Marine Shale Gas Differential Enrichment Structure Models in South China

Most of the marine shale strata in South China have undergone poly-cycle complex structural superimposition and reformation after hydrocarbon generation, forming many types of structural styles, and the enrichment degree of shale gas in different styles is obviously different.Based on the analysis, testing and the detailed anatomy of the logging and seismic data in dozens of shale gas exploration wells in South China, and more than 300 development wells in the Fuling shale gas fields, a set of direct and indirect indicators for shale gas bearing evaluation in South China are established combining with actual drilling results.Based on the typical background of extrusion structure in South China, focusing on the structural tightness (broad, narrow and steep, fractured) and structural forms (positive, negative and oblique), 24 structural models representing the differential enrichment of shale gas are proposed.Under the premise of the same macroscopic structural background, the broad structural model is the most favorable mode for shale gas enrichment, followed by the narrow-steep type, and the fractured type is the worst.