Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield

The origin of formation water salinity variation in Chang 9 stratum, Jiyuan oilfield, Ordos basin is studied here. 91 formation water samples show that water salinity is characterized by a wide range and a complex plane distribution. In order to find out the main cause of such distribution complexit...

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Main Authors:	Cheng, Feng, Zhiqiang, Mao, Hua, Yang, Jinhua, Fui, Yujiang, Shi, Yumei, Cheng, Haitao, Zhang, Linlin, Niu, Muhammad Aqeel Ashraf
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2016
Online Access:	http://journalarticle.ukm.my/9564/ http://journalarticle.ukm.my/9564/ http://journalarticle.ukm.my/9564/1/02_Cheng_Feng.pdf

id	ukm-9564
recordtype	eprints
spelling	ukm-95642016-12-14T06:50:19Z http://journalarticle.ukm.my/9564/ Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield Cheng, Feng Zhiqiang, Mao Hua, Yang Jinhua, Fui Yujiang, Shi Yumei, Cheng Haitao, Zhang Linlin, Niu Muhammad Aqeel Ashraf, The origin of formation water salinity variation in Chang 9 stratum, Jiyuan oilfield, Ordos basin is studied here. 91 formation water samples show that water salinity is characterized by a wide range and a complex plane distribution. In order to find out the main cause of such distribution complexity and reveal the relationship between formation water and evolution of reservoir traps, core data, chemical analysis result of formation water and log data are analyzed from perspectives of diagenesis and tectonism. And then, their characteristics are presented as the followings. In high salinity area, tuffaceous mudstone interlayer is found growing. Besides, the condition of Na++K+ is opposite to that of Ca2+, for its rate of concentration increase slows down with total salinity accumulating. In low salinity area, while, with fracture and faults developing, some formation water of CaCl2 type turns into MgCl2, NaHCO3 or Na2SO4 type. The cause is thus proposed to be composed of two aspects. One covers tuff alteration and later diagenesis for the high salinity. To be specific, montmorillonite, developed from tuff alteration, absorbs cation selectively and then ions migrate, during which more Na++K+ get lost, while more Ca2+ reserved. Afterwards, those reserved Ca2+ get released with montmorillonite transforming to illite, which results in a loss of Na++K+ and accumulation of Ca2+. Lots of ions are released into formation water during that process and later diagenetic process, which leads to the high water salinity. The other aspect is the development of faults and fractures, through which, the upper low salinity formation water gets connected. And that is the main cause of low salinity. At last, geological significance is discussed from two angles. Firstly, tuff alteration and later diagenesis are pivotal to reservoir reconstruction; and secondly, faults and fractures play an important role in oil transportation and storage. Universiti Kebangsaan Malaysia 2016-01 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/9564/1/02_Cheng_Feng.pdf Cheng, Feng and Zhiqiang, Mao and Hua, Yang and Jinhua, Fui and Yujiang, Shi and Yumei, Cheng and Haitao, Zhang and Linlin, Niu and Muhammad Aqeel Ashraf, (2016) Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield. Sains Malaysiana, 45 (1). pp. 9-18. ISSN 0126-6039 http://www.ukm.my/jsm/malay_journals/jilid45bil1_2016/KandunganJilid45Bil1_2016.htm
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The origin of formation water salinity variation in Chang 9 stratum, Jiyuan oilfield, Ordos basin is studied here. 91 formation water samples show that water salinity is characterized by a wide range and a complex plane distribution. In order to find out the main cause of such distribution complexity and reveal the relationship between formation water and evolution of reservoir traps, core data, chemical analysis result of formation water and log data are analyzed from perspectives of diagenesis and tectonism. And then, their characteristics are presented as the followings. In high salinity area, tuffaceous mudstone interlayer is found growing. Besides, the condition of Na++K+ is opposite to that of Ca2+, for its rate of concentration increase slows down with total salinity accumulating. In low salinity area, while, with fracture and faults developing, some formation water of CaCl2 type turns into MgCl2, NaHCO3 or Na2SO4 type. The cause is thus proposed to be composed of two aspects. One covers tuff alteration and later diagenesis for the high salinity. To be specific, montmorillonite, developed from tuff alteration, absorbs cation selectively and then ions migrate, during which more Na++K+ get lost, while more Ca2+ reserved. Afterwards, those reserved Ca2+ get released with montmorillonite transforming to illite, which results in a loss of Na++K+ and accumulation of Ca2+. Lots of ions are released into formation water during that process and later diagenetic process, which leads to the high water salinity. The other aspect is the development of faults and fractures, through which, the upper low salinity formation water gets connected. And that is the main cause of low salinity. At last, geological significance is discussed from two angles. Firstly, tuff alteration and later diagenesis are pivotal to reservoir reconstruction; and secondly, faults and fractures play an important role in oil transportation and storage.
format	Article
author	Cheng, Feng Zhiqiang, Mao Hua, Yang Jinhua, Fui Yujiang, Shi Yumei, Cheng Haitao, Zhang Linlin, Niu Muhammad Aqeel Ashraf,
spellingShingle	Cheng, Feng Zhiqiang, Mao Hua, Yang Jinhua, Fui Yujiang, Shi Yumei, Cheng Haitao, Zhang Linlin, Niu Muhammad Aqeel Ashraf, Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
author_facet	Cheng, Feng Zhiqiang, Mao Hua, Yang Jinhua, Fui Yujiang, Shi Yumei, Cheng Haitao, Zhang Linlin, Niu Muhammad Aqeel Ashraf,
author_sort	Cheng, Feng
title	Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
title_short	Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
title_full	Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
title_fullStr	Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
title_full_unstemmed	Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield
title_sort	origin of formation water salinity variation and its geological significance in chang 9 stratum, jiyuan oilfield
publisher	Universiti Kebangsaan Malaysia
publishDate	2016
url	http://journalarticle.ukm.my/9564/ http://journalarticle.ukm.my/9564/ http://journalarticle.ukm.my/9564/1/02_Cheng_Feng.pdf
first_indexed	2023-09-18T19:55:12Z
last_indexed	2023-09-18T19:55:12Z
_version_	1777406482886688768

Origin of formation water salinity variation and its geological significance in Chang 9 Stratum, Jiyuan Oilfield

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