Abstract:

The microcosmic dynamical energies of coalbed gas reservoir-forming action mostly showed in two aspects that one was the pore-fracture system, and the other was the hydrocarbon-generated action and the gas-storage action. Taking the coal reservoir in Qinshui Basin as a case, the paper went deep into anatomising the pore-fracture system and its developing evolution, the hydrocarbon-generated action and energy accumulation-emission, and clarified the controls of various microcosmic dynamical energies to coalbed gas reservoir formation. The researching results indicated that the tectonic action had obvious controls to coal reservoir permeability, and the energy accumulation of hydrocarbon-generated action was the important power to the cap-rock breaking action, and the energy emission mostly showed in the forming and developing of the pore-fracture system According to the aforementioned research, we could find the geological regionalization of coalbed gas reservoir formation in Qinshui Basin, which is shown that the advantaged area in the south of the Basin is Yangcheng and north Jincheng, including Panzhuang, Fanzhuang and Zhengzhuang; the advantaged area in the middle of the Basin is Anze-Qinyuan region which lies in the centre and south of the western slope of the Basin; in the north of the Basin, the likely advantaged area is the southeast Shouyang which lies in the middle of northeast Yuci and southwest Yangquan.

Key words: coalbed gas, reservoir-forming action, energy homeostasis system, microcosmic dynamical energy, Qinshui Basin