Method for evaluating shale gas reservoir and searching sweet spot region

Abstract

The present invention discloses a method for evaluating shale gas reservoirs and searching sweet spot regions, which includes steps as follows: drilling corestone columns with different directions and measuring dynamic and static parameters of the corestone columns after saturation to obtain a transformable relational expression of dynamic and static elasticity modulus, processing physical simulation of anisotropic rocks, and calculating elastic parameters; intersecting to obtain related relationship corresponding to elastic and sensitive parameters or the combination of the elastic and sensitive parameters and parameters of shale gas sweet spot regions, getting and predicating the parameters or parameter combination of the shale gas sweet spot regions; correcting log data to obtain optimal well log; utilizing multi-mineral analysis and corestone test analysis methods to obtain a model and processing in series; inverting three-dimensional high resolution post-stack seismic data; synthesizing obtained various favorable parameters of the shale gas reservoirs and combining the accurate burial depth, thickness, occurrence and planar distribution of the shale gas reservoirs to obtain the gas bearing characteristic prospect of the shale gas reservoirs and outline the sweet spot regions for shale gas exploration and development.

Description

technical field [0001] The present invention belongs to the application of geophysical exploration methods, which is a comprehensive application of rock physics, logging data, omni-directional or wide-azimuth three-dimensional seismic data and other comprehensive geophysical exploration technologies to evaluate shale gas reservoirs and find sweet spots for shale gas exploration and development area method. Background technique [0002] Shale gas resources are abundant, and the exploration and development of shale gas is expected to alleviate the energy crisis. However, as a kind of oil and gas resources, although its accumulation mode is different from that of conventional oil and gas reservoirs, the exploration and development are in the exploratory stage, mainly concentrated in the The study of shale gas accumulation model and geological characteristics, etc., and the role of geophysical technology in shale gas exploration and development have yet to be developed. Althoug...

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Problems solved by technology

[0004] To sum up, in the current shale gas exploration, the application test of logging or seismic exploration technology is only carried out in trial exploration, and the comprehensive geophysical exploration technology has not been applied to evaluate the gas-bearing prospect of shale gas reservoirs and search for exploration and development. The sweet spots of shale gas, and the detailed description and specific details of how to comprehensively apply geophysical exploration technology in the evaluation of shale gas reservoirs have not been disclosed

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