Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China

Abstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, mic...

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Autores principales:	Lei Yang, Bo Ran, Yu-Yue Han, Shu-Gen Liu, Yue-Hao Ye, Christopher Xiao, Wei Sun, Di Yang, Guo-Dong Xia, Shi-Yu Wang
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Guanyinqiao Formation Sichuan Basin Mudstone Laminated mudstone Water condition Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/94dc5f90c0304b5d93466191ecd3e860
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spelling	oai:doaj.org-article:94dc5f90c0304b5d93466191ecd3e8602021-12-02T08:18:14ZSedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China10.1007/s12182-018-0283-51672-51071995-8226https://doaj.org/article/94dc5f90c0304b5d93466191ecd3e8602018-12-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0283-5https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, microscopy and geochemical methods have been used to investigate the petrographic and geochemical characteristics of the formation. Firstly, three mudstone lithofacies were identified based on a wide variety of mudstone laminations. These are: (a) indistinctly laminated mudstone; (b) parallel-laminated mudstone; and (c) nonparallel-laminated mudstone. Then, combining with the evidence from depocenter migration, Th/U ratios and total organic carbon, the abundant organo-minerallic fabrics suggest that organic carbon was preferentially deposited and preserved in anoxic, low energy and stagnant water conditions during deposition of the Wufeng and Longmaxi Formations. On the contrary, the Guanyinqiao Formation with poor organic carbon was deposited in oxic and high-energy water conditions.Lei YangBo RanYu-Yue HanShu-Gen LiuYue-Hao YeChristopher XiaoWei SunDi YangGuo-Dong XiaShi-Yu WangKeAi Communications Co., Ltd.articleGuanyinqiao FormationSichuan BasinMudstoneLaminated mudstoneWater conditionScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 1, Pp 44-57 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Guanyinqiao Formation Sichuan Basin Mudstone Laminated mudstone Water condition Science Q Petrology QE420-499
spellingShingle	Guanyinqiao Formation Sichuan Basin Mudstone Laminated mudstone Water condition Science Q Petrology QE420-499 Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
description	Abstract The Upper Ordovician–Lower Silurian mudstones (including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, microscopy and geochemical methods have been used to investigate the petrographic and geochemical characteristics of the formation. Firstly, three mudstone lithofacies were identified based on a wide variety of mudstone laminations. These are: (a) indistinctly laminated mudstone; (b) parallel-laminated mudstone; and (c) nonparallel-laminated mudstone. Then, combining with the evidence from depocenter migration, Th/U ratios and total organic carbon, the abundant organo-minerallic fabrics suggest that organic carbon was preferentially deposited and preserved in anoxic, low energy and stagnant water conditions during deposition of the Wufeng and Longmaxi Formations. On the contrary, the Guanyinqiao Formation with poor organic carbon was deposited in oxic and high-energy water conditions.
format	article
author	Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang
author_facet	Lei Yang Bo Ran Yu-Yue Han Shu-Gen Liu Yue-Hao Ye Christopher Xiao Wei Sun Di Yang Guo-Dong Xia Shi-Yu Wang
author_sort	Lei Yang
title	Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
title_short	Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
title_full	Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
title_fullStr	Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
title_full_unstemmed	Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China
title_sort	sedimentary environment controls on the accumulation of organic matter in the upper ordovician wufeng–lower silurian longmaxi mudstones in the southeastern sichuan basin of china
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/94dc5f90c0304b5d93466191ecd3e860
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Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China

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