantitatively evaluating a multilayer oil-containing system reservoir, so as to solve the problems that the multilayer oil-containing system comprehensive evaluation method has multiple oil-gas-containing layers, different geological risk factors of each layer system, non-uniform evaluation value standard, irregular shape and size of each layer system potential area, multiple calculation units, large data size and large difficulty in gathering potential areas after stacking, and realize effective and comprehensive expression of the potential of the multilayer oil-containing system reservoir.
In a first aspect, the invention provides a comprehensive quantitative evaluation method for a multilayer oil-containing system reservoir, which comprises the following steps:
selecting a research area, and carrying out longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
classifying the reservoir evaluation units according to the sand development degree;
assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to set weight to obtain a total grid graph;
evaluating the sand body development condition according to the attribute values in the total grid diagram;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
Preferably, each of the plurality of reservoir evaluation units is classified according to the sand development degree, and the classification is as follows: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone;
then, respectively assigning the attributes of the classified reservoir evaluation units;
wherein the type I sandstone development zone is best in development, the type II sandstone development zone is medium in development, and the type III sandstone development zone is worst in development.
Preferably, the method for respectively assigning the attributes of the classified reservoir evaluation units comprises the following steps: the assignment to the type I sandstone development zone is the largest, the assignment to the type III sandstone development zone is the smallest, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone.
Preferably, after the total grid map is obtained, reading an abscissa value, an ordinate value and an attribute value of each grid point of the total grid map to form a comprehensive sand body development evaluation map reflecting the sand body development degree of all reservoir evaluation units;
then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart;
wherein, the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value;
and the area with larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer.
Preferably, the specific method for obtaining a plurality of reservoir evaluation units by dividing the research area into longitudinal reservoir evaluation units is as follows: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
and the number of the plurality of reservoir evaluation units is the number of logging interpretation stratum comparison units.
In a second aspect, the present invention provides a device for comprehensively and quantitatively evaluating a multilayer oil-containing system reservoir, comprising:
the device comprises a dividing unit, a storage layer evaluation unit and a storage layer evaluation unit, wherein the dividing unit is used for reading data of a research area and dividing the longitudinal storage layer evaluation unit of the research area to obtain a plurality of storage layer evaluation units;
the classification unit is used for classifying the reservoir evaluation units according to the sand development degree;
the assignment unit is used for assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
the first generation unit is used for uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
a second generating unit, which adds the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to the set weight to obtain a total grid graph;
the evaluation unit is used for evaluating the sand body development condition according to the attribute values in the total grid map;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
Preferably, the classification unit classifies each of the plurality of reservoir evaluation units according to the sand development degree, and the classification is as follows: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone;
then, respectively assigning values to the attributes of the plurality of classified reservoir evaluation units;
wherein the type I sandstone development zone is best in development, the type II sandstone development zone is medium in development, and the type III sandstone development zone is worst in development.
Preferably, the assignment unit assigns the attributes of the classified reservoir evaluation units respectively to complete the following operations: the assignment to the I type sandstone development zone is the largest, the assignment to the III type sandstone development zone is the smallest, and the assignment to the II type sandstone development zone is between the I type sandstone development zone and the III type sandstone development zone.
Preferably, the comprehensive quantitative evaluation device for the multilayer oil-containing system reservoir further comprises:
a third generation unit;
after the total grid graph is obtained, the third generation unit reads the abscissa value, the ordinate value and the attribute value of each grid point of the total grid graph to form a comprehensive sand body development evaluation graph reflecting the sand body development degree of all the reservoir evaluation units;
then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart;
wherein, the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value;
the area with the larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer; and/or
And dividing the research area into longitudinal reservoir evaluation units to obtain a plurality of reservoir evaluation units, wherein the operations of the reservoir evaluation units are as follows: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
and the number of the plurality of reservoir evaluation units is the number of logging interpretation stratum comparison units.
