The reason of lower coal reservoir pressure in Lu'an coal mining area

Based on the fact of universally lower coal reservoir pressure in Lu′an Coal Mining Area,with the bury-thermal development history and hydr-state equation the development history of coal reservoir pressure is analyzed.It is suggested that one of reasons for lower coal reservoir pressure is fluid cubage shrink caused by coal reservoir temperature drop.The temperature drop is related to the normalization of old abnormal thermal field and tectonic uplift.