Analysis on Physical Properties Differences and Origin Mechanism of Coal Reservoirs in Qianxi District

In order to explore the potential of coalbed methane exploration and development in Qianxi District, based on various tests, the differences in physical pr operties ( such as the pore structure, adsorptivity, porosity and permeability, etc.) of coal reservoirs in two typical areas ( Zhina and Panguan) were systematically analy zed, and the origin mechanism of their differences were furthermore deeply analyzed.The results show that the differences in physical properties of coal reservoirs in Qi anxi District are mainly controlled by the evolution degree of coal reservoirs. The evolution degree is dominated by the sedimentary and burial history as well as the tect onic thermal events afterwards. The sedimentary and burial history determines the differences in coal ranks between Zhina area and Panguan area, while the tectonic t hermal events are the main controlling factors of their internal differences in coal ranks. Resulting from the various sedimentary and burial history or tectonic thermal ev ents, different evolution processes and physical- chemical structures generate, which in return determine the physical properties of coal reservoirs in Qianxi District.