In a third aspect, the invention provides another comprehensive quantitative evaluation device for a multilayer oil-containing system reservoir, comprising:
the storage, the processor and a computer program stored on the storage and capable of running on the processor, the computer program is a method for comprehensive quantitative evaluation of a multilayer oil-bearing system reservoir, and the processor executes the program to realize the following steps:
dividing a research area into longitudinal reservoir evaluation units to obtain a plurality of reservoir evaluation units;
classifying the reservoir evaluation units according to the sand development degree;
assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to a set weight to obtain a total grid graph;
evaluating the sand body development condition according to the attribute values in the total grid diagram;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
The invention has the following beneficial effects:
the invention provides a comprehensive quantitative evaluation method and a comprehensive quantitative evaluation device for a multilayer oil-containing system reservoir, which are used for solving the problems that the comprehensive evaluation method for the multilayer oil-containing reservoir system has a plurality of oil-containing gas layers, different geological risk factors of each layer system are selected, the evaluation value standards are not uniform, the shapes and the sizes of potential areas of each layer system are irregular, a plurality of calculation units are provided, the data size is large, and the aggregation difficulty of potential areas after stacking is large, so that the determination of a comprehensive potential range is directly influenced, and the exploration evaluation and well location deployment of an oil field are influenced. The invention realizes the effective and comprehensive expression of the potential of the reservoir of the multilayer oil-containing system.
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The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of a comprehensive quantitative evaluation method for a multilayer oil-containing system reservoir in an embodiment of the invention;
FIG. 2 is a schematic diagram of a partitioning of a reservoir evaluation unit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a grid map of an embodiment of the present invention;
FIG. 4 is a schematic representation of a comprehensive sand development evaluation chart of an embodiment of the invention;
fig. 5 is a conventional method evaluation chart.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic flow chart of a comprehensive quantitative evaluation method for a multilayer oil-containing system reservoir in an embodiment of the invention. As shown in fig. 1, a comprehensive quantitative evaluation method for a multilayer oil-bearing system reservoir comprises the following steps: step 101, selecting a research area, and performing longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units; 102, classifying the reservoir evaluation units according to the sand development degree; 103, respectively assigning the classified attributes of the plurality of reservoir evaluation units to obtain attribute values; step 104, uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs; step 105, adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to a set weight to obtain a total grid graph; step 106, evaluating the sand body development condition according to the attribute values in the total grid map; and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer. The problems that the existing comprehensive evaluation method for the multilayer oil-bearing reservoir system has the defects that the oil-bearing gas layers are multiple, the geological risk factors of each layer system are different, the evaluation value standard is not uniform, the shape and the size of the potential area of each layer system are irregular, the number of calculation units is large, the data size is large, and the potential area gathering difficulty after stacking is large are solved, so that the potential of the multilayer oil-bearing reservoir system is effective and comprehensively expressed.
In fig. 1, a research area is selected in step 101, and longitudinal reservoir evaluation unit division is performed on the research area, so that a specific method for obtaining a plurality of reservoir evaluation units is as follows: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units; and the number of the plurality of reservoir evaluation units is the number of the well logging interpretation stratum comparison units.
Specifically, in step 101, a plurality of methods for dividing the longitudinal reservoir evaluation units are provided, and the method directly adopts the well logging interpretation stratum comparison unit as the division principle of the reservoir evaluation units in the longitudinal direction, so as to divide the reservoir evaluation units into n reservoir evaluation units, wherein n is the number of the well logging interpretation stratum comparison units.
In fig. 1, step 102 classifies each of the plurality of reservoir evaluation units according to the sand development degree, where the classifications are: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone; then, respectively assigning the attributes of the classified reservoir evaluation units; wherein the type I sandstone development zone is best in development, the type II sandstone development zone is medium in development, and the type III sandstone development zone is worst in development.
Specifically, in step 102, each reservoir evaluation unit is divided into three types, I type sandstone development area, II type sandstone development area and III type sandstone development area according to the uniform sand body development degree; and dividing according to the amplitude attribute distribution characteristics of the sand body development degree represented by each reservoir evaluation unit, wherein the larger the amplitude is, the better the sand body development is. And dividing the area with the amplitude value of more than 70% into a I-type sandstone development area, wherein the area with the amplitude value of more than 70% is a III-type sandstone development area, and the other areas are II-type sandstone development areas.
In fig. 1, the step 103 of respectively assigning the attributes of the classified reservoir evaluation units includes: the assignment to the type I sandstone development zone is the largest, the assignment to the type III sandstone development zone is the smallest, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone.
Specifically, in step 103, Z values (i.e., attribute values), 3, 2, and 1 are assigned to the type I sandstone development zone, the type II sandstone development zone, and the type III sandstone development zone of each reservoir evaluation unit, respectively. That is, the type I sandstone development zone is preferably the largest Z value of the type I sandstone development zone and the smallest assignment to the type III sandstone development zone, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone, as provided by the data of 3, 2, and 1 in the present invention, that is, the assignment to the type I sandstone development zone is 3, the assignment to the type II sandstone development zone is 2, and the assignment to the type III sandstone development zone is 1.
