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  4. 中国科学院新生代地质与环境重点实验室
Evolution of diagenetic fluids in the deeply buried, upper Ediacaran Dengying Formation, Central Sichuan Basin, China

文献类型：期刊论文

作者Hu, Y. J.1; Cai, C. F.2; Li, Y.3; Zhou, R.1; Tang, Y. J.4,5; Hu, J. F.1; Lu, F. C.1; Sun, P.4,5
刊名AUSTRALIAN JOURNAL OF EARTH SCIENCES
出版日期2022-10-26
页码17
ISSN号0812-0099
关键词Ediacaran deep-burial dolostone reservoir diagenetic fluids rare earth elements
DOI10.1080/08120099.2023.2126524
英文摘要Deeply buried Precambrian carbonate reservoirs host economic petroleum reserves. The upper Ediacaran Dengying Formation (maximum burial depth >8 km) is predominantly composed of dolostone with porosity ranging from 2 to 4%, and minor limestone with a porosity of <2%. Detailed petrological observations and high-resolution geochemical analyses show the evolution from depositional fluids to late diagenetic fluids. Dolostone is subdivided into dolo-mudstone, dolo-laminite, stromatolitic dolostone, thrombolitic dolostone and oncoidal dolostone. These dolostones were precipitated from the Ediacaran seawater and yield rare earth elements and yttrium (REY) patterns similar to those of modern seawater. In the early diagenetic regimes, fibrous dolomite cement, characterised by superchondritic Y/Ho ratios, was first precipitated from marine porewaters, and then fine-crystalline dolomite cement, characterised by low Y/Ho ratios, was formed during meteoric diagenesis. Bladed dolomite cement was subsequently precipitated from (modified) seawater-dominated porewaters. In the intermediate burial regimes, medium- to coarse-crystalline dolomite cement was formed during reduction of Mn oxides. In the deep-burial regimes, saddle dolomite was precipitated from hydrothermal fluids and yields REY patterns characterised by MREE enrichment. Its superchondritic Y/Ho ratios were likely caused by the fractionation between Y and Ho during the co-precipitation of fluorite. Calcite cement has similar parent fluids to those of saddle dolomite. These dolomite phases have similar delta C-13 values, while their delta O-18 values gradually decrease during the paragenetic sequence. Multiphase dolomitisation led to the increase in Ca/Mg ratios of formation water and reservoir performance. This study is significant for those concerned with the deeply buried dolostone reservoirs.
WOS关键词RARE-EARTH-ELEMENTS ; CAMBRIAN ARA GROUP ; ISOTOPE FRACTIONATION ; CARBONATE RESERVOIRS ; SOUTH CHINA ; GEOCHEMISTRY ; YTTRIUM ; CALCITE ; SYSTEM ; DOLOMITIZATION
资助项目National Natural Science Foundation of China[41730424] ; National Natural Science Foundation of China[41961144023]
WOS研究方向Geology
语种英语
出版者TAYLOR & FRANCIS LTD
WOS记录号WOS:000875215100001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107729]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Hu, Y. J.; Li, Y.
作者单位1.Sinopec Int Petr Explorat & Prod Corp, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
3.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
4.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan 430100, Peoples R China
5.Yangtze Univ, Coll Resource & Environm, Wuhan 430100, Peoples R China
推荐引用方式
GB/T 7714		 Hu, Y. J.,Cai, C. F.,Li, Y.,et al. Evolution of diagenetic fluids in the deeply buried, upper Ediacaran Dengying Formation, Central Sichuan Basin, China[J]. AUSTRALIAN JOURNAL OF EARTH SCIENCES,2022:17.
APA Hu, Y. J..,Cai, C. F..,Li, Y..,Zhou, R..,Tang, Y. J..,...&Sun, P..(2022).Evolution of diagenetic fluids in the deeply buried, upper Ediacaran Dengying Formation, Central Sichuan Basin, China.AUSTRALIAN JOURNAL OF EARTH SCIENCES,17.
MLA Hu, Y. J.,et al."Evolution of diagenetic fluids in the deeply buried, upper Ediacaran Dengying Formation, Central Sichuan Basin, China".AUSTRALIAN JOURNAL OF EARTH SCIENCES (2022):17.

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来源：地质与地球物理研究所

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