石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (2): 334-344.doi: 10.11743/ogg20170213

• 油气地质 • 上一篇    下一篇

准噶尔盆地南缘吐谷鲁群盖层评价及对下组合油气成藏的意义

田孝茹1, 卓勤功2, 张健3, 胡瀚文1, 郭召杰1   

  1. 1. 北京大学 地球与空间科学学院 造山带与地壳演化教育部重点实验室, 北京 100871;
    2. 中国石油 勘探开发研究院, 北京 100083;
    3. 中国石油 新疆油田公司 勘探开发研究院, 新疆 乌鲁木齐 830013
  • 收稿日期:2015-11-30 修回日期:2016-07-02 出版日期:2017-04-28 发布日期:2017-05-04
  • 通讯作者: 郭召杰(1963-),男,教授,构造地质学和石油地质学。E-mail:zjguo@pku.edu.cn。 E-mail:zjguo@pku.edu.cn
  • 作者简介:田孝茹(1993-),女,博士研究生,构造地质学和石油地质学。E-mail:tianxr@pku.edu.cn。
  • 基金资助:
    国家科技重大专项(2017ZX05008-001);国家油气重大专项(2016ZX05003-0020);中国石油天然气股份有限公司科学研究与技术开发项目(2016B-0502)

Sealing capacity of the Tugulu Group and its significance for hydrocarbon accumulation in the lower play in the southern Junggar Basin,northwest China

Tian Xiaoru1, Zhuo Qingong2, Zhang Jian3, Hu Hanwen1, Guo Zhaojie1   

  1. 1. Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    3. Research Institute of Exploration and Development, PetroChina, Xinjiang Oilfield Company, Urumqi, Xinjiang 830013, China
  • Received:2015-11-30 Revised:2016-07-02 Online:2017-04-28 Published:2017-05-04

摘要: 通过分析准噶尔盆地南缘下储盖组合吐谷鲁群盖层岩性、泥岩累计厚度和泥岩单层厚度等宏观评价参数以及渗透率和排替压力等微观评价参数,认为下储盖组合主力盖层为呼图壁组,岩性表现为泥岩、粉砂质泥岩及泥质粉砂岩薄互层,泥地比以80%~95%为主,平均泥岩累计厚度为337 m,泥岩最大单层厚度达138 m。吐谷鲁群泥岩渗透率为(0.000 001 84~0.000 24)×10-3 μm2,排替压力为4.72~44.85 MPa,根据国内盖层封闭能力分类评价标准属Ⅰ-Ⅱ类盖层。通过恢复盖层排替压力的动态演化过程,认为泥岩封闭能力形成时期与烃源岩生、排烃时期具有较好的匹配关系,盖层能够封闭侏罗系烃源岩生成的石油及晚期生成的天然气,同时后期抬升运动及喜马拉雅构造活动产生的多条逆冲断层对盖层的封闭能力未产生较大影响。综合分析认为,吐谷鲁群盖层具有封闭大中型气田的能力。

关键词: 渗透率, 排替压力, 封闭性动态演化, 泥岩盖层, 吐谷鲁群, 准噶尔盆地

Abstract: Through the evaluation of macroscopic sealing parameters(lithology,mudstone accumulative thickness and single mudstone thickness) and microscopic sealing parameters(permeability and displacement pressure),this paper gives a comprehensive analysis of the sealing capacity of the Tugulu Group in the southern margin of Junggar Basin.The results show that the Hutubi Formation is the main cap and comprises interbedded mudstone,silt mudstone and pelitic siltstone.The shale stratum ratio,average mudstone accumulative thickness and maximum single mudstone thickness are 80%-95%,337 m and 138 m respectively.Permeability and displacement pressure of the Tugulu Group mudstone range from 0.000 001 84×10-3 μm2 to 0.000 24×10-3 μm2 and 4.72 MPa to 44.85 MPa respectively,suggesting type Ⅰ to Ⅱ sealing capacity based on the criteria for cap rock evaluation.By restoring the dynamic evolution of displacement pressure of cap rocks,the Tugulu Group is capable of sealing oil and late gas generated by the Jurassic source rock,because the timing of sealing capacity forming is well in tune with the timing of hydrocarbon generation and expulsion.Uplifting and thrust faults evolved during the Hemalaya Movement did not destroy the sealing capacity of the Tugulu Group.Through these comprehensive analysis,we conclude that cap rocks of the Tugulu Group maintains the capacity of sealing large to middle gas field.

Key words: permeability, displacement pressure, dynamic evolution of cap rock sealing capacity, mudstone cap rock, Tugulu Group, Junggar Basin

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