Located at the slope of an ancient structure

the weak reformation of the structure in the north central part of Huaguoping composite syncline in the region of Hunan

westernHubeiandthe central part of Sangzhi-Shimen composite syncline is a favorable region for exploring a primary oil and gas reservoir. Located below the slope of the ancient structure

the weak reformation of the structure in southern Huaguoping composite syncline and western Sangzhi-Shimen composite syncline is expected to find an inherited oil and gas reservoir. Only a reconstructive type oil and gas reservoir can be found in the remaining lower part of the oil and gas generation assemblage in the center of Yidu- Hefeng composite syncline and the upper part of the oil and gas generation assemblage of the central composite syncline due to intensively reformed by the tectonic movement and the Silurian roof rock being eroded.