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  4. 中国科学院新生代地质与环境重点实验室
Multistage dolomitization and formation of ultra-deep Lower Cambrian Longwangmiao Formation reservoir in central Sichuan Basin, China

文献类型：期刊论文

作者Liu, Dawei1,2,3; Cai, Chunfang1,2,3,4; Hu, Yongjie1,2,3; Peng, Yanyan1,2,3; Jiang, Lei1,2,3
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2021
卷号123页码:20
关键词Dolomite reservoirs Longwangmiao formation Dolomitization Lower Cambrian Ultra-deep
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2020.104752
英文摘要The deeply buried dolostones in the Lower Cambrian Longwangmiao Formation at Central Sichuan Basin of China are a crucial hydrocarbon exploration target. However, the origin of various types of dolomite for these carbonate reservoirs has not been well understood. In this study, petrological studies, geochemical analyses including C, O and Sr isotopes, in-situ trace elements and rare earth elements, and fluid inclusions analyses are performed in order to uncover the dolomitization mechanisms. The results show that an initial pervasive replacive dolomitization phase (Md, D1 and D2) was followed by volumetrically less important cement phases (D3, D4, D5, D6 and calcite). The delta O-18 values and element concentrations (e.g., Na and Sr) appear to suggest that this early dolomitization was caused by reflux of slightly modified seawater. In the shallow burial realm, influx of meteoric water led to a decrease in Fe content (from 1000 ppm down to 70 ppm) and Sigma REE content (from 34.22 ppm down to 9.56 ppm) in early diagenetic D3 dolomite with more negative delta O-18(SMOW) values. This early meteoric water flux may have created considerable dissolution porosities. The D3 and D6 dolomite cements were interpreted as the result of dolomite dissolution and reprecipitation due to burial compaction. The D4, D5 dolomites and late calcite cements display markedly positive Eu anomalies suggesting the presence of hydrothermal fluid. Some late diagenetic calcites with negative delta C-13 values as low as 5 parts per thousand V-PDB and relatively higher Y/Ho ratio of ca. 36.9 were interpreted to be derived from thermochemical sulfate reduction (TSR). The effects of hydrothermal fluid and TSR on reservoir qualities seem to be minor in this case. Hence, this study emphasizes the role of late diagenetic preservation of primary and early diagenetic porosity in the formation of economically important, ultra-deep dolostone reservoirs in sedimentary basins.
WOS关键词THERMOCHEMICAL SULFATE REDUCTION ; RARE-EARTH-ELEMENTS ; TRIASSIC FEIXIANGUAN FORMATION ; PENESALINE SEA-WATER ; CARBONATE RESERVOIRS ; GAS-RESERVOIRS ; SUBSURFACE DOLOMITIZATION ; DOLOMITE RESERVOIRS ; LOWER ORDOVICIAN ; IRON-FORMATIONS
资助项目Natural Science Foundation of China[41672143] ; National Science and Technology Major Project[2017ZX05008-003-040]
WOS研究方向Geology
语种英语
WOS记录号WOS:000598618700001
出版者ELSEVIER SCI LTD
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project ; National Science and Technology Major Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/99919]  
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Cai, Chunfang
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Yangtze Univ, Minist Educ, Key Lab Explorat Technol Oil & Gas Resources, Wuhan 430100, Hubei, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Dawei,Cai, Chunfang,Hu, Yongjie,et al. Multistage dolomitization and formation of ultra-deep Lower Cambrian Longwangmiao Formation reservoir in central Sichuan Basin, China[J]. MARINE AND PETROLEUM GEOLOGY,2021,123:20.
APA Liu, Dawei,Cai, Chunfang,Hu, Yongjie,Peng, Yanyan,&Jiang, Lei.(2021).Multistage dolomitization and formation of ultra-deep Lower Cambrian Longwangmiao Formation reservoir in central Sichuan Basin, China.MARINE AND PETROLEUM GEOLOGY,123,20.
MLA Liu, Dawei,et al."Multistage dolomitization and formation of ultra-deep Lower Cambrian Longwangmiao Formation reservoir in central Sichuan Basin, China".MARINE AND PETROLEUM GEOLOGY 123(2021):20.

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