For the western depression belt, lacustrine mustone in Paleocene Yueguifeng Formation and littoral coal measures in Lingfeng and Mingyuefeng Formations constitute main source rocks.

• 不同时代盆地构造类型和大地构造位置控制了盆地烃源岩发育层位及平面分布：西部坳陷带以古新统月桂峰组湖相泥岩和灵峰组、明月峰组滨海相煤系地层为主要烃源岩；