Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone

Abstract Sesquiterpanes are ubiquitous components of crude oils and ancient sediments. Liquid saturated hydrocarbons from simulated pyrolysis experiments on immature organic-rich mudstone collected from the Lower Cretaceous Hesigewula Sag were analyzed by gas chromatography–mass spectrometry (GC–MS...

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Autores principales:	Gang Yan, Yao-Hui Xu, Yan Liu, Peng-Hai Tang, Wei-Bin Liu
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Immature–low-maturity stage Simulated pyrolysis experiment Bicyclic sesquiterpanes Thermal evolution Maturity indicators Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/40292813f5c247a7aaaa9bb64a621017
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spelling	oai:doaj.org-article:40292813f5c247a7aaaa9bb64a6210172021-12-02T11:19:16ZEvolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone10.1007/s12182-019-0326-61672-51071995-8226https://doaj.org/article/40292813f5c247a7aaaa9bb64a6210172019-05-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-0326-6https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Sesquiterpanes are ubiquitous components of crude oils and ancient sediments. Liquid saturated hydrocarbons from simulated pyrolysis experiments on immature organic-rich mudstone collected from the Lower Cretaceous Hesigewula Sag were analyzed by gas chromatography–mass spectrometry (GC–MS). C14 bicyclic sesquiterpanes, namely, 8β(H)-drimane, 8β(H)-homodrimane, and 8α(H)-homodrimane were detected and identified on basis of their diagnostic fragment ions (m/z 123, 179, 193, and 207), and previously published mass spectra data, and these bicyclic sesquiterpanes presented relatively regular characteristics in their thermal evolution. The ratios 8β(H)-drimane/8β(H)-homodrimane, 8β(H)-homodrimane/8α(H)-homodrimane, and 8β(H)-drimane/8α(H)-homodrimane all show a clear upward trend with increasing temperature below the temperature turning point. Thus, all these ratios can be used as evolution indexes of source rocks in the immature–low-maturity stage. However, the last two ratios may be more suitable than the first ratio as valid parameters for measuring the extent of thermal evolution of organic matter in the immature–low-maturity stage because their change amplitude with increasing temperature is more obvious.Gang YanYao-Hui XuYan LiuPeng-Hai TangWei-Bin LiuKeAi Communications Co., Ltd.articleImmature–low-maturity stageSimulated pyrolysis experimentBicyclic sesquiterpanesThermal evolutionMaturity indicatorsScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 3, Pp 502-512 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Immature–low-maturity stage Simulated pyrolysis experiment Bicyclic sesquiterpanes Thermal evolution Maturity indicators Science Q Petrology QE420-499
spellingShingle	Immature–low-maturity stage Simulated pyrolysis experiment Bicyclic sesquiterpanes Thermal evolution Maturity indicators Science Q Petrology QE420-499 Gang Yan Yao-Hui Xu Yan Liu Peng-Hai Tang Wei-Bin Liu Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
description	Abstract Sesquiterpanes are ubiquitous components of crude oils and ancient sediments. Liquid saturated hydrocarbons from simulated pyrolysis experiments on immature organic-rich mudstone collected from the Lower Cretaceous Hesigewula Sag were analyzed by gas chromatography–mass spectrometry (GC–MS). C14 bicyclic sesquiterpanes, namely, 8β(H)-drimane, 8β(H)-homodrimane, and 8α(H)-homodrimane were detected and identified on basis of their diagnostic fragment ions (m/z 123, 179, 193, and 207), and previously published mass spectra data, and these bicyclic sesquiterpanes presented relatively regular characteristics in their thermal evolution. The ratios 8β(H)-drimane/8β(H)-homodrimane, 8β(H)-homodrimane/8α(H)-homodrimane, and 8β(H)-drimane/8α(H)-homodrimane all show a clear upward trend with increasing temperature below the temperature turning point. Thus, all these ratios can be used as evolution indexes of source rocks in the immature–low-maturity stage. However, the last two ratios may be more suitable than the first ratio as valid parameters for measuring the extent of thermal evolution of organic matter in the immature–low-maturity stage because their change amplitude with increasing temperature is more obvious.
format	article
author	Gang Yan Yao-Hui Xu Yan Liu Peng-Hai Tang Wei-Bin Liu
author_facet	Gang Yan Yao-Hui Xu Yan Liu Peng-Hai Tang Wei-Bin Liu
author_sort	Gang Yan
title	Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
title_short	Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
title_full	Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
title_fullStr	Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
title_full_unstemmed	Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
title_sort	evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/40292813f5c247a7aaaa9bb64a621017
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Evolution and organic geochemical significance of bicyclic sesquiterpanes in pyrolysis simulation experiments on immature organic-rich mudstone

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