Seismic-potential field response characteristics and identification of basement lithology of the northern South China Sea basin

We selected 18 outcrop sections along the southeastern coast and acquired 245 rock samples which may occur in South China Sea Basin basement.Their density and magnetic susceptibility are measured and the density-magnetic susceptibility crossplot is established that is used to constrain the geological interpretation of seismic profiles through wells and potential anomalies.Then,we have summarized the seismic-potential field response characteristics of basement rocks,which contain volcanic rock,intrusive rock,metamorphic rock and sedimentary rock,in 4 categories and 11 sub-categories in the northern South China Sea Basin.Application of the geological-geophysical interpretation model to each main profile in South China Sea Basin,the basin basement lithology mapping is well achieved.So,this method,from the section of basin margin to the inner basin and from the measure of rock density and magnetic susceptibility to the geological-geophysical interpretation,has proven to be effective in the South China Sea Basin where the data acquisition is difficult and geological condition is complex.And this study also has a certain reference value for other basins.