Analysis of Favorable Exploration Area in the Central Uplift of South Yellow Sea Basin Based on Gravity and Magnetic Data

The Mesozoic-Paleozoic marine strata are well developed in the Central Uplift of South Yellow Sea Basin, and are the main exploration feld at present. The scarce of exploration wells and 3D seismic data, together with the poor quality of 2D seismic data have hindered the exploration process in the study area. One of the geological problems to be urgently solved is the recognition of the distribution and thickness of the Mesozoic-Paleozoic marine strata. Based on the gravity and magnetic data available, combined with the interpretation and inversion of 2D seismic data and drilling information from the adjoining wells, a series of geological maps were mapped, including typical tectonic sections, depth maps of major geological interface, thickness maps of upper and lower Paleozoic. Based on the classifcation and interpretation of gravity and magnetic anomalies occurring in the Central Uplift and the comparison with SuBei Basin, the authors summarized the corresponding relation between the favorable exploration area and gravity and magnetic anomaly. Accordingly, the authors pointed out that the Paleozoic is thick in the area with low gravity and magnetic anomaly, and is to be the favorable exploration area. It gives another idea for predicting the favorable exploration area in the Central Uplift.