The Control of Structure on Coalbed Methane (CBM) Enrichment in Zhengzhuang Block of Qinshui Basin, China

This paper discusses the structural characteristics and tectonic evolution, as well as the accumulation history and preservation conditions of coalbed methane (CBM) in Zhengzhuang block located in southeastern Qinshui basin. Deformed by the Hercynian, Indo-China, Yanshan and Himalayan four tectonic movements, the study area emerges the structure pattern that folds developed in northwest of the block, while faults in the southeast. The area near the syncline axis is the favorable region of CBM accumulation with good sealing condition. The Sitou fault has an effect on the diffusion of CBM. The geological controls of gas accumulation were concluded by a conceptual model, which provides a basis for further exploration and development.