天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

东海盆地西湖凹陷中部古近系地层水化学特征及地质意义

杨丽杰,侯读杰,陈晓东,刁慧   

  1. 1.中国地质大学(北京)能源学院,北京 100083;
    2.海相储层演化与油气富集机理教育部重点实验室,北京 100083;
    3.非常规天然气地质评价与开发工程北京市重点实验室,北京 100083;
    4.中海石油(中国)上海分公司,上海  200030
  • 收稿日期:2017-12-10 修回日期:2018-03-12 出版日期:2018-04-10 发布日期:2018-04-10
  • 通讯作者: 侯读杰(1964-),男,河南唐河人,教授,博士生导师,主要从事油藏地球化学和天然气地球化学研究. E-mail:hdj@cugb.edu.cn
  • 作者简介:杨丽杰(1994-),女,内蒙古赤峰人,硕士研究生,主要从事油气地质及地球化学研究.E-mail:2689411450@qq.com.
  • 基金资助:

    国家科技重大专项(编号:2016ZX05027-001-003)资助.

Chemical characteristics and geological significance of Palaeogene formationwater in central Xihu Depression,East China Sea Basin

Yang Li-jie,Hou Du-jie,Chen Xiao-dong,Diao Hu   

  1. 1.School of Energy Resources,China University of Geoscience (Beijing),Beijing 100083,China;
    2.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,Ministry
    of Education,Beijing 100083,China;3.Beijing Key Laboratory of Unconventional Natural Gas GeologicalEvaluation and Development Engineering,Beijing 100083,China;4.Shanghai Branch of CNOOC,Shanghai 200030,China
  • Received:2017-12-10 Revised:2018-03-12 Online:2018-04-10 Published:2018-04-10

摘要:

作为含油气盆地中与油气共存的重要流体,地层水化学特征对油气保存条件的评价具有重要意义。通过对西湖凹陷中部古近系平湖组和花港组可靠的地层水数据进行处理分析,发现古近系地层水具有矿化度较低,平均值为21 657.37mg/L,Na++K+、Cl-、HCO-3占优势,以NaHCO3水型为主,钠氯系数、脱硫系数、镁钙系数较大,变质系数较小等特征,反映出古近系地层水浓缩变质程度较弱,处于半开启—半封闭的区域水动力缓慢交替区。地层水的来源除湖盆的淡水—微咸水蒸发浓缩作用外,还存在海水沿开放型构造向下伏地层渗入造成与同沉积水混合而咸化的作用。盐岩的溶解是Na+、Cl-的主要成因,钠长石的高岭石化对HCO3- 的形成有重要贡献。对地层水化学组成变化与天然气藏分布关系研究表明,地层水矿化度低值区(<25 000mg/L)、NaHCO3型水分布区,钠氯系数为1~1.6分布区、脱硫系数低值区(<8)、变质系数为-80~-0.5分布区、镁钙系数低值区(<1.5)等区域更有利于天然气的保存。

关键词: 地层水, 水化学特征, 天然气藏, 古近系, 西湖凹陷

Abstract:

Formation water is an important fluid coexisting with oil and gas in petroliferous basins,its chemical characteristics are of great significance to the evaluation of oil and gas preservation conditions.Reliable Pinghu-Huagang Formations water data suggest that: The total dissolved solid (TDS) is low,with average of 21657.37mg/L.Na++K+,Cl-,HCO-3are dominant ions and water type is mainly NaHCO3 type,r(Na+)/r(Cl-),r(SO2-4)×100/r(Cl-),and r(Mg2+)/r(Ca2+) are high,and r(Cl--Na+)/r(Mg2+) is low.These characteristics reflect weak concentration and deterioration of formation water and it is in half open-half close regional hydrodynamic slow alternation zone.Except the evaporation and concentration of freshwater-brackish water of lake basin,the source of formation water also has salinization that seawater along the open structure infiltrates into synsedimentary water of underlying strata.Halite dissolution is mainly origin of Na+ and Cl-,kaolinization of albite makes important contribution to HCO3- formation.There are close relations between chemical compositions of the formation water and natural gas reservoirs.While the formation water is of low TDS(<25 000mg/L),NaHCO3 water type,low r(SO2-4)×100/r(Cl-) (<8),low r(Mg2+)/r(Ca2+) (<1.5) and r(Na+)/r(Cl- ) is at 1-1.6,r(Cl--Na+)/r(Mg2+) is from -80 to -0.5,there may be beneficial to preserve natural gas.

Key words: Formation water, Hydrochemical characteristics, Natural gas reservoirs, Palaeogene, Xihu Depression

中图分类号: 

  • TE122.1+13


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