Mapping the deep upper Paleozoic based on joint of 3D MT-gravity: A case study

Abstract

Summary The existence of deep targets is of significant importance in basin exploration, especially in areas where few seismic datasets exist, and where it is a challenge to use magnetotelluric (MT) and gravity exploration to delineate the distribution of potential deep targets. Taking basin W as an example, this paper demonstrates that joint 3D MT and gravity exploration is effective for determining a basin’s deep hydrocarbon potential in a rapid and economic manner. This method is particularly useful for basins which have few seismic data, but are of interest for oil and gas exploration. Based on highprecision 3D MT data acquisition, which uses a 3D small-bin grid, datum static correction, and a 3D MT inversion method, the data accuracy has improved markedly, and the 3D resistivity data volume can be realized. Secondly, we can develop a layered geological color model with the electro-logging data, and set up a layered geological model. Finally, we adopt the interactive 3D MT and gravity inversion to further modify the previous geologic interpretation, and to delineate the distribution of potential deep targets.