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Fluid inclusion and stable isotopic studies of thermochemical sulfate reduction: Upper permian and lower triassic gasfields, northeast Sichuan Basin, China
Li, Kaikai1,2,3,4; George, Simon C.3,4; Cai, Chunfang5,6,7; Gong, Se8; Sestak, Stephen8; Armand, Stephane8; Zhang, Xuefeng9
2019-02-01
发表期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
卷号246页码:86-108
摘要Fluid inclusions hosted in different stages of TSR-derived diagenetic minerals are expected to record compositions and isotopes of paleo-fluids at the time of trapping during different TSR extents. Here we report the first set of data on carbon isotopes of CH4 and CO2 and hydrogen isotopes of H2O trapped in fluid inclusions in TSR calcites. We find that the NE Sichuan sour dolostones have initially experienced oil-and wet gas-dominated TSR, as recorded in H2S-bearing oil inclusions with lower homogenization temperatures (T-h) values (e.g., <= 137 degrees C) and the coexistence of C2+ hydrocarbon gas and H2S in fluid inclusions. The subsequent dry gas-dominated TSR occurred in higher reservoir temperatures (> about 161.5 degrees C) when most C2+ hydrocarbons were exhausted. The three-stage TSR resulted in CH4 delta C-13 values becoming progressively heavier from -46.7 parts per thousand to -29.6 parts per thousand, H2O delta H-2 values shifting negatively from -36.4 parts per thousand to -67.8 parts per thousand and salinities decreasing to as low as 0.9 wt% NaCl. The dry gas-dominated TSR reaction seems to be the most efficient at water production, which, however, was limited by available reactive sulfate, and shows significant differences within the reef and shoal reservoirs along the platform margin, and the anhydrite-bearing reservoirs in the paleo-lagoon area. The TSR reaction within the porous shelf-margin reservoirs is capable of causing carbonate dissolution owing to high porosity and good connectivity of the micropore network and the resulting mass transport away from TSR sites. This resulted in CO2 delta C-13 positive shift from -9.3 parts per thousand to +6.3 parts per thousand, and a positive correlation of this parameter with T-h. In contrast, in the tight anhydrite-bearing reservoirs, slow mass transport and quick saturation of calcium and dissolved CO2 in the pore waters is expected to precipitate TSR calcite near the anhydrite crystals, resulting in calcite crystals having more depleted delta C-13 values (-1.4 parts per thousand to -18.9 parts per thousand). This study shows that there are essential differences in the process and effects of TSR reaction due to geological differences in the settings of TSR sites. (C) 2019 Elsevier Ltd. All rights reserved.
关键词Fluid inclusion TSR Carbonate dissolution Carbon isotope Hydrogen isotope Sichuan Basin
DOI10.1016/j.gca.2018.11.032
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study
关键词[WOS]CARBONATE GAS-RESERVOIRS ; LIGHT-HYDROCARBON GASES ; FEIXIANGUAN FORMATION ; SEDIMENTARY BASIN ; HYDROGEN-SULFIDE ; FORMATION WATERS ; KHUFF FORMATION ; NATURAL GASES ; TARIM BASIN ; ORIGIN
语种英语
资助项目National Natural Science Foundation of China[41572129] ; National Natural Science Foundation of China[41730424] ; Special Major Project on Petroleum Study[2017ZX05008003-040]
资助者National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000455651400005
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90182
专题油气资源研究院重点实验室
通讯作者Li, Kaikai; Cai, Chunfang
作者单位1.China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China
2.Minist Educ, Key Lab Marine Reservoir Evolut & Hydrocarbon Enr, Beijing, Peoples R China
3.Macquarie Univ, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia
4.Macquarie Univ, MQMarine Res Ctr, N Ryde, NSW 2109, Australia
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources, Beijing 100029, Peoples R China
6.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
7.Yangtze Univ, Key Lab Oil & Gas Resources & Explorat Technol, Wuhan 430100, Hubei, Peoples R China
8.CSIRO Energy Business Unit, N Ryde, NSW 2113, Australia
9.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China
推荐引用方式
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Li, Kaikai,George, Simon C.,Cai, Chunfang,et al. Fluid inclusion and stable isotopic studies of thermochemical sulfate reduction: Upper permian and lower triassic gasfields, northeast Sichuan Basin, China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,246:86-108.
APA Li, Kaikai.,George, Simon C..,Cai, Chunfang.,Gong, Se.,Sestak, Stephen.,...&Zhang, Xuefeng.(2019).Fluid inclusion and stable isotopic studies of thermochemical sulfate reduction: Upper permian and lower triassic gasfields, northeast Sichuan Basin, China.GEOCHIMICA ET COSMOCHIMICA ACTA,246,86-108.
MLA Li, Kaikai,et al."Fluid inclusion and stable isotopic studies of thermochemical sulfate reduction: Upper permian and lower triassic gasfields, northeast Sichuan Basin, China".GEOCHIMICA ET COSMOCHIMICA ACTA 246(2019):86-108.
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