Lower-Middle fresh lacustrine shale and coal measures with huge thickness have been found in the petroleum system of the northern Qaidam basin. 柴达木盆地北缘侏罗系含油气系统具有巨厚的下侏罗统湖相泥岩和中侏罗统煤系地层。
These deposits are in unconformable contact with the underlying coal-bearing strata of the Shahezi Formation. 矿床与下伏沙河子组煤系地层呈不整合接触。
