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Monitoring of coal-mine goaf based on 4d seismic technology

Applied Geophysics 2020年第1期17卷 54-66,168页

作者： Zhang Xian-Xu Ma Jin-Feng Li Lin Xi’an Research Institute of China Coal technology and Engineering Group Xi’an 710077China National&Local Joint Engineering Research Center of Carbon Capture and Storage technology Department of GeologyNorthwest UniversityXi’an 710069China

The range of coal-mine underground goaf has continuously expanded over ***,fracture,and deformation zones have also changed,thereby inducing coal-mine water inrush and other environmental *** this study,4 d seismic monitoring technology that is effective in reservoir development was used to monitor abnormal changes in coal-mine underground goaf to explore the feasibility of the *** a coal mine in Hancheng,Shaanxi as an example,we used the aforementioned technology to dynamically monitor the abnormal changes in the *** on the 4 d seismic data obtained in the experiment and the abnormal change characteristics of the coal-mine goaf,the method of 4 d seismic data processing in reservoir was improved.A set of 4 d data processing flow for the goaf was established,and the anomalies in the surface elevation and overlying strata velocity caused by collapse were *** have made the following improvements to the method of 4 d seismic data processing in the reservoir:(1)the static correction problem caused by the changes of surface elevation and destruction of the low-velocity layer has been solved through fusion static correction to comb the low-frequency components of elevation statics with the high-frequency components of refraction statics;(2)the problem of overlying strata velocity changes in the goaf caused by collapse has been solved through the velocity consistency method;(3)the problem of reflection event pull-down in the disturbance area has been solved through space-varying moveout correction based on cross-correlation;and(4)amplitude anomalies in the coal seam caused by the goaf have been addressed using the correction method of space-varying *** show that the 4 d seismic data processing and interpretation method established in this study is reasonable and effective.

关键词： 4d seismic technology coal mining goaf difference map cross-equalization processing

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