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Diagenesis and Reservoir Evolution Model of the Ediacaran Dengying Formation in the Sichuan Basin: Evidence from Laser Ablation U-Pb Dating and In Situ Isotope Analysis

文献类型：期刊论文

作者Qiao, Zhanfeng1,2; Dong, Jianhua3,4; Yu, Zhou1,2; Li, Wenzheng1,2; Wang, Xiaofang1,2; Jiang, Lei5,6; Qing, Hairuo7
刊名MINERALS
出版日期2022-11-01
卷号12期号:11页码:22
关键词dengying formation microbial dolomite elemental mapping laser ablation U-Pb dating in situ isotope diagenetic pore evolution Sichuan Basin
DOI10.3390/min12111372
英文摘要The microbial dolomite of the Ediacaran Dengying Fm., Sichuan Basin, SW China is endowed with abundant oil and gas resources. A complex diagenetic history greatly complicates the development of such microbial dolomite reservoirs, and has severely restrained hydrocarbon exploration. This study focused on key field profiles in Eastern Sichuan and aimed to decipher the origin and evolution of dolomites, using novel techniques, including elemental mapping, laser ablation U-Pb dating as well as carbon, oxygen, and strontium isotope analyses. Additionally, we compared the diagenesis and reservoir development model for the Dengying microbial dolomites of the Central Sichuan to other areas, with the aim to provide practical guidance for oil and gas exploration across the entire Sichuan Basin. Our results have shown that the Ediacaran microbial dolomite in Eastern Sichuan experienced four stages of diagenetic modification-specifically: (1) syn-sedimentary dolomitization; (2) penecontemporaneous cementation of fibrous dolomite cement; (3) bladed dolomite and brown-dark very fine crystalline dolomite cementation during the Ordovician; and (4) fine crystalline dolomite and medium-coarse crystalline dolomite cementation during the Silurian-Devonian. Petrology and geochemistry data imply that each diagenetic phase of dolomitization was mainly sourced from marine-dominated fluids. The influence of tectonically related fluids was rarely noted. Significantly, U-Pb ages of these dolomites reveal that the history of dolomite infill to pores within the Eastern Sichuan Basin clearly post-dated that in the Central Sichuan region, resulting in high porosities (6%-11%) that favored hydrocarbon accumulation. This study suggests that the platform margin at the eastern edge of the Xuanhan-Kaijiang paleo-uplift is favorable as the next key exploration target for microbial dolomites in the Sichuan Basin.
WOS关键词CARBONATE RESERVOIRS ; DOLOMITE RESERVOIRS ; PRESQUILE BARRIER ; TARIM BASIN ; ARA GROUP ; GENESIS ; DOLOMITIZATION ; SR-87/SR-86 ; SEAWATER ; POROSITY
资助项目PetroChina Scientific Research and Technology Development Projects[2021DJ0503]
WOS研究方向Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者MDPI
WOS记录号WOS:000883154400001
资助机构PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects ; PetroChina Scientific Research and Technology Development Projects
源URL[http://ir.iggcas.ac.cn/handle/132A11/107714]  
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Qiao, Zhanfeng; Dong, Jianhua
作者单位1.PetroChina Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China
2.CNPC Key Lab Carbonate Reservoir, Hangzhou 310023, Peoples R China
3.China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China
4.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
7.Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada
推荐引用方式
GB/T 7714		 Qiao, Zhanfeng,Dong, Jianhua,Yu, Zhou,et al. Diagenesis and Reservoir Evolution Model of the Ediacaran Dengying Formation in the Sichuan Basin: Evidence from Laser Ablation U-Pb Dating and In Situ Isotope Analysis[J]. MINERALS,2022,12(11):22.
APA Qiao, Zhanfeng.,Dong, Jianhua.,Yu, Zhou.,Li, Wenzheng.,Wang, Xiaofang.,...&Qing, Hairuo.(2022).Diagenesis and Reservoir Evolution Model of the Ediacaran Dengying Formation in the Sichuan Basin: Evidence from Laser Ablation U-Pb Dating and In Situ Isotope Analysis.MINERALS,12(11),22.
MLA Qiao, Zhanfeng,et al."Diagenesis and Reservoir Evolution Model of the Ediacaran Dengying Formation in the Sichuan Basin: Evidence from Laser Ablation U-Pb Dating and In Situ Isotope Analysis".MINERALS 12.11(2022):22.

入库方式： OAI收割

来源：地质与地球物理研究所

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