Coal Measures
煤系烃源岩
煤系
含煤地层
含煤岩系
煤系地层
煤矿
上石炭系
煤层
燕山运动
煤层组
煤田
含煤层
合煤岩系
硬质高岭土
coal measures and red beds
coal measures depositional environment
Coal Measures Kaolinite
coal measures reservoir
coal measures source rock
coal-measures of the Shanxi Formation
coal-measures source rock
Coal-measures source rocks
hard kaolin (kaolinite) in coal measures strata