Abstract: The lower part in Shiwu fault depression and Changling sag includes Yingcheng Formation(K₁yc)、Shahezi Formation(K₁sh)and other lower formations.The thickness of the main source rocks is large and its hydrocarbon generation quantity is about 86%-90% of the total.The sum of gas resources is 10.4×10⁸t oil equivalent and the resource abundance is(7.64-15.09)×10⁴t /km².The deeper traps formed in the early stages with large areas could have priority condition to accumulate oil and gas.Discovery of this kind of accumulation is still in its early stage because of the olw exploration degree.There is favourable potential for petroleum exploration in the area.