考虑煤储层自调节效应的物质平衡方程的推导

uring the water draining and gas production in the coal seam，the hydrodynamic pressure will decrease, and the matrixes will expand, so the crannies will be compressed; And at the same time, the matrixes will shrink in response to gas desorption, so the crannies will be splayed (self-adjusting function). The variance of crannies will be decided by the difference of the two effects. At present, researches on this matter mainly converge in the aspect of permeability’s performance analysis, while in the aspect of material-balance research, this matter has not been considered. This article has taken account of this matter, and derived material –balance equation for coal seam. In addition, the article has made preliminary research on how to use well the material-balance techniques.