Coupling effect of tectonic conditions to permeability of high rank coal reservoirs

摘要

Taken high rank coal reservoirs in the Qinshui Basin, Shanxi, China, based on tectonics setting,system fracture observation, abound well-testing permeability, coupling effect of tectonic setting to permeability are analyzed comprehensively.The results indicate that the structure styles play an important control to permeability of high coal reservoirs, tectonic curvature, ranging from 0.05 to 0.2 × 10-4/m,is favorable of enhancing permeability, the permeability of high rank coal increase dramatically in exponent with the rise of the main stress difference of modern tectonic stress field, however, with the rise of the burial depth, the control effect of modern tectonic stress field to reservoirs permeability below the critical burial depth will become weaker and weaker, whereas vertical stress effect will increase..