A Method for Evaluating Shale Gas Reservoirs and Finding Sweet Spots
A technology for shale reservoirs and shale gas, which is applied in the field of finding sweet spots in shale gas exploration and development, and can solve the problem of evaluating the gas-bearing prospects of shale gas reservoirs and evaluating geophysical exploration technology for undisclosed shale gas reservoirs and other issues to achieve the effect of improving the section resolution and widening the frequency band
Active Publication Date: 2017-09-22
BGP OF CHINA NAT GASOLINEEUM CORP
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[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 spot" 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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[0063] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0064] The present invention mainly is made up of following specific steps:
[0065] The present invention is realized through the following steps, as figure 1 Shown:
[0066] 1) Drill core pillars in different directions on the core pillars with different buried depths in all wells in the exploration area, vacuum the core pillars and pressurize and saturate them with mineralized water with the same resistivity as the mineralized water in the formation. The different directions are vertical, horizontal, and 45-degree angles with the occurrence of the formation. The core column is about 2.5 cm in diameter and about 5 cm in length.
[0067] 2) Under the conditions of simulated underground confining pressure and pore pressure in the laboratory, measure the dynamic and static elastic parameters, elastic wave attenuation coefficient, dispersion effect and compressional ...
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The invention provides a method for carrying out shale gas reservoir evaluation and finding a dessert area for shale gas exploration and development comprehensively through comprehensive application of rock physics, log data and omnibearing or wide-azimuth three-dimensional seismic data. The method is characterized by analyzing the characteristics of the dessert area in a shale reservoir by applying comprehensive geophysical exploration technologies of laboratory rock geophysical measurement, log data comprehensive analysis, rock physical modeling, vertical seismic section data, omnibearing or wide-azimuth three-dimensional seismic data high precision surface layer comprehensive modeling static correction processing, prestack de-noising processing, amplitude relative fidelity processing, resolution enhancement processing which is carried out by utilizing well constraint and well seismic data to drive ground seismic data, fine excision, iteration velocity analysis, interval velocity field analysis, prestack depth migration processing, high resolution processing, azimuth classification processing, high-precision anisotropy processing, prestack and post-stack data inversion processing, and neural network analysis and the like, and thus gas bearing characteristic prospect of the shale gas reservoir is evaluated accurately and the dessert area for shale gas exploration and development is delineated.
Description
technical field [0001] The invention belongs to the application of geophysical exploration methods, which is a comprehensive application of petrophysics, logging data, omnidirectional or wide azimuth three-dimensional seismic data and vertical seismic profile data and other comprehensive geophysical exploration techniques to evaluate shale gas reservoirs and search for shale gas reservoirs. A method for rock gas exploration and development of sweet spots. 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 ...
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IPC IPC(8): G01V1/50
Inventor 余刚张宇生王熙明万小平金其虎程飞李可恩刘伟郭锐
Owner BGP OF CHINA NAT GASOLINEEUM CORP