Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea

Abstract Three large-scale episodes of volcanic activity occurred during the Tertiary in the Xihu Depression, located in the East China Sea. Intermediate-felsic magmas intruded along faults and the associated hydrothermal fluids resulted in the hydrothermal alteration of the clastic country rock. To...

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Autores principales:	Yan Liu, Si-Ding Jin, Qian Cao, Wen Zhou
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Hydrothermal activities Erosion effects Clastic rock reservoir Secondary porosity Xihu Depression Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/c1f8fcc31c3c4d23815f1154a2e882b4
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spelling	oai:doaj.org-article:c1f8fcc31c3c4d23815f1154a2e882b42021-12-02T04:38:14ZTertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea10.1007/s12182-018-0292-41672-51071995-8226https://doaj.org/article/c1f8fcc31c3c4d23815f1154a2e882b42019-01-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-018-0292-4https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract Three large-scale episodes of volcanic activity occurred during the Tertiary in the Xihu Depression, located in the East China Sea. Intermediate-felsic magmas intruded along faults and the associated hydrothermal fluids resulted in the hydrothermal alteration of the clastic country rock. To better describe reservoir characteristics, reservoir samples were subjected to the following investigations: thin section examination, scanning electron microscope-energy dispersive spectrometer analysis (SEM–EDS), fluid inclusion homogenization temperature tests, vitrinite reflectance measurements, and X-ray diffraction. The results of this study provide evidence of the following hydrothermal alteration phenomena: brittle fracturing, clastic particle alteration, precipitation of unique hydrothermal minerals (celestite, zircon, apatite, barite, and cerous phosphate). The presence of abnormally high temperatures is indicated by fluid inclusion analysis, the precipitation of high-temperature authigenic minerals such as quartz, illite alteration, and anomalous vitrinite reflectance. Two aspects related to hydrothermal effects on reservoir properties have been investigated in this study: (1) Deep magmatic hydrothermal fluids carry large amounts of dissolved carbon dioxide and sulfur dioxide gas. These fluids percolate into the country rocks along fault zones, resulting in dissolution within the sandstone reservoirs and the development of significant secondary porosity. (2) Magma intrusions increase the temperature of the surrounding rocks and accelerate the thermal evolution of hydrocarbon source rocks. This results in the release of large amounts of organic acids and carbon dioxide, leading the dissolution of the aluminosilicate minerals and volcanic fragments in the reservoirs, and the generation of significant secondary porosity.Yan LiuSi-Ding JinQian CaoWen ZhouKeAi Communications Co., Ltd.articleHydrothermal activitiesErosion effectsClastic rock reservoirSecondary porosityXihu DepressionScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 1, Pp 14-31 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Hydrothermal activities Erosion effects Clastic rock reservoir Secondary porosity Xihu Depression Science Q Petrology QE420-499
spellingShingle	Hydrothermal activities Erosion effects Clastic rock reservoir Secondary porosity Xihu Depression Science Q Petrology QE420-499 Yan Liu Si-Ding Jin Qian Cao Wen Zhou Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
description	Abstract Three large-scale episodes of volcanic activity occurred during the Tertiary in the Xihu Depression, located in the East China Sea. Intermediate-felsic magmas intruded along faults and the associated hydrothermal fluids resulted in the hydrothermal alteration of the clastic country rock. To better describe reservoir characteristics, reservoir samples were subjected to the following investigations: thin section examination, scanning electron microscope-energy dispersive spectrometer analysis (SEM–EDS), fluid inclusion homogenization temperature tests, vitrinite reflectance measurements, and X-ray diffraction. The results of this study provide evidence of the following hydrothermal alteration phenomena: brittle fracturing, clastic particle alteration, precipitation of unique hydrothermal minerals (celestite, zircon, apatite, barite, and cerous phosphate). The presence of abnormally high temperatures is indicated by fluid inclusion analysis, the precipitation of high-temperature authigenic minerals such as quartz, illite alteration, and anomalous vitrinite reflectance. Two aspects related to hydrothermal effects on reservoir properties have been investigated in this study: (1) Deep magmatic hydrothermal fluids carry large amounts of dissolved carbon dioxide and sulfur dioxide gas. These fluids percolate into the country rocks along fault zones, resulting in dissolution within the sandstone reservoirs and the development of significant secondary porosity. (2) Magma intrusions increase the temperature of the surrounding rocks and accelerate the thermal evolution of hydrocarbon source rocks. This results in the release of large amounts of organic acids and carbon dioxide, leading the dissolution of the aluminosilicate minerals and volcanic fragments in the reservoirs, and the generation of significant secondary porosity.
format	article
author	Yan Liu Si-Ding Jin Qian Cao Wen Zhou
author_facet	Yan Liu Si-Ding Jin Qian Cao Wen Zhou
author_sort	Yan Liu
title	Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
title_short	Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
title_full	Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
title_fullStr	Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
title_full_unstemmed	Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea
title_sort	tertiary hydrothermal activity and its effect on reservoir properties in the xihu depression, east china sea
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/c1f8fcc31c3c4d23815f1154a2e882b4
work_keys_str_mv	AT yanliu tertiaryhydrothermalactivityanditseffectonreservoirpropertiesinthexihudepressioneastchinasea AT sidingjin tertiaryhydrothermalactivityanditseffectonreservoirpropertiesinthexihudepressioneastchinasea AT qiancao tertiaryhydrothermalactivityanditseffectonreservoirpropertiesinthexihudepressioneastchinasea AT wenzhou tertiaryhydrothermalactivityanditseffectonreservoirpropertiesinthexihudepressioneastchinasea
_version_	1718401148678832128

Tertiary hydrothermal activity and its effect on reservoir properties in the Xihu Depression, East China Sea

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