IGGCAS OpenIR  > 油气资源研究院重点实验室
Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China)
Hu, Yongjie1,3,4,5; Cai, Chunfang1,2,4,5; Pederson, Chelsea L.3; Liu, Dawei1,4,5; Jiang, Lei4; He, Xunyun6; Shi, Shuyuan7; Imrnenhauser, Adrian3
2020-03-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume338Pages:21
AbstractThe deeply buried (> 7 km) upper Ediacaran (Sinian) Dengying Formation (ca. 551.1-541 Ma) in the Sichuan Basin, China, is the largest Precambrian dolostone gas reservoir worldwide. Gas exploration from the Dengying Formation, however, is hampered by a limited understanding of its complex dolomitization history and porosity evolution. New petrological, geochemical and petrophysical analyses were performed and are discussed here to develop a better understanding of the formation's complexities. Microbialite, dolo-grainstone, and crystalline dolostone lithologies from the platform margin have high primary porosities relative to dolo-mudstone and less common microbialite lithologies from the low-energy platform interior. Spatially-variable primary porosity was subsequently overprinted by meteoric dissolution and dolomitization, often inducing secondary porosity. The various forms of dolomitization (sabkha, reflux, and burial dolomitization, and cementation) increased the resistivity of these rocks to chemical and physical compaction and porosity destruction. In the deep burial domain, medium- to coarse-crystalline dolomite cements and saddle dolomite precipitated at fluid temperatures of 120-160 degrees C and 160-220 degrees C, respectively. The significance of deep burial dissolution is critically discussed and constrained by: (i) corrosion of late diagenetic minerals, (ii) pores cross-cutting (or forming around) stylolites, and (iii) the occurrence of solid bitumen in the center of secondary pores. Vuggy, inter- and intracrystalline pores developed during a late and deep burial stage, and comprise ca. 20% of the overall Dengying reservoir porosity. Mechanisms which induced corrosion at this burial stage include hydrothermal pulses and thermochemical sulfate reduction. Similar to many carbonate reservoirs in the Phanerozoic, this study documents that the platform margin has better porosities and higher gas production compared to the platform interior due to its specific carbonate rock properties and diagenesis. Data shown here document the complex multiphase dolomitization history and high potential for gas production from deeply buried Precambrian dolostone reservoirs.
KeywordEdiacaran Dolomitization Thermochemical sulfate reduction Deep burial dissolution Porosity
DOI10.1016/j.precamres.2020.105595
Funding OrganizationSpecial Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
WOS KeywordTHERMOCHEMICAL SULFATE REDUCTION ; HYDROTHERMAL DOLOMITE RESERVOIR ; TRIASSIC FEIXIANGUAN FORMATION ; SINIAN DENGYING FORMATION ; NORTHERN TARIM BASIN ; CARBONATE RESERVOIRS ; ORDOVICIAN CARBONATES ; PRECAMBRIAN BASEMENT ; DIAGENESIS ; PLATFORM
Language英语
Funding ProjectSpecial Major Project on Petroleum Study[2017ZX05008003-040] ; Natural Science Foundation of China[41672143] ; Natural Science Foundation of China[41730424]
Funding OrganizationSpecial Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Special Major Project on Petroleum Study ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000515431900021
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95622
Collection油气资源研究院重点实验室
Corresponding AuthorCai, Chunfang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan 430100, Peoples R China
3.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Univ Str 150, D-44801 Bochum, Germany
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.PetroChina, Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China
7.PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
First Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hu, Yongjie,Cai, Chunfang,Pederson, Chelsea L.,et al. Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China)[J]. PRECAMBRIAN RESEARCH,2020,338:21.
APA Hu, Yongjie.,Cai, Chunfang.,Pederson, Chelsea L..,Liu, Dawei.,Jiang, Lei.,...&Imrnenhauser, Adrian.(2020).Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China).PRECAMBRIAN RESEARCH,338,21.
MLA Hu, Yongjie,et al."Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China)".PRECAMBRIAN RESEARCH 338(2020):21.
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