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Application of coalbed methane accumulation zone seismic prediction technology based on main geological controlling factors

Chen Yong,Chen Hongde,Guan Da,Cai Yuhua,Liu Yuqi,Zheng Silian Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China  
Aiming at the characteristics of coalbed methane and the difficulties for seismic prediction,we proposed an integrated seismic prediction method by using multi-parameters to identify coalbed methane enrichment zone based on main geological controlling factors.Taking SHS area as target,by geologic analysis,we concluded six main controlling factors for the accumulation of coalbed methane,including structure pattern,coalbed thickness,lithology of overlays,sedimentary environment(coal quality),fractures development and coalbed permeability.Then,seismic structure interpretation,seismic attributes analysis,seismic acoustic impedance inversion,seismic facies analysis,ESP fracture detection technique and seismic elastic parameters inversion is chosen to separately analyze the above controlling factors.After setting weight coefficients of prediction results of all the seismic techniques,AHP evaluation is conducted to realize the comprehensive prediction of coalbed methane enrichment zone of SHS region and the prediction result shows good consistency with well drilling data.
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