A method for quantitatively evaluating the enrichment degree of fault-controlled 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 field of gas field exploration technology, and particularly relates to a method for quantitatively evaluating the enrichment degree of fault-controlled natural gas reservoirs. Background technique [0002] Fault-controlled natural gas reservoirs refer to the lower-generation and upper-storage natural gas reservoirs formed in the outer traps of the source rock series with faults as the main channel. At present, most of the gas reservoirs discovered in the eastern basin of China belong to this type. The traditional method of evaluating the degree of enrichment of fault-controlled natural gas reservoirs is mainly based on the results of gas field exploration practices, analyzing the relationship between accumulation factors such as generation, transportation, storage, accumulation, and dispersal, and natural gas enrichment, so as to analyze fault-controlled natural gas. A macroscopic qualitative analysis is carried out on the degre...

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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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