天然气地球科学

• 天然气地质学 • 上一篇    下一篇

阿联酋二叠系Khuff组气藏成藏模式与成藏过程分析

陈杰1,2,张剑3,方杰1,2   

  1. 1.中国石油川庆钻探工程公司地质勘探开发研究院,四川 成都 610051;
    2.中国石油海外天然气技术中心,四川 成都 610051;
    3.中国石油中东公司阿布扎比项目,阿联酋 阿布扎比 93785
  • 收稿日期:2016-10-20 修回日期:2017-02-28 出版日期:2017-04-10 发布日期:2017-04-10
  • 作者简介:陈杰(1980-),男,重庆人,高级工程师,硕士,主要从事碳酸盐岩油气藏地质综合研究. E-mail:chenj-sc@cnpc.com.cn.
  • 基金资助:

    中国石油川庆钻探工程有限公司科技项目“海外油气田快速评价技术研究”(编号:CQ2015B-7-1-1)资助.

Analysis of pool forming pattern and progress of Khuff Formation in UAE

Chen Jie1,2,Zhang Jian3,Fang Jie1,2   

  1. 1.Research Institute of Geology and Explore,Development of CCDC,Chengdu 610051,China;
    2.CNPC International Natural Gas Technology Center,Chengdu 610051,China;
    3.Abu Dhcbi Project,CNPC Middle East Company,Abu Dhabi 93785,UAE
  • Received:2016-10-20 Revised:2017-02-28 Online:2017-04-10 Published:2017-04-10

摘要:

二叠系Khuff组是中东地区最主要的天然气产层。阿联酋自20世纪70年代开展Khuff组勘探以来,发现了多个构造圈闭,但钻探测试效果不佳,陆上圈闭测试均为干层,海上圈闭测试气藏规模有限,非烃含量高,严重制约了下一步勘探工作。Khuff组气藏具有良好的生储盖组合,气源来自于下志留统Qusaiba组烃源岩;三叠系Sudair组泥灰岩和Khuff组中部的石膏层作为其盖层,分布稳定。在区域调研基础上,综合分析认为:气藏构造发育与烃源生排烃的时空耦合是影响阿联酋北部Khuff组气藏有效性的关键因素。综合多种资料建立的成藏模式表明:阿联酋海域Khuff组圈闭自二叠系沉积末期就受盐隆影响,构造开始发育,后期虽受阿卡迪亚、海西、扎格罗斯等多期构造运动影响,但圈闭依然保持完整,良好的生_运_聚匹配关系使得原油在侏罗纪充注其中;在晚白垩世,原油裂解成气,圈闭有效成藏;但受TSR作用影响,后期H2S和CO2等非烃气体大量发育。陆上Khuff圈闭则受扎格罗斯构造运动影响,于渐新世才开始发育,未能有效地捕获油气。

关键词: 成藏模式, Khuff组, 构造演化, 原油裂解气, 非烃气体

Abstract:

Khuff Formation of Permian is the most important gas production zone in Middle East.From 1970′s,the Khuff Formation exploration works had been carried out in UAE and few traps had been discovered.However,the exploration result is not good:all the onshore traps test are dry or with water;the offshore trap test have limited gas with lots of NHCG.It′s very difficult for the future exploration work for Khuff reservoir.Khuff reservoirs have good source,reservoir and cap.The Qusaiba hot shale is the source of Khuff reservoir;the Sudair muddy limestone and middle anhydrite in Khuff are both good cap rock for Khuff reservoir.Based on the analysis of comprehensive information,the key point of Khuff gas reservoir effectiveness is the structure development and the generation and migration of source.The pool forming pattern shows:the offshore trap was developed with salt swell in the early stage and effected by Acadian,Hercynian and Zagros structure movement in the late stage.The offshore Khuff trap kept integrated.In Jurassic,oil migrated to the offshore trap and accumulated;In Late Cretaceous,oil cracked into gas.Then the gas reservoir of offshore Khuff trap is effective.However,as the burial depth of Khuff Formation becomes more and more,more and more H2S and CO2 are generated due to TSR.The development of onshore traps began in Oligocene and was affected by Zagros structure movement.The trap formation time is later than that of the formation and migration of source,so the onshore Khuff traps have no gas.

Key words: Pool forming pattern, Khuff Formation, Structural evolution, Oil cracked gas, NHCG

中图分类号: 

  • TE122.2

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