Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China)
文献类型：期刊论文
| 作者 | Hu, Yongjie3,4,5,7; Cai, Chunfang3,5,6,7; Pederson, Chelsea L.4; Liu, Dawei3,5,7; Jiang, Lei3; He, Xunyun1; Shi, Shuyuan2; Imrnenhauser, Adrian4 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2020-03-01 |
| 卷号 | 338页码:21 |
| 关键词 | Ediacaran Dolomitization Thermochemical sulfate reduction Deep burial dissolution Porosity |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2020.105595 |
| 英文摘要 | The 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. |
| WOS关键词 | THERMOCHEMICAL SULFATE REDUCTION ; HYDROTHERMAL DOLOMITE RESERVOIR ; TRIASSIC FEIXIANGUAN FORMATION ; SINIAN DENGYING FORMATION ; NORTHERN TARIM BASIN ; CARBONATE RESERVOIRS ; ORDOVICIAN CARBONATES ; PRECAMBRIAN BASEMENT ; DIAGENESIS ; PLATFORM |
| 资助项目 | Special Major Project on Petroleum Study[2017ZX05008003-040] ; Natural Science Foundation of China[41672143] ; Natural Science Foundation of China[41730424] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000515431900021 |
| 出版者 | ELSEVIER |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95622]  |
| 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 | Cai, Chunfang |
| 作者单位 | 1.PetroChina, Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China 2.PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 4.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Univ Str 150, D-44801 Bochum, Germany 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 6.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan 430100, Peoples R China 7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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