IGGCAS OpenIR  > 油气资源研究院重点实验室
Massive dolomitization driven by MgSO4-rich seawater and its effects on thermochemical sulfate reduction, Upper Permian Changxing Formation, northeastern Sichuan, China
Li, Kaikai1,2; Cai, Chunfang3; Tan, Xianfeng4; Jiang, Hua5; Fan, Junjia5
2022-03-16
Source PublicationENERGY EXPLORATION & EXPLOITATION
ISSN0144-5987
Pages29
AbstractMassive 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.
KeywordH2S TSR dolomitization penesaline seawater C-O-Sr isotopes fluid inclusion Permian Sichuan Basin
DOI10.1177/01445987221083758
Funding OrganizationNational 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
WOS KeywordTRIASSIC FEIXIANGUAN FORMATION ; CARBONATE GAS-RESERVOIRS ; HYDROGEN-SULFIDE ; HYDROTHERMAL DOLOMITIZATION ; PLATFORM CARBONATES ; POROSITY EVOLUTION ; OXYGEN ISOTOPES ; FLUID-FLOW ; SEA-WATER ; BASIN
Language英语
Funding ProjectNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities[41972154] ; Fundamental Research Funds for the Central Universities[2652019104]
Funding OrganizationNational 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
WOS Research AreaEnergy & Fuels
WOS SubjectEnergy & Fuels
WOS IDWOS:000772943600001
PublisherSAGE PUBLICATIONS INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105021
Collection油气资源研究院重点实验室
Corresponding AuthorLi, Kaikai
Affiliation1.China Univ Geosci Beijing, Sch Energy Resource, Beijing 100083, Peoples R China
2.Minist Educ, Key Lab Marine Reservoir Evolut & Hydrocarbon Enr, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources, 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
Recommended Citation
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.
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