Abstract: Discrete cosine transform (DCT) is of relatively high accurate and numerical stability in the processing of gravity anomalies. The horizontal and vertical derivatives of the first order, the constant density single interface inversion, and Euler deconvolution technique based on the DCT method, are applied to process the gravity data of Line DB1 in periphery of Daqing prospect area. Euler deconvolution based on DCT reveals 14 faults, and the properties of the 7 deeper faults of them are analyzed. According to the inversed depth of crystalline basement and the characteristics of fault tracks, the profile is partitioned into a structural framework of 2 uplifts and 2 depressions, in which Qihulinhe depression is a superimposition basin of the depression in Paleocene(E) and the relic basin of the early Cretaceous period(K¹), while Kaibei depression seems to be a relic basin of K¹. After the comprehensive analysis of the characteristics of the investigation results, it is confirmed that the south and north part of Dun-Mi fault are the basin controlling faults.

Key words: DCT, characteristic of gravity field, crystalline basement, faulted structure, fracture of control basin