Abstract:

From the viewpoint of polycyclic formation and accumulation of pe-troleum,the target for petroleum prospecting in Sichuan Basin and Or-dos Platform Downwarp has been discussed.It was pointed out that quitea number of unconformity and disconformity planes in the stratigraphical sequences within Sichuan Basin are important for petroleum accumulation.In oil prospecting work,the stress should be put on the piedmont down-warp zone of the Longmenshan Mountain,and the Triassic and Jurassic rocks should be considered as the target for searching oil.The Yangxinlimestone and its underlying rocks may bear only gas but no oil.According to the tectonic and stratigraphical characteristics,the cen-tral part of Majiatan-Shajingzi Uplift(i.e.the Yuanyang Lake area)with in the Ordos Platform Downwarp is an oil-promising area,and the Tianhuan Downwarp is a second best area in oil potentiality.The Liu-panshan Mountain,especially its northern part,must be one of the sig-nificant areas for future oil searching work.The Yikezhaomeng Upliftmay not contain much oil.