Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits

Fine-grained mass-transport deposits (MTDs), especially their compressional toe zones, are traditionally considered as effective seal in constraining the vertical fluid migration underneath. However, this study documents thrust faults at the compressional toe zone of fine-grained MTDs that could dis...

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Autores principales:	Qiliang Sun, Xinong Xie, Shiguo Wu, Guorui Yin
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	mass-transport deposits thrust fault hydrocarbon leakage block South China Sea Science Q
Acceso en línea:	https://doaj.org/article/a6ccf228cecc4866af03686642d81f82
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spelling	oai:doaj.org-article:a6ccf228cecc4866af03686642d81f822021-11-17T07:01:20ZThrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits2296-646310.3389/feart.2021.764319https://doaj.org/article/a6ccf228cecc4866af03686642d81f822021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.764319/fullhttps://doaj.org/toc/2296-6463Fine-grained mass-transport deposits (MTDs), especially their compressional toe zones, are traditionally considered as effective seal in constraining the vertical fluid migration underneath. However, this study documents thrust faults at the compressional toe zone of fine-grained MTDs that could disaggregate the seal competence and promote vertical fluid flow. The investigated MTD referred to as MTD-a lies directly over a large hydrocarbon reservoir that is located within the Central Canyon of northern South China Sea, which is examined by using high-resolution 3D seismic and borehole data. Thrust faults and irregular blocks composed of coarse-grained sandstones are observed in the compressional zone of the MTD-a’s toe. More importantly, seismic evidence (e.g., enhanced seismic reflections) suggests that a large amount of hydrocarbons from the underlying reservoir penetrated through the MTD-a along these thrust faults and charged into the coarse-grained sandstone blocks. This clear evidence of thrust faults compromising the MTD’s seal effectiveness and thus facilitating the vertical fluid flow through the non-permeable strata demonstrate the importance of reassessing the seal capacity of MTD.Qiliang SunQiliang SunXinong XieShiguo WuGuorui YinFrontiers Media S.A.articlemass-transport depositsthrust faulthydrocarbon leakageblockSouth China SeaScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	mass-transport deposits thrust fault hydrocarbon leakage block South China Sea Science Q
spellingShingle	mass-transport deposits thrust fault hydrocarbon leakage block South China Sea Science Q Qiliang Sun Qiliang Sun Xinong Xie Shiguo Wu Guorui Yin Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
description	Fine-grained mass-transport deposits (MTDs), especially their compressional toe zones, are traditionally considered as effective seal in constraining the vertical fluid migration underneath. However, this study documents thrust faults at the compressional toe zone of fine-grained MTDs that could disaggregate the seal competence and promote vertical fluid flow. The investigated MTD referred to as MTD-a lies directly over a large hydrocarbon reservoir that is located within the Central Canyon of northern South China Sea, which is examined by using high-resolution 3D seismic and borehole data. Thrust faults and irregular blocks composed of coarse-grained sandstones are observed in the compressional zone of the MTD-a’s toe. More importantly, seismic evidence (e.g., enhanced seismic reflections) suggests that a large amount of hydrocarbons from the underlying reservoir penetrated through the MTD-a along these thrust faults and charged into the coarse-grained sandstone blocks. This clear evidence of thrust faults compromising the MTD’s seal effectiveness and thus facilitating the vertical fluid flow through the non-permeable strata demonstrate the importance of reassessing the seal capacity of MTD.
format	article
author	Qiliang Sun Qiliang Sun Xinong Xie Shiguo Wu Guorui Yin
author_facet	Qiliang Sun Qiliang Sun Xinong Xie Shiguo Wu Guorui Yin
author_sort	Qiliang Sun
title	Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
title_short	Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
title_full	Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
title_fullStr	Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
title_full_unstemmed	Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits
title_sort	thrust faults promoted hydrocarbon leakage at the compressional zone of fine-grained mass-transport deposits
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/a6ccf228cecc4866af03686642d81f82
work_keys_str_mv	AT qiliangsun thrustfaultspromotedhydrocarbonleakageatthecompressionalzoneoffinegrainedmasstransportdeposits AT qiliangsun thrustfaultspromotedhydrocarbonleakageatthecompressionalzoneoffinegrainedmasstransportdeposits AT xinongxie thrustfaultspromotedhydrocarbonleakageatthecompressionalzoneoffinegrainedmasstransportdeposits AT shiguowu thrustfaultspromotedhydrocarbonleakageatthecompressionalzoneoffinegrainedmasstransportdeposits AT guoruiyin thrustfaultspromotedhydrocarbonleakageatthecompressionalzoneoffinegrainedmasstransportdeposits
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Thrust Faults Promoted Hydrocarbon Leakage at the Compressional Zone of Fine-Grained Mass-Transport Deposits

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