The early Middle Jurassic was an major coal-forming period in the region, when the Lower Yaopo Formation of lacustrine-deltaic and swamp facies was deposited.
中侏罗世早期是全区重要的成煤期，下窑坡组为湖泊—三角洲及沼泽相。
Hydrocarbon source as a first important pool-forming condition, there is no any difference between marine and continental facies, oil-pool and gas-pool as well as where it comes from.
烃源作为成藏的首要条件，没有陆相、海相之分，没有地域之别，也没有油藏、气藏的不同。
Hydrocarbon source as a first important pool-forming condition, there is no any difference between marine and continental facies, oil-pool and gas-pool as well as where it comes from.
烃源作为成藏的首要条件，没有陆相、海相之分，没有地域之别，也没有油藏、气藏的不同。
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