摘要：Methane dominated gas is one of the cleanest energy resources; however, there is no direct method to determine its source rock. Natural gases produced from the eastern Sichuan Basin together with seismic data were studied for their sources and secondary alteration by thermochemical sulfate reduction (TSR). Our results demonstrate that Upper Permian to Lower Triassic (P3ch-T1f) gases in the surrounding of the Kaijiang-Liangping area show volatile organic sulfur compounds (VOSCs) delta 34S values close to those of the associated H2S, and may have been altered by methane-dominated TSR, resulting in positive shift in methane delta 13C1 values with increasing TSR extents. Other (or group 2) gases produced from the P3ch-T1f reservoirs from the southern area and the Upper Carboniferous to Middle Permian (C2h-P2q) from the eastern Sichuan Basin are not significantly changed by TSR, show similar delta 34S values between the kerogens and some VOSCs, and may have been derived from the Lower Silurian and Middle Permian source rocks. This study demonstrates a case for the first time showing the delta 34S values of VOSCs can be used as a tool for direct correlation between non-TSR altered gas and source rocks. Methane-dominated gas pools can be found using gas and source rock geochemistry combined with seismic data.

关键字：Sulfur isotopes; Volatile organic sulfur compounds; Thermochemical sulfate reduction; Sichuan Basin; Gas-source rock correlation

ISSN号：1674-7313

卷、期、页：卷67期10：3169-3185

发表日期：2024-10-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）

发表期刊名称：SCIENCE CHINA-EARTH SCIENCES

参与作者：Kutuzov, Ilya,Mei, Wenhua,Wang, Daowei,Luo, Bing,Huang, Shipeng,He, Bing,Amrani, Alon

第一作者：蔡春芳

论文类型：期刊论文

论文概要：蔡春芳,Kutuzov, Ilya,Mei, Wenhua,Wang, Daowei,Luo, Bing,Huang, Shipeng,He, Bing,Amrani, Alon，Chemical, carbon and sulfur isotopic compositions constrain the origin of Upper Carboniferous-Lower Triassic gases in eastern Sichuan Basin, SW China，SCIENCE CHINA-EARTH SCIENCES，2024，卷67期10：3169-3185

论文题目：Chemical, carbon and sulfur isotopic compositions constrain the origin of Upper Carboniferous-Lower Triassic gases in eastern Sichuan Basin, SW China