西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

青西油田下白垩统下沟组致密油成藏条件

孙维凤1,2,3 *,宋岩2,3,4,公言杰2,3,桂丽黎2,3   

  1. 1. 中国矿业大学资源与地球科学学院,江苏徐州221116
    2. 中国石油勘探开发研究院,北京海淀100083
    3.“提高石油采收率”国家重点实验室,北京海淀100083
    4. 中国石油大学(北京)非常规天然气研究院,北京昌平102249
  • 出版日期:2015-12-01 发布日期:2015-12-01
  • 通讯作者: 孙维凤,E-mail:sunweifeng1986@163.com
  • 基金资助:

    中国石油重大科技专项(2012E 3303)。

Accumulation Conditions for Tight Oil in Xiagou Formation,Lower#br# Cretaceous,Qingxi Oilfield

Sun Weifeng1,2,3*, Song Yan2,3,4, Gong Yanjie2,3, Gui Lili2,3   

  1. 1. School of Resources and Geosciences,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China
    2. Research Institute of Exploration & Development,CNPC,Haidian,Beijing 100083,China
    3. State Key Laboratory of Enhanced Oil Recovery,Haidian,Beijing 100083,China
    4. College of Unconventional Natural Gas,China University of Petroleum(Beijing),Changping,Beijing 102249,China
  • Online:2015-12-01 Published:2015-12-01

摘要:

致密油资源是青西油田非常规油气中最现实、也是最容易获得突破的领域。从烃源岩、储层、盖层及储盖组
合等方面,深入探讨青西油田下白垩统下沟组致密油的成藏条件。结果表明:青西油田下白垩统下沟组和赤金堡组烃
源岩厚度较大,有机质丰度较高,干酪根类型较好,生烃潜力大;储层物性较差,为低孔低渗致密储层。但研究区内构
造活动强烈,不仅有利于形成富集油气的圈闭,而且还能改善储层的品质,发育的构造裂缝以及构造溶蚀裂缝是下白
垩统下沟组致密油藏的主要储集空间;下白垩统下沟组及中沟组泥岩、古近系泥岩和膏盐岩为主要盖层,生储盖组合
包括自生自储型和下生上储型两类。

关键词: 致密油, 成藏条件, 下白垩统下沟组, 青西油田, 裂缝

Abstract:

Tight oil is the most realistic and easiest unconventional resource in Qingxi Oilfield. This present study deeply
discusses the basic favorable accumulation conditions for the tight oil from source rocks,reservoirs,cap rocks and reservoircap
assemblages. The results show that the source rocks of Xiagou Formation and Chijinpu Formation have high hydrocarbon
potential,with large thickness,high content of organic matters and favorable kerogen type. The reservoir property is poor with
low porosity and low permeability. However,the intensive tectonic activities not only form favorable traps for the accumulation
of oil,but also improve the reservoir property. The tectonic fractures and corrosion fractures are the main accumulation spaces
for the tight oil in Lower Cretaceous Xiagou Formation. The Xiagou Formation and Zhonggou Formation mudstone,and the
Paleogene mudstone and gypsum-salt rock are the main cap rocks for the tight oil of Qingxi Oilfield. Besides,two types of
source-reservoir-cap assemblage are found and there are self product-self reservoir and lower product-upside reservoir.

Key words: tight oil, accumulation conditions, Lower Cretaceous Xiagou Formation, Qingxi Oilfield, fractures

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