The main source rocks are Wudanggou and Changhangou Formations of Middle-Lower Jurassic, the Lower Cretaceous Guyang Formation.

• 经野外露头剖面和钻井岩性分析，下、侏罗统五当沟组、汉沟组和下白垩统固阳组发育深湖半深湖相泥()、质泥岩和泥灰岩，是区内主要的烃源岩。