首页|Chemical,carbon and sulfur isotopic compositions constrain the origin of Upper Carboniferous-Lower Triassic gases in eastern Sichuan Basin,SW China

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

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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-T,f)gases in the surrounding of the Kaijiang-Liangping area show volatile organic sulfur compounds(VOSCs)δ34S values close to those of the associated H2S,and may have been altered by methane-dominated TSR,resulting in positive shift in methane δ13C1 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 δ34S 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 δ34S 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.

Sulfur isotopesVolatile organic sulfur compoundsThermochemical sulfate reductionSichuan BasinGas-source rock correlation

Chunfang CAI、Ilya KUTUZOV、Wenhua MEI、Daowei WANG、Bing LUO、Shipeng HUANG、Bing HE、Alon AMRANI

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China University of Petroleum,National Key Lab Petroleum Resource & Engineering,Beijing 102249,China

State Key Laboratory of Lithospheric and Environmental Coevolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Earth Sciences,The Hebrew University,Jerusalem 91904,Israel

Yulin University,Yulin 719000,China

Research Institute of Exploration and Development,Southwest Oil & Gas Field Company,PetroChina,Chengdu 610051,China

PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China

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2024

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子:1.002
ISSN:1674-7313
年,卷(期):2024.67(10)