Establishment method and application of carbonate rock reservoir classification plate

Abstract

The invention relates to an establishment method and an application of a carbonate rock reservoir classification plate. The establishment method is characterized by comprising the steps of: 1) establishing a equilateral triangle coordinate graph, wherein a base coordinate axis of the triangle coordinate graph represents a rock type variation, a left side coordinate axis of the triangle coordinate graph represents a sedimentary facies variation, and a right side coordinate axis of the triangle coordinate graph represents a diagenetic type variation; 2) dividing each of the three coordinate axes into n equal parts, wherein each equal part accordingly represents a rock type of shale content, a sedimentary facies of water body energy and a diagenetic type of diagenesis; 3) and drawing n-1 parallel lines which are parallel to the side which represents the diagenetic type variation and the side which represents the sedimentary facies variation on the triangle coordinate graph, so as to divide the triangle coordinate graph into a plurality of subclass reservoirs, wherein physical properties of the carbonate rock reservoirs are sequentially and progressively decreased from the subclass reservoir at the upper part to the subclass reservoir at the lower side of the triangle coordinate graph. The establishment method and the application of the carbonate rock reservoir classification plate can be widely used in the field of oil and gas field exploitation geology.

Description

technical field [0001] The invention relates to a method for establishing a carbonate reservoir classification map and its application, and belongs to the field of oil and gas field development geology. Background technique [0002] Marine carbonate rocks play a very important role in global oil and gas exploration, and are important oil and gas production layers in the world. Compared with clastic rock reservoirs, carbonate rock reservoirs have more complex characteristics, and sedimentary facies Factors such as , rock type and diagenetic type have a more significant impact on the physical properties of the reservoir. Carbonate reservoirs have the characteristics of many types of storage space (matrix pores, dissolved pores, fractures, micro-fractures), obvious secondary changes, strong heterogeneity and anisotropy. The distribution of favorable reservoirs is unclear. The study found that the quality of physical properties is an important evaluation criterion for whether ...

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Problems solved by technology

[0003] In recent years, there are relatively few classification methods for carbonate reservoirs with complex pore structures, and they are relatively concentrated. Cave type, cave-fracture type), according to the complex pore structure of carbonate reservoirs, the comprehensive scoring method is used for classification, and the simple mathematical method is used for classification. However, these methods are not systematically implemented in practice. Consider geological factors affecting carbonate reservoirs with complex pore structures, and many classification methods have limited applicability

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