Optimization method and system for exhaustion type oil and gas reservoir target region based on seismic exploration

Abstract

The invention discloses an optimization method and system for an exhaustion type oil and gas reservoir target region based on seismic exploration. The optimization method comprises the steps of: acquiring three-dimensional seismic data; performing horizon calibration and drilling geology recovery to obtain a seismic geologic structure interpretation scheme; establishing a speed model; performing plugging performance analysis on a fault to obtain plugging performance data of the fault; performing sealing analysis on a cover layer to obtain sealing data of the cover layer; evaluating and analyzing a target region and a well trajectory scheme of a phase storage well through coherent slices to obtain an initial target region; and selecting a target region in the initial target region according to optimal parameters to obtain a final target region. According to the optimization method and the system, the sealing performance of the target gas reservoir cover layer of a gas storage, the plugging performance of the fault and the quality and connectivity of the reservoir can be visually reflected, the target region is optimized, the problems of the sealing performance of the decisive layer and the sealing performance of the cover layer are effectively solved, meanwhile, a large crack system can be predicted, and powerful guarantee is provided for gas storage construction.

Description

technical field [0001] The invention relates to the technical field of geophysical signal interpretation, and belongs to the category of geophysical signal interpretation, in particular to a method and system for optimizing target areas of depleted oil and gas reservoirs based on seismic exploration. Background technique [0002] Underground gas storage is an important and indispensable part of the natural gas industry chain. The existing natural gas utilization experience and the stable gas supply in the Beijing-Tianjin-Hebei region in recent years have fully proved that underground gas storage is the most effective and reliable Peak shaving and reserve means. [0003] However, the construction of underground gas storage requires accurate determination of the scale and shape of the gas reservoir. There are several difficulties in the construction of gas storage: 1. The structure is high and steep, and the stratum changes quickly; 2. The gas storage layer is thin; 3. The str...

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Problems solved by technology

[0003] However, the construction of underground gas storage requires accurate determination of the scale and shape of the gas reservoir. There are several difficulties in the construction of gas storage: 1. The structure is high and steep, and the stratum changes quickly; 2. The gas storage layer is thin; 3. The stress is complex and fractures development

[0004] Among them, the construction of underground gas storage for depleted oil and gas reservoirs is a relatively new direction. The selection of the area is the most basic and critical step. There will be problems with the sealing of faults and cap rocks, which cannot ensure the stability and storage capacity of gas reservoirs. At the same time, during the drilling of injection-production wells, Unable to ensure that larger fracture systems are not encountered, which may damage the originally tight gas reservoir

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