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《Chinese Journal of Geophysics》 2005-06
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Theory and application of AVO for detection of coalbed methane——A case from the Huainan coalfield

PENG Su-Ping,GAO Yun-Feng,YANG Rui-Zhao,CHEN Hua-Jing,CHEN Xin-PingSchool of Safety and Resource Engineering,China University of Mining and Technology,Beijing 100083,China  
Based on the geological theory of coalbed methane accumulation and contrast between the preserving mechanism of methane in coalbeds and that of natural gas in sandstone reservoirs,we propose a theory for detecting methane accumulation targeting at cleats and fractures in coalbed with the AVO technique.According to AVO modeling,amplitudes of the coalbed top interface decrease with the offset increasing.The AVO responses of coal of different structures are considerably different.Both intercept and gradient on the coalbed top interface increase with the density of cleats and fractures increasing.It also shows that the tuning effect of coalbed thickness can impair its AVO response.Then the AVO technique is practiced in the Huainan coalfield,and methods for seismic data AVO procession and interpretation are studied.The result shows that AVO attributes such as gradient and pseudo Poisson's ratio reflectirity are sensitive to gas accumulation and density of cleats and fractures in coalbeds.Dangerous zones with methane accumulation in the study area have been predicted according AVO anomalies.And the result is of engineering value for methane prevention and control.Furthermore,the AVO technique has been confirmed practicable in detection of cleat and fracture density and gas accumulation in coalbeds.
【Fund】: 创新研究群体基金(50221402);; 国家杰出青年基金项目(50025413);; “十五”国家科技攻关重点项目(2001BA803B0403);; 973项目(2002cb211707)资助
【CateGory Index】: TD712;
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