In fig. 1, step 104 is to perform uniform meshing on the assigned reservoir evaluation units by using a set grid to obtain grid point attribute values, so as to form a plurality of grid maps. Specifically, each assigned reservoir evaluation unit is uniformly meshed by adopting 100 × 100 grids, each point on the grid is assigned according to the Z value of the sandstone development area where the point is located, that is, the attributes of each grid point of the I-type sandstone development area, the II-type sandstone development area and the III-type sandstone development area are respectively assigned to obtain the attribute values of the grid points, and n grid maps are formed.
Namely, the attributes of the plurality of classified reservoir evaluation units are respectively assigned, then the plurality of reservoir evaluation units which are assigned are uniformly gridded by adopting a set grid, 100-by-100 grids are uniformly gridded, each point on the grid is judged to be in the plurality of classified reservoir evaluation unit areas, and each point on the grid is assigned according to the plurality of classified reservoir evaluation unit areas in which each point on the grid is positioned, so that a grid point attribute value is obtained, and a plurality of grid maps are formed.
For example, a point on the grid falls within the classified region of the type I sandstone development zone, because the value of the type I sandstone development zone is 3, the value of the point on the grid is 3; points on the grid fall within the classified region of the type II sandstone development zone, because the assignment of the type I sandstone development zone is 2, the assignment of the points on the grid is 2; the points on the grid fall within the classified region of the class III sandstone development zone, because the assignment of the class III sandstone development zone is 1, the assignment of the points on this grid is 1.
In fig. 1, step 105 adds the grid point attribute values of the grid points at the same position in the plurality of grid maps by a set weight to obtain a total grid map. Specifically, the weight is assigned according to the sand development condition of each reservoir evaluation unit, and generally, the weight is assigned according to the ratio of the average sandstone thickness of the reservoir evaluation unit to the total thickness, wherein the weight is larger when the average thickness is larger, and the weight is smaller when the average thickness is smaller. Wherein the same position is the same coordinate in the plurality of grid graphs.
In fig. 1, step 106 evaluates the sand body development condition according to the attribute values in the total grid map; and the area with larger attribute value in the total grid graph is a better sand body development area, otherwise, the sand body development is poorer. Specifically, after the total grid diagram is obtained, the abscissa value, the ordinate value and the attribute value of each grid point of the total grid diagram are read, and a comprehensive sand body development evaluation diagram reflecting the sand body development degree of all reservoir evaluation units is formed; then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart; wherein the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value; and the area with larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer. The method solves the problems that the existing overall evaluation result has no effective and intuitive expression form, and the expression form of the comprehensive potential of the multilayer oil-bearing layer system is simple area superposition, namely the boundaries of the sand development potential areas of the reservoirs with different layers are superposed, and the intersection of the multilayer boundaries is the most favorable area for reservoir development.
More specifically, reading an abscissa value, an ordinate value and a Z value of each grid point of the total grid map, mapping by using mapping software such as a double fox and the like to form a comprehensive sand body development evaluation map which comprehensively reflects the sand body development degree of all reservoir evaluation units, wherein a region with a larger Z value in the comprehensive sand body development evaluation map is a region with better sand body development; on the contrary, the sand body is poorly developed.
The invention relates to a comprehensive quantitative evaluation device for a multilayer oil-containing system reservoir, which comprises: the device comprises a dividing unit, a storage layer evaluation unit and a storage layer evaluation unit, wherein the dividing unit is used for reading data of a research area and dividing the longitudinal storage layer evaluation unit of the research area to obtain a plurality of storage layer evaluation units; the classification unit is used for classifying the reservoir evaluation units according to the sand development degree; the assignment unit is used for assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values; the first generation unit is used for uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs; a second generating unit, which adds the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to the set weight to obtain a total grid graph; the evaluation unit is used for evaluating the sand body development condition according to the attribute values in the total grid map; and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
The dividing unit is used for reading data of a research area and dividing the longitudinal reservoir evaluation unit of the research area to obtain a plurality of reservoir evaluation units, and the operation of the reservoir evaluation units is as follows: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units; and the number of the plurality of reservoir evaluation units is the number of the well logging interpretation stratum comparison units.
