天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地东部大面积致密碳酸盐岩气地质特征及成藏条件分析

魏新善1,2,陈娟萍1,2,张道锋1,2,闫小雄1,2,任军锋1,2,严婷1,2   

  1. 1.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018;
    2.低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
  • 收稿日期:2016-08-31 修回日期:2017-04-11 出版日期:2017-05-10 发布日期:2017-05-10
  • 作者简介:魏新善(1962-),男,陕西宝鸡人,高级工程师,博士,主要从事天然气勘探生产和综合地质研究. E-mail:wxs_cq@petrochina.com.cn.
  • 基金资助:

    国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(编号:2016ZX05044);国家科技重大专项“鄂尔多斯盆地奥陶系_元古界成藏条件研究与区带目标评价”(编号:2016ZX05004006)联合资助.

Geological characteristics and reservoir forming conditions of large area tight carbonate gas in eastern Ordos Basin,China

Wei Xin-shan1,2,Chen Juan-ping1,2,Zhang Dao-feng1,2,Yan Xiao-xiong1,2,Ren Jun-feng1,2,Yan Ting1,2   

  1. 1.Exploration and Development Institute of Changqing Oilfield Company,CNPC,Xi'an 710018,China;
    2.National Engineering Laboratory of Exploration & Development of Low PermeabilityOil/Gas Fields,Xi‘an 710018,China
  • Received:2016-08-31 Revised:2017-04-11 Online:2017-05-10 Published:2017-05-10

摘要:

基于非常规气理念,以鄂尔多斯盆地东部奥陶系马家沟组马五1+2亚段碳酸盐岩储层为例,采用露头、岩心、铸体薄片、孔隙度、渗透率、同位素和试气成果资料综合分析的方法,重新认识和评价其含气潜力。结果表明,储层以泥粉晶—粗粉晶白云岩为主,渗透率小于0.1×10-3μm2的储层占80%以上,孔隙类型主要为裂缝—溶孔、裂缝—晶间孔,非均质性强,属于致密碳酸盐岩储层。气藏具有低丰度大面积分布、异常低压、无边底水、无自然产能、产水少等特点,属于碳酸盐岩致密气藏。天然气分布主要受控于大范围稳定分布的特殊的镶嵌式源储组合和平缓的单斜构造背景,勘探潜力较大,是海相碳酸盐岩天然气勘探的一种新类型。

关键词: 鄂尔多斯盆地, 白云岩, 致密储层, 致密气, 镶嵌式源储组合

Abstract:

Based on the concept of unconventional gas,a case study was performed on the Ordovician Majiagou Formation M51+2 carbonate reservoir in the eastern Ordos Basin.According to the comprehensive analysis of outcrop,core,casting thin sections,porosity,permeability,isotope,test analysis results of gas,the gas potential was evaluated.Results show,the reservoir is dominated by mud powder and coarse powder dolomite;Reservoirs with permeability less than 0.1×10-3μm2 account for more than 80%;The pore types are mainly composed of fracture-dissolution pore and the fracture-intergranular pore;Strong heterogeneity,which belong to tight carbonate reservoir,gas reservoir has the characteristics of low abundance and wide distribution,subnormal pressure,no border and bottom water,low natural production;Produce less water,which belong to tight carbonate gas reservoir.The distribution of natural gas is mainly controlled by a wide range of stable distribution of special mosaic type source reservoir combination and gentle slope structure background.It is expected to have great exploration potential and will be a new type of marine carbonate exploration.

Key words: Ordos Basin, Dolomite, Tight reservoir, Tight Gas, Mosaic type source reservoir combination

中图分类号: 

  • TE122.2

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