Application of modeling technology for surface igneous rocks in Hainan, China

Three sets of igneous rocks are developed in the Hainan region of China, including surface, shallow, and deep layers. Due to the shielding effect of surface igneous rocks, multiple interferences such as scattering occur, resulting in poor seismic data quality, first arrival wave train layer, and poor seismic imaging.This article comprehensively applies magnetic methods, transient electromagnetic resistivity, uphole, and core element assay data to jointly calibrate the distribution range and depth of surface igneous rocks, establish accurate models of the top and bottom interfaces and thickness of surface igneous rocks, and finely implement the spatial distribution of surface igneous rocks. The model was used to finely design the excitation well depth in the surface igneous rock area, guiding the precise first arrival picking and static correction calculation, and improving seismic data imaging.