天然气地球化学

渤海海域新生界地层水化学特征及主控因素

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  • 中海石油(中国)有限公司天津分公司,天津 300459
赵志平(1986-),男,黑龙江大庆人,工程师,硕士,主要从事构造、油气地质研究.E-mail:zhaozhp2@cnooc.com.cn.

收稿日期: 2017-03-15

  修回日期: 2017-08-23

  网络出版日期: 2017-09-10

基金资助

国家自然科学基金(编号:41602111);国家科技重大专项课题“渤海海域勘探新领域及关键技术研究”(编号:2016ZX05024-003)联合资助.

Chemical characteristics of Neogene Formation water and the research of their key controlling factors in Bohai sea area

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  • CNOOC Tianjin Company,Tianjin 300459,China

Received date: 2017-03-15

  Revised date: 2017-08-23

  Online published: 2017-09-10

摘要

以渤海海域取自探井的1 254个地层水数据点为基础,总结了渤海海域地层水矿化度特征及水型分布规律,并探讨了其差异分布的控制因素。结果表明:渤海海域地层水矿化度整体表现出随埋深增加而增大的正向水化学剖面特征,在东营组顶部(1 750~2 000m)出现矿化度的淡化带,将新生界分成新近系和古近系2个次级正向水化学剖面;古气候条件与沉积环境控制了研究区地层水矿化度的宏观展布格局,研究区南部莱州湾凹陷古近系盐岩、膏岩的发育是研究区矿化度呈现南高北低的主要原因;深大断裂通过调节深部流体活动进一步控制了浅层地层水的平面差异展布;垂向上,2 480m作为化学分异面,形成了上、下2个水化学系统,上部系统受平原组沉积期以来的海水覆盖,加之新近纪沉积的巨厚地层,导致地层水矿化度升高,氯化钙型水相对富集,而表现出与陆上油区迥异的水化学特征;下部系统(沙三段—东二下亚段)受控于烃源岩大量生排烃作用,形成高矿化度碳酸氢钠型地层水。
 

本文引用格式

赵志平,官大勇,韦阿娟,刘朋波,付立 . 渤海海域新生界地层水化学特征及主控因素[J]. 天然气地球科学, 2017 , 28(9) : 1396 -1405 . DOI: 10.11764/j.issn.1672-1926.2017.08.016

Abstract

Based on the 1 254 formation water data points from exploratory well of Bohai sea area,distribution of formation water salinity and water type were summarized,and controlling factors of different distribution was discussed.The results showed that the formation water salinity presents a forward water chemistry profile,increasing with the increase of burial depth.Desalination belt appeared at the top of Dongying Formation,which divided Cenozoic into Neogene and Paleogene two secondary forward water chemistry profiles.The ancient climate conditions and the sedimentary environment controlled the macro distribution pattern of formation water salinity.Salt rock and plaster rock in Laizhouwan Sag were the reason why formation water salinity was high in south and low in north of the area.Through regulating deep fluids movements,deep faults resulted in different distribution of formation water in shallow layer.In vertical direction,there was two hydrochemical systems below and above the chemical differentiation surface in 2 480m,by reason of sea covering from Pingyuan period and great thickness of formation of Neogene.Formation water salinity increased and water of CaCl2 type gathered in top system,which was completely different from onshore oilfield in hydrochemical characteristics.In the lower system (E2s-E3dL2),for the reason of generation and expulsion in source-rock,formation water of NaHCO3 with a higher salinity formed.

 

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