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DOI	10.1016/j.marpetgeo.2021.105251
	Diagenesis and pore evolution for various lithofacies of the Wufeng-Longmaxi shale, southern Sichuan Basin, China
	Wang, Yang; Cheng, Hongfei; Hu, Qinhong; Liu, Luofu; Hao, Lewei
通讯作者	Cheng, HF (通讯作者)，Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China. ; Hu, QH (通讯作者)，Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX 76019 USA.
发表日期	2021
ISSN	0264-8172
EISSN	1873-4073
卷号	133
英文摘要	Mineralogy differences in clastic sediments have a major impact on the diagenetic pathway and the evolution of pore systems between various lithofacies during burial. There is, however, a lack of studies on shale diagenesis since fine-grained particles are difficult to image and observe directly. Here, a quantitative method by pore counting was performed on the Wufeng-Longmaxi shale from Sichuan Basin, China with siliceous, argillaceous, and calcareous lithofacies, which makes it ideal for studying the impact of diagenesis on pore systems in different lithofacies experiencing the same burial history. The siliceous shale was formed under the anoxic reducing conditions, while argillaceous and calcareous shales were formed under dysoxic-to-oxic conditions. Authigenic quartz, of mostly biogenic origin, accounts for about 60% and 12% of the total quartz content in siliceous and calcareous shales, respectively, whereas it in argillaceous shale is almost detrital origin. The typical diagenetic sequence has the following order: compaction, cementation, clay transformation, dissolution, and organic matter (OM) maturation and its accompanying migrated OM filling. The quantitative calculation reveals that the initial porosity rapidly declines owing to compaction and cementation, while dissolution and OM maturation increase porosity to some extent. Specifically, the dominant factor resulting in porosity reduction varies in different lithofacies, which is quartz cementation and compaction for siliceous and argillaceous shales, respectively, and is both cementation (mainly quartz and carbonates) and compaction for calcareous shales. Additionally, the matrix composition controls the dominant diagenetic events in different lithofacies during the eogenetic (early diagenetic) stage, as indicated by the cementation of authigenic quartz for siliceous and compaction of ductile clays for argillaceous shales. Overall, diagenesis determines the final status of the initial pore space during the mesogenetic (middle diagenetic) stage, which further controls the abundance and distribution of migrated OM, and thus the development of the dominant OM pores in the entire pore spectrum.
关键词	TRIASSIC YANCHANG FORMATION THERMAL MATURITY ORDOS BASIN RESERVOIR QUALITY SILICEOUS MUDSTONES SPACE MORPHOLOGY BARNETT SHALE GAS SYSTEMS BIB-SEM POROSITY
英文关键词	Diagenesis; Porosity evolution; Lithofacies; Quartz origin; Deposition
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000701262700001
来源期刊	MARINE AND PETROLEUM GEOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254902
作者单位	[Wang, Yang; Cheng, Hongfei] Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China; [Wang, Yang; Hu, Qinhong] Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX 76019 USA; [Wang, Yang; Liu, Luofu] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China; [Wang, Yang; Liu, Luofu] China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China; [Hao, Lewei] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Hao, Lewei] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yang,Cheng, Hongfei,Hu, Qinhong,et al. Diagenesis and pore evolution for various lithofacies of the Wufeng-Longmaxi shale, southern Sichuan Basin, China[J]. 中国科学院西北生态环境资源研究院,2021,133.
APA	Wang, Yang,Cheng, Hongfei,Hu, Qinhong,Liu, Luofu,&Hao, Lewei.(2021).Diagenesis and pore evolution for various lithofacies of the Wufeng-Longmaxi shale, southern Sichuan Basin, China.MARINE AND PETROLEUM GEOLOGY,133.
MLA	Wang, Yang,et al."Diagenesis and pore evolution for various lithofacies of the Wufeng-Longmaxi shale, southern Sichuan Basin, China".MARINE AND PETROLEUM GEOLOGY 133(2021).