Research on high-precision gravity scratch analysis and structure features of Yili Basin, north-west China

It is of great importance to study the structural division of Yili Basin in north-west China to guide oil and gas exploration. In this paper, high-precision gravity area measurement is carried out, and the gravity scratch analysis method is employed to research the Northern Depression Belt of Yili Basin. Based on surface scratch recognition principles, the ridge coefficient and the edge coefficient of gravitational potential field are extracted. And a clearer understanding of fracture characteristics and structural boundaries is obtained. Faults F-1, F-2, F-3, and F-4 control the boundaries between Baishidun Sub-Bulge and its peripheries; meanwhile, Faults F-5 and F-6 control the internal structural framework of Baishidun Sub-Bulge and its hydrocarbon migration. Fault F-4 is the structural boundary between Baishidun Sub-Bulge and Gongliu Sub-Sag. The result shows that the gravity scratch analysis method can get a good application in small-scale structure recognization.