Method for establishing accumulation model of atmospheric pressure shale gas reservoir in complicated basin marginal tectonic zone

Abstract

The invention discloses a method for establishing an accumulation model of anatmospheric pressure shale gas reservoir in a complicated basin marginal tectonic zone. Based on the analysis of the basic geological characteristics,the enrichment law research and the exploration and development practice of the atmospheric shale gas, theaccumulation model of the atmospheric pressure shale gas reservoir in the complicated basin marginal tectonic zonewith "sedimentation phase supplying hydrocarbon and controlling storage, constructing movement to control and ensure enrichment and loss retention for accumulation" is established; understanding of further deepening the atmospheric pressure shale gas reservoirin thecomplicated basin marginal tectonic zone is realized,and theoretical support isprovided for the exploration of the atmospheric pressure shale gas reservoir; and after exploration and practice verification, breakthroughs in atmospheric pressure shale gas exploration are achieved, the method is of great significance for the increase and storage of the atmospheric pressure shale gas in southern China.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploration, and in particular relates to a method for establishing an accumulation model of normal-pressure shale gas reservoirs in a basin-margin complex structure area. Background technique [0002] In recent years, significant progress has been made in the exploration and development of marine shale gas in my country. Large-scale commercial development has been realized in Jiaoshiba, Changning-Zhaotong, Weiyuan and other areas in the Sichuan Basin and its surrounding areas. The target layer is the Ordovician Wufeng Formation- Silurian Longmaxi Formation. The above-mentioned large-scale development zones have the following common characteristics: located in the stable Sichuan Basin, with wide and gentle structures, low degree of deformation, high formation pressure coefficient, sufficient formation energy, high gas content, large abundance of shale gas resources, single well test production H...

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Problems solved by technology

[0005] The present invention aims to provide a method for establishing a normal-pressure shale gas accumulation model in a basin-margin complex structure zone, which solves the problem that the prior art cannot be directly applied to the evaluation of normal-pressure shale gas accumulation models in a basin-margin complex structure zone, and is difficult to adapt to The demand for deepening exploration and development in structurally complex areas;

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