Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China

Shale oil and source rock samples of the Carboniferous Keluke Formation from well Chaiye 2 in the Delingha Depression were analyzed by gas chromatography–mass spectrometry. Source rocks were highly mature at the gas generation stage with vitrinite reflectance (Ro) of 1.45–1.88%. However, the oil pro...

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Autores principales:	Qianru Wang, Haiping Huang, Chuan He, Zongxing Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thermal maturity differential evolution biomarkers diamondoid hydrocarbons clay catalysis Qaidam Basin Technology T
Acceso en línea:	https://doaj.org/article/3277084736b449628ba54923f94d9458
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spelling	oai:doaj.org-article:3277084736b449628ba54923f94d94582021-11-11T15:53:30ZDifferential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China10.3390/en142170881996-1073https://doaj.org/article/3277084736b449628ba54923f94d94582021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7088https://doaj.org/toc/1996-1073Shale oil and source rock samples of the Carboniferous Keluke Formation from well Chaiye 2 in the Delingha Depression were analyzed by gas chromatography–mass spectrometry. Source rocks were highly mature at the gas generation stage with vitrinite reflectance (Ro) of 1.45–1.88%. However, the oil produced from the shale reservoir was characterized by abundant biomarkers but low abundance of diamondoid hydrocarbons with estimated Ro of ca. 0.78%, indicating hydrocarbons were still at a relatively low thermal maturity level. As the crude oil was generated and accumulated autochthonously, preliminary results indicate that crude oil and source rocks witnessed differential thermal evolution and significant disparity of the current thermal maturity in the shale reservoir due to rapid tectonic subsidence and clay mineral catalysts that accelerated the thermal maturation process. Although tectonic uplifts occurred afterwards, the vitrinite recorded the highest maturity that source rocks have ever reached, whereas the oil has not reached the same maturity level due to less impact from thermal alteration or mineral catalysis than source rocks in the shale reservoir. Such a discovery enlarges the hydrocarbon perseveration of maturity ranges in reservoirs, particularly for the unconventional tight formation, and benefits potential hydrocarbon exploration from highly mature sediments.Qianru WangHaiping HuangChuan HeZongxing LiMDPI AGarticlethermal maturitydifferential evolutionbiomarkersdiamondoid hydrocarbonsclay catalysisQaidam BasinTechnologyTENEnergies, Vol 14, Iss 7088, p 7088 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermal maturity differential evolution biomarkers diamondoid hydrocarbons clay catalysis Qaidam Basin Technology T
spellingShingle	thermal maturity differential evolution biomarkers diamondoid hydrocarbons clay catalysis Qaidam Basin Technology T Qianru Wang Haiping Huang Chuan He Zongxing Li Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
description	Shale oil and source rock samples of the Carboniferous Keluke Formation from well Chaiye 2 in the Delingha Depression were analyzed by gas chromatography–mass spectrometry. Source rocks were highly mature at the gas generation stage with vitrinite reflectance (Ro) of 1.45–1.88%. However, the oil produced from the shale reservoir was characterized by abundant biomarkers but low abundance of diamondoid hydrocarbons with estimated Ro of ca. 0.78%, indicating hydrocarbons were still at a relatively low thermal maturity level. As the crude oil was generated and accumulated autochthonously, preliminary results indicate that crude oil and source rocks witnessed differential thermal evolution and significant disparity of the current thermal maturity in the shale reservoir due to rapid tectonic subsidence and clay mineral catalysts that accelerated the thermal maturation process. Although tectonic uplifts occurred afterwards, the vitrinite recorded the highest maturity that source rocks have ever reached, whereas the oil has not reached the same maturity level due to less impact from thermal alteration or mineral catalysis than source rocks in the shale reservoir. Such a discovery enlarges the hydrocarbon perseveration of maturity ranges in reservoirs, particularly for the unconventional tight formation, and benefits potential hydrocarbon exploration from highly mature sediments.
format	article
author	Qianru Wang Haiping Huang Chuan He Zongxing Li
author_facet	Qianru Wang Haiping Huang Chuan He Zongxing Li
author_sort	Qianru Wang
title	Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
title_short	Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
title_full	Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
title_fullStr	Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
title_full_unstemmed	Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China
title_sort	differential thermal evolution between oil and source rocks in the carboniferous shale reservoir of the qaidam basin, nw china
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3277084736b449628ba54923f94d9458
work_keys_str_mv	AT qianruwang differentialthermalevolutionbetweenoilandsourcerocksinthecarboniferousshalereservoiroftheqaidambasinnwchina AT haipinghuang differentialthermalevolutionbetweenoilandsourcerocksinthecarboniferousshalereservoiroftheqaidambasinnwchina AT chuanhe differentialthermalevolutionbetweenoilandsourcerocksinthecarboniferousshalereservoiroftheqaidambasinnwchina AT zongxingli differentialthermalevolutionbetweenoilandsourcerocksinthecarboniferousshalereservoiroftheqaidambasinnwchina
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Differential Thermal Evolution between Oil and Source Rocks in the Carboniferous Shale Reservoir of the Qaidam Basin, NW China

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