Method for quantitatively evaluating degree of enrichment of contactor-relay control natural gas reservoirs

Abstract

The invention provides a method for quantitatively evaluating the degree of enrichment of contactor-relay control natural gas reservoirs, and belongs to the technical field of gas field exploration. The method comprises the following steps: selecting six geological factors related to the degree of enrichment of the contactor-relay control gas reservoirs: average gas generating strength in a source rock-fault contact point, source rock-fault contact area, reservoir formation period source-stored residual pressure difference, natural gas longitudinal migration distance, fault dip cosine value, and a preservation condition parameter; selecting a plurality of proven gas reservoirs, obtaining corresponding six factors and a enrichment degree parameter of the proven gas reservoirs, drawing a scatter diagram, and obtaining a relation between a single factor and the degree of enrichment; establishing a multi-factor prediction model of the degree of enrichment of contactor-relay control natural gas reservoirs by treating the relation with multiple linear regression; and primarily selecting an exploration potential region, obtaining corresponding six factors of the exploration potential region, and selecting an exploration potential region according to the multi-factor prediction model. As a multi-factor comprehensive prediction model is established, the quantitative evaluation precision of the degree of enrichment of the contactor-relay control gas reservoirs can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of gas field exploration, in particular to a method for quantitatively evaluating the enrichment degree of fault-controlled natural gas pools. Background technique [0002] Fault-controlled natural gas pools refer to the natural gas pools of bottom-generation and top-storage accumulation formed in traps outside the system of source rocks with faults as the main transportation channels. Most of the gas pools discovered in basins in eastern China so far belong to this type. The traditional method of evaluating the enrichment degree of fault-controlled natural gas pools is mainly based on the actual results of gas field exploration, and analyzes the relationship between accumulation factors such as generation, migration, storage, accumulation, and dispersion and natural gas enrichment, so as to analyze the fault-controlled natural gas accumulation degree. A macroscopic qualitative analysis was carried out on th...

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Problems solved by technology

[0005] Aiming at the technical problem that the above-mentioned existing quantitative evaluation method for the enrichment degree of fault-controlled natural gas reservoirs is limited to a single factor and has low evaluation accuracy, the present invention proposes a method for quantitatively evaluating the enrichment degree of fault-controlled natural gas reservoirs, and establishes a multi-factor comprehensive The prediction model can effectively improve the quantitative evaluation accuracy of the enrichment degree of fault-controlled natural gas reservoirs

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