天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地乌审召地区山2亚段致密气“甜点”控因分析

朱立文,王震亮,张洪辉   

  1. 1.西北大学大陆动力学国家重点实验室/西北大学地质学系,陕西 西安 710069;
    2.中国石油西部钻探工程有限公司,新疆 乌鲁木齐 830026
  • 收稿日期:2018-04-08 修回日期:2018-07-09 出版日期:2018-08-10 发布日期:2018-08-10
  • 作者简介:朱立文(1985-),男,湖北枣阳人,博士研究生,主要从事油气田地质与开发研究.E-mail:julliven@126.com.
  • 基金资助:
    中国石油天然气集团公司工程技术统筹科技项目(编号:2016T-003-001)资助.
     

Analysis on the controlling factors of tight gas “sweet spot” ofShan2 sub-member in Wushenzhao area,Ordos Basin

Zhu Li-wen,Wang Zhen-liang,Zhang Hong-hui   

  1. 1.State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,China;
    2.Xibu Drilling Engineering Company Limited,CNPC,Urumqi 830026,China
  • Received:2018-04-08 Revised:2018-07-09 Online:2018-08-10 Published:2018-08-10

摘要:

在对苏里格气田东部乌审召地区的构造和气藏进行精细解剖的过程中,发现山2亚段局部存在规模较大的低幅构造圈闭,且对气水分布的控制作用明显。为进一步明确该地区山2亚段天然气富集控制因素,在铸体薄片、物性、压汞、扫描电镜和核磁共振等多种测试分析资料的基础上,对山2亚段储层、圈闭和气藏分布特征进行了探讨。结果表明:研究区山2亚段岩性主要为石英砂岩,孔隙度主体介于5%~10%之间,渗透率主体介于(0.1~10)×10-3μm2之间,属特低孔、特低渗—超低渗储层,但孔喉连通性较好,渗流能力较强。气藏圈闭类型为构造—岩性圈闭,整体呈似穹窿状。圈闭内气藏分布连续,构造高部位含气,低部位为边底水,构造对山2亚段天然气的聚集与成藏具有明显的控制作用。低幅构造和砂体共同控制了天然气的聚集和保存。

关键词: 构造&mdash, 岩性圈闭, &ldquo, 甜点&rdquo, 控制因素, 山2亚段, 致密砂岩气, 鄂尔多斯盆地

Abstract:

It is found that there is a typical low-amplitude structural trap and it has obvious controlling effect on the distribution of gas and water in Shan2 sub-member during the process of exploration and development in Wushenzhao area in the eastern Sulige Gasfield.In order to further clarify the controlling factors of gas accumulation of Shan2 sub-member in this area,the characteristics of reservoir,trap types and accumulation rule of gas reservoir are discussed on the basis of the analysis of the experimental data,such as thin section,physical property,mercury injection,SEM and NMR.The results showed that the lithology of Shan2 sub-member in the study area is mainly quartz sandstone,the porosity is mainly 5%-10% and the permeability is mainly (0.1-10)×103μm2,which belongs to extra-low porosity and extra-low permeability and even ultra-low permeability reservoirs.The connectivity of pore throats is fairly good and the seepage ability is relatively good,too.The type of gas reservoir trap is a structural-lithologic trap with a shape of quasi-domed.The distribution of gas reservoirs in the trap is continuous,and the high part of the trap is filled with gas and the low part is water.The geological structure does have obvious controlling effect on the accumulation of natural gas in the Shan2 sub-member.The accumulation and preservation of natural gas are controlled by both low-amplitude structures and sand bodies.

Key words: Structural-lithologic trap, Controlling factors of , “sweet spot”, Shan2 sub-member, Tight sandstone gas, Ordos Basin

中图分类号: 

  • TE122.3+1

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