Silurian tectonic-sedimentary setting and basin evolution in the Sichuan area, southwest China: Implications for palaeogeographic reconstructions

被引:78
|
作者
Huang, Hanyu [1 ]
He, Dengfa [1 ]
Li, Yingqiang [1 ]
Li, Jiao [1 ]
Zhang, Li [1 ]
机构
[1] China Univ Geosci, Key Lab Marine Reservoir Evolut & Hydrocarbon Acc, Minist Educ, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Depositional environment; Black shale; Palaeogeography; Tectonic evolution; Silurian; Sichuan Basin; CARBON-ISOTOPE STRATIGRAPHY; DEGLACIAL BLACK SHALE; LATE ORDOVICIAN; DEPOSITIONAL ENVIRONMENT; HIRNANTIAN GLACIATION; SEQUENCE STRATIGRAPHY; GLOBAL CORRELATION; LATEST ORDOVICIAN; YANGTZE SEA; HOT SHALE;
D O I
10.1016/j.marpetgeo.2017.11.006
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Silurian black shales are among the most significant hydrocarbon source rocks globally, and are widespread across the southern and eastern Sichuan Basin and adjacent areas. Their tremendous production potential has been demonstrated by the discovery of self-sourced shale gas reservoirs in the Jiaoshiba field, in the Fuling area of the Sichuan Basin. In this study, we reconstruct the tectonic and palaeogeographic framework of the Silurian Sichuan Basin, analyze the distribution of sedimentary facies, and subdivide the sedimentary succession into a number of stages. Understanding the formation and evolution of the Silurian Basin is necessary to predict its potential for future hydrocarbon exploration and development; and may also help to better understand global palaeoceanographic conditions during this interval. The Sichuan Basin in the Silurian period was located along the northwestern margin of the Yangtze Plate, which was itself located on the northern margin of Gondwana at a low (near equatorial) latitude. The basin was initially composed of an intracratonic depression surrounded by three structural uplifts, forming a semi-enclosed shallow sea, however the basin experienced intraplate tectonic deformation at an early stage, followed by continued flexural subsidence and intracratonic deformation. Preserved Silurian strata, comprising the Longmaxi, Shiniulan, and Hanjiadian formations, reflect several depositional stages, including: (1) slow deposition of the basal black shale of the Longmaxi Formation in a deep water environment, due to a transgressive lag following glacial melting in Gondwana, the resulting sea level rise, and intraplate tectonic activity; (2) rapid sedimentation during the later stage of Longmaxi deposition; (3) deposition of the Shiniulan Formation on a neritic carbonate platform in the southern of the basin; (4) deposition of the siliciclastic Hanjiadian Formation in a deltaic environment.
引用
收藏
页码:403 / 423
页数:21
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