In the comprehensive quantitative evaluation device for the multilayer oil-bearing system reservoir, the classification unit classifies each of the plurality of reservoir evaluation units according to the sand development degree, and the classification is as follows: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone; then, respectively assigning the attributes of the classified reservoir evaluation units; wherein the type I sandstone development zone is best in development, the type II sandstone development zone is medium in development, and the type III sandstone development zone is worst in development.
Specifically, each reservoir evaluation unit is divided into three types, namely a type I sandstone development area, a type II sandstone development area and a type III sandstone development area by the classification unit according to the uniform sand body development degree; and dividing according to the amplitude attribute distribution characteristics of the sand body development degree represented by each reservoir evaluation unit, wherein the larger the amplitude is, the better the sand body development is. And dividing the area with the amplitude value of more than 70% into a type I sandstone development area, wherein the area with the amplitude value of more than 70% is a type III sandstone development area, and the other areas are type II sandstone development areas.
In the comprehensive quantitative evaluation device for the multilayer oil-bearing system reservoir, the assignment units are used for assigning the attributes of the classified reservoir evaluation units respectively to complete the following operations: the assignment to the type I sandstone development zone is the largest, the assignment to the type III sandstone development zone is the smallest, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone.
Specifically, the assignment unit assigns Z values (i.e., attribute values), 3, 2, and 1, to the type I sandstone development zone, the type II sandstone development zone, and the type III sandstone development zone of each reservoir evaluation unit, respectively. That is, the type I sandstone development zone is preferably the largest Z value of the type I sandstone development zone and the smallest assignment to the type III sandstone development zone, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone, as provided by the data of 3, 2, and 1 in the present invention, that is, the assignment to the type I sandstone development zone is 3, the assignment to the type II sandstone development zone is 2, and the assignment to the type III sandstone development zone is 1.
And the first generation unit uniformly gridds the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs. Specifically, each assigned reservoir evaluation unit is uniformly meshed by adopting 100 × 100 grids, each point on the grid is assigned according to the Z value of the sandstone development area where the point is located, that is, the attributes of each grid point of the I-type sandstone development area, the II-type sandstone development area and the III-type sandstone development area are respectively assigned to obtain the attribute values of the grid points, and n grid maps are formed.
Namely, the first generation unit assigns the attributes of the plurality of classified reservoir evaluation units respectively, then uniformly grids the plurality of reservoir evaluation units with the assigned grids by adopting a set grid, uniformly grids the plurality of reservoir evaluation units with 100 × 100 grids, judges that each point on the grid falls on the plurality of classified reservoir evaluation unit areas, assigns the value of each point on the grid according to the plurality of classified reservoir evaluation unit areas of each point on the grid, obtains the attribute value of the grid point, and forms a plurality of grid maps.
For example, a point on the grid falls within the classified region of the type I sandstone development zone, because the value of the type I sandstone development zone is 3, the value of the point on the grid is 3; points on the grid fall in the classified region of the II type sandstone development zone, and because the assignment of the I type sandstone development zone is 2, the assignment of the points on the grid is 2; the points on the grid fall within the classified region of the class III sandstone development zone, because the assignment of the class III sandstone development zone is 1, the assignment of the points on this grid is 1.
The second generating unit adds the grid point attribute values of the grid points at the same position in the plurality of grid maps by a set weight to obtain a total grid map. Specifically, the weight is assigned according to the sand development condition of each reservoir evaluation unit, and generally, the weight is assigned according to the ratio of the average sandstone thickness of the reservoir evaluation unit to the total thickness, wherein the weight is larger when the average thickness is larger, and the weight is smaller when the average thickness is smaller. Wherein the same position is the same coordinate in the plurality of grid graphs.
The evaluation unit is used for evaluating the sand body development condition according to the attribute values in the total grid map; and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
In a multilayer oil-bearing system reservoir comprehensive quantitative evaluation device, the device further comprises: a third generation unit; after the total grid map is obtained, the third generation unit reads the abscissa value, the ordinate value and the attribute value of each grid point of the total grid map to form a comprehensive sand body development evaluation map reflecting the sand body development degree of all the reservoir evaluation units; then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart; wherein, the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value; and the area with larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer. The method solves the problems that the existing overall evaluation result has no effective and intuitive expression form, and the expression form of the comprehensive potential of the multilayer oil-bearing layer system is simple area superposition, namely the boundaries of the sand development potential areas of the reservoirs with different layers are superposed, and the intersection of the multilayer boundaries is the most favorable area for reservoir development.
