摘要
伊敏盆地五牧场区大磨拐图河组煤变质梯度△Ｒ°ｍ／１００＝０．５４％，从褐煤到贫煤均有发育。地震资料和围岩蚀变证实在大磨拐图河组之下发育一小型岩株，其埋深为２０００ｍ左右。岩浆热力引起的高温低压变质条件导致煤中孔隙裂隙的充分发育。含煤段之上厚３００ｍ的泥岩有效阻止煤层气的逸散，煤储层可具有较高的含气饱和度。五牧场区烟煤储量丰富，单层煤厚度多在２ｍ以上，煤累计厚度达３０ｍ以上，富煤带与中变质煤区大部分重叠。煤层埋深３５０ｍ～１０００ｍ，倾角在１５°以内，具备较好的煤层气勘探开发条件。
There are brown to low volatile bituminous in Wumuchang, Yimin basin northeastern Chi-na. Metamorphic gradient,△R°m/100m.equals to 0.54%. There is an intrusive body with the depthof about 2000m under coal-bearing strata proved by the seismic data, and erosion and metamorphicfeaturs in surrounding rocks . The pore～fracture systm of coal reservoirs, which were formed in themetamorphic environment with low pressure and high temperature are very developmental. The coalreserviors may form a high gas saturation coefficient since the mudrock at the top is good to preventgas escaping. Coal-rich zone covers most of midum-low volitale bituminous area in Wumuchang. Mostof the coalseams are more than 2m thick and the total thickness is over 30m. The depth of the maincoalseams is about 350 to 1000m with the dip of less than 15 degrees. the geological conditions of Wu-muchang are suitable to the recovery of methane from coal beds.
出处
《中国煤田地质》
1996年第4期34-37,共4页
Coal Geology of China
关键词
煤
变质作用
煤层气
天然气
地质特质
metamorphic environment with low pressure and high temperature, geological feature ofcoal bed methane, Wumuchang, Yimin basin
