Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)

Abstract The oils in the Rewapu Block of the Halahatang Oilfield in the Tarim Basin (northwestern China) were geochemically analyzed by gas chromatography–mass spectrometry to investigate their origin and possible secondary alteration. The physical properties and chemical compositions of these Ordov...

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Autores principales:	You-Jun Tang, Mei-Jun Li, Rong-Hui Fang, Bao-Shou Zhang, Zhe Yang, Da-Xiang He, Meng-Ru Li
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2018
Materias:	Biodegradation Water washing Oil charging process Ordovician Tarim Basin Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/5ee6d54d7e13457b93eb8ec2102a20a8
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spelling	oai:doaj.org-article:5ee6d54d7e13457b93eb8ec2102a20a82021-12-02T08:18:14ZGeochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)10.1007/s12182-018-0284-41672-51071995-8226https://doaj.org/article/5ee6d54d7e13457b93eb8ec2102a20a82018-12-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0284-4https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract The oils in the Rewapu Block of the Halahatang Oilfield in the Tarim Basin (northwestern China) were geochemically analyzed by gas chromatography–mass spectrometry to investigate their origin and possible secondary alteration. The physical properties and chemical compositions of these Ordovician oils vary greatly, ranging from light to extremely heavy oils. All these oils belong to one single population and were derived from same source kitchen/bed. The differences in their chemical compositions and physical properties mainly result from secondary alteration of oils that were charged during the early phase of trap formation. The thickness of Upper Ordovician and Silurian caprocks of oil reservoirs in the Rewapu Block is higher than that in the north part of the Halahatang region, and therefore, significant biodegradation process is prevented. Compared to heavy oils in the north part, the Rewapu oils are dominated by light oils with no 25-norhopanes and no GC–MS “hump” (UCM: unresolved complex mixture) on the chromatographic baselines. The heavy oils in Wells RP7 and RP101C were primarily influenced by water washing since apparent reduction of alkylated dibenzothiophenes was observed. The local geological background favored the water washing alteration. The reservoir geochemical study has practical application in hydrocarbon exploration and predicts the nature of oils in this oilfield.You-Jun TangMei-Jun LiRong-Hui FangBao-Shou ZhangZhe YangDa-Xiang HeMeng-Ru LiKeAi Communications Co., Ltd.articleBiodegradationWater washingOil charging processOrdovicianTarim BasinScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 1, Pp 1-13 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biodegradation Water washing Oil charging process Ordovician Tarim Basin Science Q Petrology QE420-499
spellingShingle	Biodegradation Water washing Oil charging process Ordovician Tarim Basin Science Q Petrology QE420-499 You-Jun Tang Mei-Jun Li Rong-Hui Fang Bao-Shou Zhang Zhe Yang Da-Xiang He Meng-Ru Li Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
description	Abstract The oils in the Rewapu Block of the Halahatang Oilfield in the Tarim Basin (northwestern China) were geochemically analyzed by gas chromatography–mass spectrometry to investigate their origin and possible secondary alteration. The physical properties and chemical compositions of these Ordovician oils vary greatly, ranging from light to extremely heavy oils. All these oils belong to one single population and were derived from same source kitchen/bed. The differences in their chemical compositions and physical properties mainly result from secondary alteration of oils that were charged during the early phase of trap formation. The thickness of Upper Ordovician and Silurian caprocks of oil reservoirs in the Rewapu Block is higher than that in the north part of the Halahatang region, and therefore, significant biodegradation process is prevented. Compared to heavy oils in the north part, the Rewapu oils are dominated by light oils with no 25-norhopanes and no GC–MS “hump” (UCM: unresolved complex mixture) on the chromatographic baselines. The heavy oils in Wells RP7 and RP101C were primarily influenced by water washing since apparent reduction of alkylated dibenzothiophenes was observed. The local geological background favored the water washing alteration. The reservoir geochemical study has practical application in hydrocarbon exploration and predicts the nature of oils in this oilfield.
format	article
author	You-Jun Tang Mei-Jun Li Rong-Hui Fang Bao-Shou Zhang Zhe Yang Da-Xiang He Meng-Ru Li
author_facet	You-Jun Tang Mei-Jun Li Rong-Hui Fang Bao-Shou Zhang Zhe Yang Da-Xiang He Meng-Ru Li
author_sort	You-Jun Tang
title	Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
title_short	Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
title_full	Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
title_fullStr	Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
title_full_unstemmed	Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)
title_sort	geochemistry and origin of ordovician oils in the rewapu block of the halahatang oilfield (nw china)
publisher	KeAi Communications Co., Ltd.
publishDate	2018
url	https://doaj.org/article/5ee6d54d7e13457b93eb8ec2102a20a8
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Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield (NW China)

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