Generation conditions of continental shale gas in Biyang Sag, Nanxiang Basin

Generation conditions of shale gas from the Hetaoyuan Formation in the Biyang Sag of the Nanxiang Basin were systematically studied according to the U.S.A marine shale gas evaluation index for the first time.The Hetaoyuan Formation extends widely with big thickness of single layer in the region.The TOC content is high and the thermal evolution degree is equivalent to that of Devonian basins in the U.S.A.The responses of gas-bearing shale in well logging are obvious.Micro-fracture and micro-pore are well-developed in shale,providing good condition for reserving.Gas is well preserved in shale.The high content of brittle minerals such as quartz is favorable for reservoir fracturing.Shale gas exploration prospect is bright in the Biyang Sag where is favorable for shale gas forming and the potential resource of shale gas is huge.