The Jurassic is built of continental clastic deposited sediments in the western Sichuan foreland basin. Its deltaic depositional system is branched out into lake fan delta system and lake delta system. The lake fan delta system, which mainly existed in the Upper Jurassic Suining Formation and Lianhuakou Formation, is made up of fan delta plain subfacies, fan delta front subfacies and prodelta subfacies. The lake delta system, which mainly distributed in the Upper Jurassic Penglaizheng Formation and so on, c...