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  4. 中国科学院油气资源研究重点实验室
Massive dolomitization driven by MgSO4-rich seawater and its effects on thermochemical sulfate reduction, Upper Permian Changxing Formation, northeastern Sichuan, China

文献类型：期刊论文

作者Li, Kaikai2,3; Cai, Chunfang1; Tan, Xianfeng4; Jiang, Hua5; Fan, Junjia5
刊名ENERGY EXPLORATION & EXPLOITATION
出版日期2022-03-16
页码29
ISSN号0144-5987
关键词H2S TSR dolomitization penesaline seawater C-O-Sr isotopes fluid inclusion Permian Sichuan Basin
DOI10.1177/01445987221083758
英文摘要Massive dolostones replacing build-ups and containing H2S of thermochemical sulfate reduction (TSR) origin occur in the Upper Permian reef and bank deposits, northeastern Sichuan, China, despite the absence of gypsum or anhydrite deposits, which are usually present in TSR cases. Fluid chemistry from fluid incluions and delta 13C, delta 18O and 87Sr/86Sr values from different diagenetic phases were measured to determine the dolomitization regime, and to assess the relationships between the occurrence of dolomitization and H2S accumulation. Dolomitization was initiated by seawater with slightly increased salinities (penesaline) at shallow depths prior to chemical compaction. The micro- to fine-crystalline cloudy dolomite formed with relatively high Na and Sr contents, and with delta 13C, delta 18O and 87Sr/86Sr values (2.2 parts per thousand similar to 4.8 parts per thousand, -3.9 parts per thousand similar to-5.0 parts per thousand and 0.70724 similar to 0.70746, respectively) inherited from seawater. The evaporation of Permian seawater in back-reef and inter-reef lagoons during sea-level fall and the subsequent seepage reflux into reef-beach bodies led to greater Mg2+ and SO42- concentrations in higher-salinity pore waters. Further massive dolomitization was promoted by compactional flow of hotter residual seawater at shallow to intermediate depths and resulted in the formation of fine- to medium-crystalline clean dolomite with lower Na and Sr contents, more depleted delta O-18 values (-5.1 parts per thousand similar to-6.0 parts per thousand), and delta C-13 (2.5 parts per thousand similar to 4.8 parts per thousand) and Sr-87/Sr-86 values (0.70726 similar to 0.70741) similar to those of the coeval seawater. The relatively closed hydrodynamic system during burial facilitated SO42- preservation. The whole dolomitization process enriched porewater SO42-, which have been almost exhausted by subsequent TSR, accounting for the high present-day concentrations of H2S. The output of this study shows that similar scenarios involving dolomitization driven by condensed MgSO4 seawater and H2S accumulations can occur in evaporite-free settings across a broad range and deserves special attention during deep oil/gas exploitation.
WOS关键词TRIASSIC FEIXIANGUAN FORMATION ; CARBONATE GAS-RESERVOIRS ; HYDROGEN-SULFIDE ; HYDROTHERMAL DOLOMITIZATION ; PLATFORM CARBONATES ; POROSITY EVOLUTION ; OXYGEN ISOTOPES ; FLUID-FLOW ; SEA-WATER ; BASIN
资助项目National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities[41972154] ; Fundamental Research Funds for the Central Universities[2652019104]
WOS研究方向Energy & Fuels
语种英语
出版者SAGE PUBLICATIONS INC
WOS记录号WOS:000772943600001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities
源URL[http://ir.iggcas.ac.cn/handle/132A11/105021]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Li, Kaikai
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources, Beijing, Peoples R China
2.China Univ Geosci Beijing, Sch Energy Resource, Beijing 100083, Peoples R China
3.Minist Educ, Key Lab Marine Reservoir Evolut & Hydrocarbon Enr, Beijing, Peoples R China
4.Chongqing Univ Sci & Technol, Coll Petr & Nat Gas Engn, Chongqing, Peoples R China
5.CNPC, Key Lab Basin Struct & Hydrocarbon Accumulat, Res Inst Petr Explorat & Dev, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Kaikai,Cai, Chunfang,Tan, Xianfeng,et al. Massive dolomitization driven by MgSO4-rich seawater and its effects on thermochemical sulfate reduction, Upper Permian Changxing Formation, northeastern Sichuan, China[J]. ENERGY EXPLORATION & EXPLOITATION,2022:29.
APA Li, Kaikai,Cai, Chunfang,Tan, Xianfeng,Jiang, Hua,&Fan, Junjia.(2022).Massive dolomitization driven by MgSO4-rich seawater and its effects on thermochemical sulfate reduction, Upper Permian Changxing Formation, northeastern Sichuan, China.ENERGY EXPLORATION & EXPLOITATION,29.
MLA Li, Kaikai,et al."Massive dolomitization driven by MgSO4-rich seawater and its effects on thermochemical sulfate reduction, Upper Permian Changxing Formation, northeastern Sichuan, China".ENERGY EXPLORATION & EXPLOITATION (2022):29.

入库方式： OAI收割

来源：地质与地球物理研究所

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