天然气地球科学 ›› 2012, Vol. 23 ›› Issue (4): 727–735.doi: 10.11764/j.issn.1672-1926.2012.04.727

• 天然气地质学 • 上一篇    下一篇

波斯湾盆地Khuff组成藏组合地质特征

李浩武,童晓光   

  1. 1.中国石油勘探开发研究院,北京 100083;2.中国石油天然气海外勘探开发公司,北京 100034
  • 收稿日期:2012-01-04 修回日期:2012-02-21 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 李浩武lihaowu123@126.com. E-mail:lihaowu123@126.com.
  • 作者简介:李浩武(1979-),男,陕西蓝田人,工程师,博士,主要从事石油地质综合研究. E-mail:lihaowu123@126.com.
  • 基金资助:

    国家重大科技专项(编号:2008ZX-05028);中国石油天然气股份公司重大专项(编号:2008E-0501)联合资助.

Geological Characteristics of Gas Accumulation Combination of Persian Khuff Formation in Gulf Basin

LI Hao-wu,TONG Xiao-guang   

  1. 1.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China; 
    2.China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China
  • Received:2012-01-04 Revised:2012-02-21 Online:2012-08-10 Published:2012-08-10

摘要:

Khuff组成藏组合是波斯湾盆地最重要的天然气成藏组合,二叠系Khuff组储层和层间硬石膏盖层构成了成藏组合的基本要素。下志留统Qusaiba段热页岩是Khuff组成藏组合的烃源岩,其分布广、有机质含量高,在晚白垩世大面积成熟生烃,而大部分圈闭形成早于主生烃期,且基底断裂发育,充当了烃类由Qusaiba段热页岩向Unayzah组砂层运移的垂向通道,Unayzah储层充当了主要的油气平面运移通道;面积广阔、沉积相稳定的Khuff组内碳酸盐岩和硬石膏旋回层序既提供了储层,也提供了成藏组合内绝大部分气田的优质盖层。同时,储层的原始物性好,鲕粒、球粒、生物泥粒灰岩及粒屑灰岩都具有很好的印模孔隙和粒间孔隙,此外,后期的淋滤作用加上白云岩化产生的晶间孔隙极大地改善了储层的质量。在大部分区域内,后期断层活动并没有破坏盖层的封闭性,天然气资源的散失量小。Khuff组成藏组合的未来勘探地区主要分布在Qusaiba段烃源岩的成熟区内,最有潜力的地区为层间硬石膏与Qusaiba段烃源岩成熟区重合的部分,包括波斯湾水域、波斯湾西北部及加瓦尔油田以南地区。大型低幅度构造的识别是将来的重点工作之一,同时,由于中东地区油气勘探生产的经济门限较高,相对较小规模的油气藏的开发要依赖高气价的推动作用。

关键词: Khuff组成藏组合, Qusaiba段热页岩, 层间硬石膏, 后期淋滤, 白云岩化作用, 成藏主控因素, 勘探潜力;波斯湾盆地

Abstract:

The combination of source rock,reservoir and cap rock in the Persian Khuff Formation is the most important gas accumulation combination in the Persian Gulf   basin.Both Permian Khuff carbonate and interlayer anhydrite consist in the basic elements of gas accumulation combination of Persian Khuff Formation.The Silurian Qusaiba Formation hot shale is the source rock,with wide distribution,high TOCand moderate thermal maturity at late Craterous.The time of trap formation is  earlier than that of hydrocarbon generation window,and many basement faults take vertically a good passageway for hydrocarbon migration from Qusaiba hot shale to  Unayzah sandstone and the Unayzah sandstone make a lateral migration passageway.The cyclically deposited anhydrite and carbonates act the good cap rock and high   quality reservoir.The Khuff Formation reservoir rocks with good original property are composed of oolite,pellete,biodetritus packstone and grainstone,with good   moldic pore and interparticle pore.The action of leaching and dolomitization greatly improved the reservoir pore at later stage.In most area,the faults do not  make the cap rock loss the sealing,so little gas is lost.The potential area of gas exploration is in the overlay area of Qusaiba Formation mature source rock and  interlayer anhydrite,including West Arabian sub-basin,central-east part of Widyan-Mesopotamia sub-basin,northwest of Persian Gulf,and southern area of Ghawar oil   field.It is paid more attention in the future to identify the big traps with low closure.Additionally,for the high economy limit of exploration and development   in the Middle East,the production for small hydrocarbon reservoirs need the support of high oil price.

Key words: Gas accumulation combination of the Persian Khuff Formation, Qusaiba hot shale, Interlayer anhydrite, Later  , leaching;Dolomitization, Key , factors, Exploration potential, Persian Gulf basin

中图分类号: 

  • TE122

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