More specifically, reading an abscissa value, an ordinate value and a Z value of each grid point of the total grid map, mapping by using mapping software such as a double fox and the like to form a comprehensive sand body development evaluation map which comprehensively reflects the sand body development degree of all reservoir evaluation units, wherein a region with a larger Z value in the comprehensive sand body development evaluation map is a region with better sand body development; on the contrary, the sand body is poorly developed.
The invention also provides another comprehensive quantitative evaluation device for the multilayer oil-containing system reservoir, which comprises: the storage, the processor and a computer program stored on the storage and capable of running on the processor, the computer program is a method for comprehensive quantitative evaluation of a multilayer oil-bearing system reservoir, and the processor executes the program to realize the following steps: dividing a research area into longitudinal reservoir evaluation units to obtain a plurality of reservoir evaluation units; classifying the reservoir evaluation units according to the sand development degree; assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values; uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs; adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to set weight to obtain a total grid graph; evaluating the sand body development condition according to the attribute values in the total grid diagram; and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer. The method for comprehensively and quantitatively evaluating the reservoir of the multilayer oil-containing system can be specifically described by referring to the description of the method for comprehensively and quantitatively evaluating the reservoir of the multilayer oil-containing system in fig. 1.
Fig. 2 is a schematic diagram of the partitioning of the reservoir evaluation unit according to an embodiment of the present invention. Based on the sand development condition, the reservoir evaluation unit is divided into a type I sandstone development area, a type II sandstone development area and a type III sandstone development area from the plane, and the type I sandstone development area, the type II sandstone development area and the type III sandstone development area are respectively distinguished by adopting different colors.
FIG. 3 is a schematic diagram of a grid map of an embodiment of the invention. The attribute of each grid point represents the sandstone development area where the grid point is located, the attribute value of the type I sandstone development area is 3, the attribute value of the type II sandstone development area is 2, and the attribute value of the type III sandstone development area is 1.
FIG. 4 is a schematic representation of a comprehensive sand development evaluation chart of an embodiment of the invention. The area with larger attribute value indicates that the whole sand body is better developed, and conversely, indicates that the whole sand body is poorer developed.
Fig. 5 is a diagram of evaluation by a conventional method. A plurality of reservoir evaluation units are overlapped together, and the transverse change trend of sand bodies cannot be distinguished.
In a word, the invention adopts the data fusion technology of uniform grid assignment and grid, thereby not only refining the type of the plane potential evaluation unit, but also enhancing the comprehensive distribution intuitiveness of the longitudinal potential unit.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, without departing from the concept of the present invention, it is possible for those skilled in the art to make various changes, substitutions of equivalents, improvements, and the like, which fall within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A comprehensive quantitative evaluation method for a multilayer oil-containing system reservoir is characterized by comprising the following steps:
selecting a research area, and carrying out longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
classifying the reservoir evaluation units according to the sand development degree;
assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to set weight to obtain a total grid graph; wherein the same position is the same coordinate in the plurality of grid graphs;
evaluating the sand body development condition according to the attribute values in the total grid diagram;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
2. The comprehensive quantitative evaluation method for the multilayer oil-bearing system reservoir according to claim 1, characterized in that:
classifying each of the plurality of reservoir evaluation units according to the sand development degree, wherein the classification is as follows: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone;
then, respectively assigning the attributes of the classified reservoir evaluation units;
wherein the type I sandstone development zone is best in development, the type II sandstone development zone is medium in development, and the type III sandstone development zone is worst in development.
3. The comprehensive quantitative evaluation method for the multilayer oil-bearing system reservoir according to claim 2, characterized in that:
the method for respectively assigning the classified attributes of the plurality of reservoir evaluation units comprises the following steps: the assignment to the type I sandstone development zone is the largest, the assignment to the type III sandstone development zone is the smallest, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone.
4. The comprehensive quantitative evaluation method for the multilayer oil-containing system reservoir according to any one of claims 1 to 3, characterized in that:
after the total grid diagram is obtained, reading the abscissa value, the ordinate value and the attribute value of each grid point of the total grid diagram to form a comprehensive sand body development evaluation diagram reflecting the sand body development degree of all reservoir evaluation units;
then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart;
wherein, the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value;
and the area with larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer.
