The identification of Pre-Sinian graben-horst structures in the southern Sichuan and northern Guizhou region and their petroleum geological significance

Using an  Magnetotelluric profile from the southern margin of the Sichuan Basin, we conducted an electrical structure study of the southern Sichuan and northern Guizhou region that the profile traverses, employing magnetotelluric sounding processing and inversion. A wealth of oil and gas exploration data within the Sichuan Basin indicates that the Pre-Sinian rift has a significant controlling effect on the Anyue-Deyang rift trough in the Sichuan Basin. Through comprehensive comparative analysis of the MT profile with the depth, seismic data, other MT data, and physical properties of the Pre-Sinian system within the Sichuan Basin, it is believed that the southern Sichuan and northern Guizhou region also exhibits a Pre-Sinian rift structure similar to the typical ones found within the Sichuan Basin. This finding has certain indicative significance for subsequent oil and gas resource exploration in the region and also deepens our understanding of the Neoproterozoic tectonic evolution in this area.