Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

Based on core observations, thin sections, X-ray diffraction (XRD), and seismic data, the lithofacies types in the organic-rich Longmaxi shale (Lower Silurian) in the Changning area of the southern Sichuan Basin were identified. The factors controlling the spatial variations in the shale lithofacies...

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Autores principales:	Qingsong Tang, Lu Zhou, Lei Chen, Xiucheng Tan, Gaoxiang Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	shale lithofacies Longmaxi Formation Silurian south Sichuan Basin Science Q
Acceso en línea:	https://doaj.org/article/63c85ce29e0040ce99c13b6b4da03834
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spelling	oai:doaj.org-article:63c85ce29e0040ce99c13b6b4da038342021-12-01T14:18:58ZDevelopment Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China2296-646310.3389/feart.2021.775657https://doaj.org/article/63c85ce29e0040ce99c13b6b4da038342021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.775657/fullhttps://doaj.org/toc/2296-6463Based on core observations, thin sections, X-ray diffraction (XRD), and seismic data, the lithofacies types in the organic-rich Longmaxi shale (Lower Silurian) in the Changning area of the southern Sichuan Basin were identified. The factors controlling the spatial variations in the shale lithofacies and the influences of the shale lithofacies on shale gas development were also analyzed. Results indicate that there are seven main types of shale lithofacies in the Long11 sub-member of the Longmaxi Formation, including siliceous shale (S-1), mixed siliceous shale (S-2), carbonate-rich siliceous shale (S-3), clay-rich siliceous shale (S-4), carbonate/siliceous shale (M-1), mixed shale (M-2), and argillaceous/siliceous shale (M-4). A vertical transition from the carbonate shale association + mixed shale association at the bottom of the sub-member to a siliceous shale association and mixed shale association + siliceous shale at the top generally appears in the Long11 sub-member. The shale lithofacies of the Long11 sub-member also laterally change from the central depression (low-lying area) to the geomorphic highland in the east and west parts of the Changning area. The spatial variations in shale lithofacies in the Long11 sub-member of the Changning area were mainly controlled by palaeogeomorphology and relative sea level. The geomorphic highland area is dominated by carbonate-rich siliceous shale and mixed siliceous shale, but the depression (low-lying area) is mainly dominated by mixed siliceous shale and argillaceous/carbonate shale.Qingsong TangQingsong TangLu ZhouLei ChenLei ChenLei ChenXiucheng TanXiucheng TanXiucheng TanGaoxiang WangGaoxiang WangFrontiers Media S.A.articleshalelithofaciesLongmaxi FormationSiluriansouth Sichuan BasinScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	shale lithofacies Longmaxi Formation Silurian south Sichuan Basin Science Q
spellingShingle	shale lithofacies Longmaxi Formation Silurian south Sichuan Basin Science Q Qingsong Tang Qingsong Tang Lu Zhou Lei Chen Lei Chen Lei Chen Xiucheng Tan Xiucheng Tan Xiucheng Tan Gaoxiang Wang Gaoxiang Wang Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
description	Based on core observations, thin sections, X-ray diffraction (XRD), and seismic data, the lithofacies types in the organic-rich Longmaxi shale (Lower Silurian) in the Changning area of the southern Sichuan Basin were identified. The factors controlling the spatial variations in the shale lithofacies and the influences of the shale lithofacies on shale gas development were also analyzed. Results indicate that there are seven main types of shale lithofacies in the Long11 sub-member of the Longmaxi Formation, including siliceous shale (S-1), mixed siliceous shale (S-2), carbonate-rich siliceous shale (S-3), clay-rich siliceous shale (S-4), carbonate/siliceous shale (M-1), mixed shale (M-2), and argillaceous/siliceous shale (M-4). A vertical transition from the carbonate shale association + mixed shale association at the bottom of the sub-member to a siliceous shale association and mixed shale association + siliceous shale at the top generally appears in the Long11 sub-member. The shale lithofacies of the Long11 sub-member also laterally change from the central depression (low-lying area) to the geomorphic highland in the east and west parts of the Changning area. The spatial variations in shale lithofacies in the Long11 sub-member of the Changning area were mainly controlled by palaeogeomorphology and relative sea level. The geomorphic highland area is dominated by carbonate-rich siliceous shale and mixed siliceous shale, but the depression (low-lying area) is mainly dominated by mixed siliceous shale and argillaceous/carbonate shale.
format	article
author	Qingsong Tang Qingsong Tang Lu Zhou Lei Chen Lei Chen Lei Chen Xiucheng Tan Xiucheng Tan Xiucheng Tan Gaoxiang Wang Gaoxiang Wang
author_facet	Qingsong Tang Qingsong Tang Lu Zhou Lei Chen Lei Chen Lei Chen Xiucheng Tan Xiucheng Tan Xiucheng Tan Gaoxiang Wang Gaoxiang Wang
author_sort	Qingsong Tang
title	Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
title_short	Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
title_full	Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
title_fullStr	Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
title_full_unstemmed	Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China
title_sort	development characteristics of shale lithofacies in the longmaxi formation and their main controlling factors in the changning area, south sichuan basin, sw china
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/63c85ce29e0040ce99c13b6b4da03834
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Development Characteristics of Shale Lithofacies in the Longmaxi Formation and their Main Controlling Factors in the Changning Area, South Sichuan Basin, SW China

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