In the Q-F-L graph, the plotted points of quartz, feldspar and lithoclast contents of Cretaceous sandstone-mudstone cored from wells are mainly located in foreland basin area.

• 钻井岩石中白垩系砂泥岩的石英、长石和岩屑含量的Q -F -L图解投点主要位于前陆盆地区;