Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

Abstract The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin, northwestern China. The Xiagou Formation source rock was formed in a closed, anoxic, reducing, alkaline lacustrine environment wit...

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Autores principales:	Gang Gao, Wei-Wei Zhang, Guo-Fu Ma, Guo Chen, Tao Li, Ling-Zhi Hu, Zhi-Ming Yang, Jian-Guo Wang, Jun Yang
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Mineral composition Geochemistry Source rock Xiagou Formation Qingxi Sag Jiuquan Basin Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/d557952ceceb419ab40ea7e2ba199d42
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spelling	oai:doaj.org-article:d557952ceceb419ab40ea7e2ba199d422021-12-02T00:29:47ZMineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China10.1007/s12182-017-0213-y1672-51071995-8226https://doaj.org/article/d557952ceceb419ab40ea7e2ba199d422018-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-017-0213-yhttps://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin, northwestern China. The Xiagou Formation source rock was formed in a closed, anoxic, reducing, alkaline lacustrine environment with a high salinity. Its high content of brittle minerals is favorable for the fracturing of reservoirs in source rock formations in the Qingxi Sag. The Xiagou Formation contains a great number of fair to excellent source rocks, and their organic matter (OM) came chiefly from plankton/algae and high plants as well as possibly bacterial organisms. The Xiagou Formation source rocks mainly contain Type II OM and some Type III and Type I OM, with good oil-generating potential. The source rock maturity is mainly in the early-mature and mature stages, and its Ro value corresponding to oil peak is about 0.8%, which is lower than classic oil peak Ro value of 1.0%; therefore, a great deal of hydrocarbon was generated before the classic oil peak Ro = 1.0%. Mature source rock in the Xiagou Formation tends to be distributed in the older members and at a greater depth. There is a better exploration potential of tight oil in the deep Qingxi Sag.Gang GaoWei-Wei ZhangGuo-Fu MaGuo ChenTao LiLing-Zhi HuZhi-Ming YangJian-Guo WangJun YangKeAi Communications Co., Ltd.articleMineral compositionGeochemistrySource rockXiagou FormationQingxi SagJiuquan BasinScienceQPetrologyQE420-499ENPetroleum Science, Vol 15, Iss 1, Pp 51-67 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mineral composition Geochemistry Source rock Xiagou Formation Qingxi Sag Jiuquan Basin Science Q Petrology QE420-499
spellingShingle	Mineral composition Geochemistry Source rock Xiagou Formation Qingxi Sag Jiuquan Basin Science Q Petrology QE420-499 Gang Gao Wei-Wei Zhang Guo-Fu Ma Guo Chen Tao Li Ling-Zhi Hu Zhi-Ming Yang Jian-Guo Wang Jun Yang Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
description	Abstract The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin, northwestern China. The Xiagou Formation source rock was formed in a closed, anoxic, reducing, alkaline lacustrine environment with a high salinity. Its high content of brittle minerals is favorable for the fracturing of reservoirs in source rock formations in the Qingxi Sag. The Xiagou Formation contains a great number of fair to excellent source rocks, and their organic matter (OM) came chiefly from plankton/algae and high plants as well as possibly bacterial organisms. The Xiagou Formation source rocks mainly contain Type II OM and some Type III and Type I OM, with good oil-generating potential. The source rock maturity is mainly in the early-mature and mature stages, and its Ro value corresponding to oil peak is about 0.8%, which is lower than classic oil peak Ro value of 1.0%; therefore, a great deal of hydrocarbon was generated before the classic oil peak Ro = 1.0%. Mature source rock in the Xiagou Formation tends to be distributed in the older members and at a greater depth. There is a better exploration potential of tight oil in the deep Qingxi Sag.
format	article
author	Gang Gao Wei-Wei Zhang Guo-Fu Ma Guo Chen Tao Li Ling-Zhi Hu Zhi-Ming Yang Jian-Guo Wang Jun Yang
author_facet	Gang Gao Wei-Wei Zhang Guo-Fu Ma Guo Chen Tao Li Ling-Zhi Hu Zhi-Ming Yang Jian-Guo Wang Jun Yang
author_sort	Gang Gao
title	Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
title_short	Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
title_full	Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
title_fullStr	Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
title_full_unstemmed	Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China
title_sort	mineral composition and organic geochemistry of the lower cretaceous xiagou formation source rock from the qingxi sag, jiuquan basin, northwest china
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/d557952ceceb419ab40ea7e2ba199d42
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Mineral composition and organic geochemistry of the Lower Cretaceous Xiagou Formation source rock from the Qingxi Sag, Jiuquan Basin, Northwest China

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