Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea

Although various geochemical and geophysical investigations have already indicated a great resource potential in the Xisha area of the South China Sea, the origin of organic matter and molecular evidence for tracing the migration of hydrocarbons from deep petroleum reservoirs are still lacking. In t...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Yan Li, Qian-Zhi Zhou, Xiang-Po Xu, Yun-Xin Fang, Jin-Zhong Liu, Jiang-Hai Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	source indication sedimentary organic matter biomarkers petroleum hydrocarbons Xisha area South China Sea Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/4b0f6fb5c3ef437eb2a736580ee6a6ca
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:4b0f6fb5c3ef437eb2a736580ee6a6ca
record_format	dspace
spelling	oai:doaj.org-article:4b0f6fb5c3ef437eb2a736580ee6a6ca2021-11-25T18:27:24ZSource Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea10.3390/molecules262268081420-3049https://doaj.org/article/4b0f6fb5c3ef437eb2a736580ee6a6ca2021-11-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/22/6808https://doaj.org/toc/1420-3049Although various geochemical and geophysical investigations have already indicated a great resource potential in the Xisha area of the South China Sea, the origin of organic matter and molecular evidence for tracing the migration of hydrocarbons from deep petroleum reservoirs are still lacking. In this study, systematic organic geochemical analyses, including bulk organic matter parameters and lipid biomarkers were performed for deep sediments from two cores. The C/N ratios and δ<sup>13</sup>C and δ<sup>15</sup>N values of organic matter in most of the samples, together with the maxima of short-chain <i>n</i>-alkanoic acids and mid-chain <i>n</i>-alkanols, high abundances of monounsaturated fatty acids C<sub>18:1ω9</sub> and C<sub>22:1ω13</sub>, jointly indicate the dominance of marine organic matter. <i>n</i>-Alkanes in sediments from core GMGS4-XH-W06B are characterized by small unresolved complex mixture (UCMs) humps, high odd/even predominance (OEP) and carbon preference index (CPI) values, clearly exhibiting characteristics of modern sediments. However, the sediments for core GMGS4-XH-W03B are featured with big UCMs, associated with OEP and CPI values around 1.0, showing signatures of petroleum hydrocarbons from high maturity sources. Considering the geologic background, the biomarker signatures are solid evidence for indicating the existence of underlying petroleum reservoirs, and may provide the valuable information for assessing the hydrocarbon resources in the Xisha area.Yan LiQian-Zhi ZhouXiang-Po XuYun-Xin FangJin-Zhong LiuJiang-Hai WangMDPI AGarticlesource indicationsedimentary organic matterbiomarkerspetroleum hydrocarbonsXisha areaSouth China SeaOrganic chemistryQD241-441ENMolecules, Vol 26, Iss 6808, p 6808 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	source indication sedimentary organic matter biomarkers petroleum hydrocarbons Xisha area South China Sea Organic chemistry QD241-441
spellingShingle	source indication sedimentary organic matter biomarkers petroleum hydrocarbons Xisha area South China Sea Organic chemistry QD241-441 Yan Li Qian-Zhi Zhou Xiang-Po Xu Yun-Xin Fang Jin-Zhong Liu Jiang-Hai Wang Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
description	Although various geochemical and geophysical investigations have already indicated a great resource potential in the Xisha area of the South China Sea, the origin of organic matter and molecular evidence for tracing the migration of hydrocarbons from deep petroleum reservoirs are still lacking. In this study, systematic organic geochemical analyses, including bulk organic matter parameters and lipid biomarkers were performed for deep sediments from two cores. The C/N ratios and δ<sup>13</sup>C and δ<sup>15</sup>N values of organic matter in most of the samples, together with the maxima of short-chain <i>n</i>-alkanoic acids and mid-chain <i>n</i>-alkanols, high abundances of monounsaturated fatty acids C<sub>18:1ω9</sub> and C<sub>22:1ω13</sub>, jointly indicate the dominance of marine organic matter. <i>n</i>-Alkanes in sediments from core GMGS4-XH-W06B are characterized by small unresolved complex mixture (UCMs) humps, high odd/even predominance (OEP) and carbon preference index (CPI) values, clearly exhibiting characteristics of modern sediments. However, the sediments for core GMGS4-XH-W03B are featured with big UCMs, associated with OEP and CPI values around 1.0, showing signatures of petroleum hydrocarbons from high maturity sources. Considering the geologic background, the biomarker signatures are solid evidence for indicating the existence of underlying petroleum reservoirs, and may provide the valuable information for assessing the hydrocarbon resources in the Xisha area.
format	article
author	Yan Li Qian-Zhi Zhou Xiang-Po Xu Yun-Xin Fang Jin-Zhong Liu Jiang-Hai Wang
author_facet	Yan Li Qian-Zhi Zhou Xiang-Po Xu Yun-Xin Fang Jin-Zhong Liu Jiang-Hai Wang
author_sort	Yan Li
title	Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
title_short	Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
title_full	Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
title_fullStr	Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
title_full_unstemmed	Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea
title_sort	source indication and geochemical significance of sedimentary organic matters from the xisha area, the south china sea
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4b0f6fb5c3ef437eb2a736580ee6a6ca
work_keys_str_mv	AT yanli sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea AT qianzhizhou sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea AT xiangpoxu sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea AT yunxinfang sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea AT jinzhongliu sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea AT jianghaiwang sourceindicationandgeochemicalsignificanceofsedimentaryorganicmattersfromthexishaareathesouthchinasea
_version_	1718411129988841472

Source Indication and Geochemical Significance of Sedimentary Organic Matters from the Xisha Area, the South China Sea

Ejemplares similares