Gravity anomaly characteristics and basin geological structure in Wan’an Basin

In view of the characteristics of low resolution and weak signal of marine gravity data, the satellite gravity in the study area is separated from each other in multi-space, and the separated anomalies are extended downward iteratively to obtain multi-depth high-resolution gravity anomalies. Apparent density inversion, linear structure enhancement processing, and basement interface inversion of gravity anomalies are carried out. Geophysical analysis of deep structure, fault structure identification, basement structure, and structural division of sedimentary basins are also carried out. Based on the comprehensive analysis of gravity anomalies, it is considered that the basin structure is mainly controlled by early SN, NE, and NNE faults, and the later NW faults have obviously reformed the southern part of the basin. The basin is mainly composed of 4 NE tectonic zones, which have been transformed into 12 structural areas due to the later reformation. This multi-attribute analysis of gravity anomalies is based on the rationality of the structural division and the stronger identification of the secondary tectonic zones, providing a more detailed geophysical basis for further oil and gas exploration in the Wan’an Basin.