5. The comprehensive quantitative evaluation method for the multilayer oil-containing system reservoir according to any one of claims 1 to 3, characterized in that:
the specific method for dividing the longitudinal reservoir evaluation units into a plurality of reservoir evaluation units in the research area comprises the following steps: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
and the number of the plurality of reservoir evaluation units is the number of logging interpretation stratum comparison units.
6. The utility model provides a comprehensive quantitative evaluation device of multilayer oil-bearing system reservoir, its characterized in that includes:
the device comprises a dividing unit, a storage layer evaluation unit and a storage layer evaluation unit, wherein the dividing unit is used for reading data of a research area and dividing the longitudinal storage layer evaluation unit of the research area to obtain a plurality of storage layer evaluation units;
the classification unit is used for classifying the reservoir evaluation units according to the sand development degree;
the assignment unit is used for assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
the first generation unit is used for uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
a second generating unit, which adds the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to the set weight to obtain a total grid graph; wherein the same position is the same coordinate in the plurality of grid graphs;
the evaluation unit is used for evaluating the sand body development condition according to the attribute values in the total grid map;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
7. The comprehensive quantitative evaluation device for the multilayer oil-bearing system reservoir according to claim 6, characterized in that:
the classification unit classifies each reservoir evaluation unit according to the sand development degree, and the classification is as follows: a type I sandstone development zone, a type II sandstone development zone and a type III sandstone development zone;
then, respectively assigning the attributes of the classified reservoir evaluation units;
the type I sandstone development zone preferably develops, the type II sandstone development zone preferably develops in a medium manner, and the type III sandstone development zone preferably develops in a worst manner.
8. The comprehensive quantitative evaluation device for the multilayer oil-containing system reservoir according to claim 7, characterized in that:
the assignment unit is used for assigning the attributes of the classified reservoir evaluation units respectively to complete the following operations: the assignment to the type I sandstone development zone is the largest, the assignment to the type III sandstone development zone is the smallest, and the assignment to the type II sandstone development zone is between the type I sandstone development zone and the type III sandstone development zone.
9. A comprehensive quantitative evaluation device for a multilayer oil-bearing system reservoir according to claim 7 or 8, characterized by further comprising:
a third generation unit;
after the total grid map is obtained, the third generation unit reads the abscissa value, the ordinate value and the attribute value of each grid point of the total grid map to form a comprehensive sand body development evaluation map reflecting the sand body development degree of all the reservoir evaluation units;
then, evaluating the sand body development condition according to the comprehensive sand body development evaluation chart;
wherein, the plurality of grid graphs and the total grid graph are three-dimensional graphs, and the attribute value is a Z value;
the area with the larger attribute value in the comprehensive sand body development evaluation graph is a better sand body development area, otherwise, the sand body development is poorer;
and/or the presence of a gas in the interior of the container,
and dividing the research area into longitudinal reservoir evaluation units, wherein the operation of obtaining a plurality of reservoir evaluation units is as follows: adopting a logging interpretation stratum comparison unit as a longitudinal reservoir evaluation unit division principle to perform longitudinal reservoir evaluation unit division on the research area to obtain a plurality of reservoir evaluation units;
and the number of the plurality of reservoir evaluation units is the number of logging interpretation stratum comparison units.
10. The utility model provides a multilayer oiliness system reservoir stratum comprehensive quantitative evaluation device which characterized in that includes:
a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the computer program is a method for comprehensive quantitative evaluation of a multilayer oil-bearing system reservoir as claimed in any one of claims 1 to 5, and the processor executes the program to realize the following steps:
dividing a research area into longitudinal reservoir evaluation units to obtain a plurality of reservoir evaluation units;
classifying the reservoir evaluation units according to the sand development degree;
assigning the attributes of the classified reservoir evaluation units respectively to obtain attribute values;
uniformly meshing the assigned reservoir evaluation units by adopting a set grid to obtain grid point attribute values and form a plurality of grid graphs;
adding the grid point attribute values of the grid points at the same position in the plurality of grid graphs according to set weight to obtain a total grid graph; wherein the same position is the same coordinate in the plurality of grid graphs;
evaluating the sand body development condition according to the attribute values in the total grid diagram;
and the area with larger attribute value in the total grid map is a better sand body development area, otherwise, the sand body development is poorer.
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| CN115545480A (en) * | 2022-10-10 | 2022-12-30 | 长江大学 | Reservoir connectivity evaluation method based on lithofacies model |
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