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Multiphase dolomitization of a microbialite-dominated gas reservoir, the middle Triassic Leikoupo Formation, Sichuan Basin, China
Jiang, Lei1,2,3; Xu, Zhaohui4; Shi, Shuyuan4; Liu, Wei4
2019-09-01
Source PublicationJOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN0920-4105
Volume180Pages:820-834
AbstractMicrobialites have great economic potentials in hosting hydrocarbons throughout the geological record. Diagenesis, particularly dolomitization, has been proven to be crucial in microbialite reservoir development, however, the impacts of dolomitization on microbialite reservoir quality were not yet clearly understood. In this study, core samples covering the Middle Triassic Leikoupo formation were collected, and combination of petrology, fluid-inclusion microthermometry, and stable and radiogenic isotopes analyses was conducted, aiming at unraveling the origin of the dolomites and their reservoir characteristics in the microbialites from the Sichuan Basin, China. Two types of microbial dolostone reservoir were determined and compared in terms of their dolomitization mechanisms and reservoir characteristics. Organogenic dolomitization mediated by microbial activities probably resulted in the initial biotic dolomicirte (D1) precipitation in sediment pile as a consequence of bacterial sulfate reduction (BSR), characterized by significant delta C-13 depletion compare to the middle Triassic seawater value. An early stage dolomitization, occurred in fluids dominated by seawater was responsible for the precipitation of very fine crystalline dolomite (D2). Burial dolomitization, precipitated medium-to coarsely crystalline dolomite cements (D3) from burial brine in temperatures between 120 degrees C and 160 degrees C and characterized by elevated Sr-87/Sr-86 values and slightly low delta C-13 values. Last hydrothermal dolomitization event, represented by saddle dolomite cement (D4), has probably occurred and is associated with deeply-seated hydrothermal fluids at temperatures > 200 degrees C. Abiotic microbialite dolomudstone reservoir quality (D2) (porosity = 7.4%; permeability = 24.9 mD) superior to the biotic microbial-mediated dolomudstone reservoir (D1) (porosity=1.4%; permeability=0.6 mD). Microbialite dolomudstone reservoirs (D2) are microporous, with the presence of both primary porosity, e.g., framework and interparticle, and secondary porosity, e.g., solution-enlarged and micropores. The wide occurrence of intragranular and micro-fracture, together with the proximity of larger macropores, may increase connectivity and allow for a combined micropore to macropore transport process for natural gases. Micropores in these dolostones were interpreted to be formed by mole to mole replacement of calcite by dolomite. Hence, this study emphasizes the important role of dolomitization in the formation of ancient microporous microbialites reservoirs characterized by low porosity and low permeability.
KeywordMicrobialite reservoirs Dolomitization Meteoric water diagenesis Sulfate reduction Hydrothermal fluids
DOI10.1016/j.petrol.2019.05.014
Funding OrganizationChina National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
WOS KeywordDOLOMITE RESERVOIRS ; FEIXIANGUAN FORMATION ; CARBONATE RESERVOIRS ; CREEK FIELD ; TARIM BASIN ; POROSITY ; EVOLUTION ; PRECIPITATION ; DELTA-C-13 ; FACIES
Language英语
Funding ProjectChina National Science and Technology Major Project[2016ZX05004] ; PetroChina Projects[2016B-0401] ; PetroChina Projects[2018A-0104] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2018088] ; Chinese Scholarship Council (CSC)[201704910007] ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China[UTA14-001294/15HT10500000010]
Funding OrganizationChina National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; China National Science and Technology Major Project ; China National Science and Technology Major Project ; PetroChina Projects ; PetroChina Projects ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Chinese Scholarship Council (CSC) ; Chinese Scholarship Council (CSC) ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China ; project Evaporite-Associated Carbonate Reservoirs in Sichuan Basin: Lower Cambrian Longwangmiao Formation and Middle Triassic Leikoupo Formation - Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Petroleum
WOS IDWOS:000474691800072
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92936
Collection油气资源研究院重点实验室
Corresponding AuthorJiang, Lei
Affiliation1.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Explorat, Chengdu 610059, Sichuan, Peoples R China
4.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Jiang, Lei,Xu, Zhaohui,Shi, Shuyuan,et al. Multiphase dolomitization of a microbialite-dominated gas reservoir, the middle Triassic Leikoupo Formation, Sichuan Basin, China[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2019,180:820-834.
APA Jiang, Lei,Xu, Zhaohui,Shi, Shuyuan,&Liu, Wei.(2019).Multiphase dolomitization of a microbialite-dominated gas reservoir, the middle Triassic Leikoupo Formation, Sichuan Basin, China.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,180,820-834.
MLA Jiang, Lei,et al."Multiphase dolomitization of a microbialite-dominated gas reservoir, the middle Triassic Leikoupo Formation, Sichuan Basin, China".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 180(2019):820-834.
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