The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin...

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Autores principales:	Sen Li, Ru-Kai Zhu, Jing-Wei Cui, Zhong Luo, Jing-Gang Cui, Han Liu, Wei-Qiang Li
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/98d72f402f534db188de4ee275f05b44
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spelling	oai:doaj.org-article:98d72f402f534db188de4ee275f05b442021-12-02T12:09:37ZThe petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China10.1007/s12182-019-00386-01672-51071995-8226https://doaj.org/article/98d72f402f534db188de4ee275f05b442019-11-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-00386-0https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter.Sen LiRu-Kai ZhuJing-Wei CuiZhong LuoJing-Gang CuiHan LiuWei-Qiang LiKeAi Communications Co., Ltd.articleOrganic-rich shaleVolcanic ashFramboidal pyrite pseudocrystalChang 7 memberOrdos basinScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 6, Pp 1255-1269 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin Science Q Petrology QE420-499
spellingShingle	Organic-rich shale Volcanic ash Framboidal pyrite pseudocrystal Chang 7 member Ordos basin Science Q Petrology QE420-499 Sen Li Ru-Kai Zhu Jing-Wei Cui Zhong Luo Jing-Gang Cui Han Liu Wei-Qiang Li The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
description	Abstract The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin. The sedimentary environment and the controlling factors of organic matter enrichment, however, are still in contention. In this investigation, the Yishicun outcrop, located on the south margin of the Ordos basin, has been considered for the study. X-ray diffraction, polarizing microscopy, field emission scanning electron microscopy and cathodoluminescence (CL) were used to investigate the petrological features of the organic-rich shale. The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level, ash content and the enrichment of organic matter. It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon, demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter. Additionally, with an increase in the ash content, the content of organic matter increased at first and then decreased, and reached a maximum when the ash content was about 6%, illustrating that the ash input has a double effect on the enrichment of organic matter.
format	article
author	Sen Li Ru-Kai Zhu Jing-Wei Cui Zhong Luo Jing-Gang Cui Han Liu Wei-Qiang Li
author_facet	Sen Li Ru-Kai Zhu Jing-Wei Cui Zhong Luo Jing-Gang Cui Han Liu Wei-Qiang Li
author_sort	Sen Li
title	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
title_short	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
title_full	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
title_fullStr	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
title_full_unstemmed	The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China
title_sort	petrological characteristics and significance of organic-rich shale in the chang 7 member of the yanchang formation, south margin of the ordos basin, central china
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/98d72f402f534db188de4ee275f05b44
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The petrological characteristics and significance of organic-rich shale in the Chang 7 member of the Yanchang Formation, south margin of the Ordos basin, central China

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