1. CBM and Gas Storage Division of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China; 2. Geological Research Center, BGP, CNPC, Zhuozhou, Hebei 072751, China; 3. Exploration and Development Research Institute, Huabei Oilfield Company, PetroChina, Renqiu. Hebei 062552, China
Abstract：Permeability is an important parameter affecting the production of coalbed methane. There is a certain power exponential relationship between geostress and permeability. But the geostress prediction based on the curvature of seismic data can not accurately characterize the permeability distribution law of coal strata. In this study, taking coal strata in the Qinshui Basin as an example, the geostress was predicted by using the curvature of seismic data, and the fault development area was precisely predicted by using the intrinsic structural coherence technology; then the unreasonable areas of geostress prediction were eliminated by fusing geostress and coherent attribute volume; finally, the geostress was converted into permeability according to the power exponential relationship between permeability and geostress. The predicted results of this method are in good agreement with actual drilling data. They provide references to CBM exploration and development.
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