岩性油气藏 ›› 2021, Vol. 33 ›› Issue (2): 49–58.doi: 10.12108/yxyqc.20210206

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地临兴地区二叠系石盒子组储层特征

严敏1,2, 赵靖舟1,2, 曹青1,2, 吴和源1,2, 黄延昭3   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 西安石油大学 陕西省油气成藏地质学重点实验室, 西安 710065;
    3. 西北大学 地质学系, 西安 710069
  • 收稿日期:2020-06-23 修回日期:2020-09-07 出版日期:2021-04-01 发布日期:2021-03-31
  • 第一作者:严敏(1996—),女,西安石油大学在读硕士研究生,研究方向为油气成藏地质学。地址:(710065)陕西省西安市雁塔区西安石油大学地球科学与工程学院。Email:2113365437@qq.com。
  • 基金资助:
    陕西省自然科学基础研究计划项目“准连续型溶蚀-胶结作用致密机理：以苏里格地区二叠系砂岩为例”（编号：2020JQ-767）、陕西省教育厅重点科学研究计划项目“封闭-半封闭体系下成岩作用特征与砂岩致密成因机理研究：以苏里格气区二叠系为例”（编号：20JS128）和“砂岩成岩致密与天然气充注成藏的耦合关系：以鄂尔多斯盆地上古生界为例”（编号：17JS111）联合资助

Reservoir characteristics of Permian Shihezi Formation in Linxing area,Ordos Basin

YAN Min1,2, ZHAO Jingzhou1,2, CAO Qing1,2, WU Heyuan1,2, HUANG Yanzhao3   

  1. 1. College of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
    3. Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2020-06-23 Revised:2020-09-07 Online:2021-04-01 Published:2021-03-31

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摘要： 鄂尔多斯盆地东缘地区为新的开发区域，其致密储层的特征及控气作用研究对下一步勘探显得尤为重要。通过对测井曲线、岩心、铸体薄片和扫描电镜等资料的分析，对鄂尔多斯盆地东缘临兴地区二叠系石盒子组致密砂岩储层的岩石学特征，孔隙、物性特征以及成岩作用进行了研究。结果表明：研究区储层孔隙度集中在7%~9%，渗透率集中在0.2~0.9 mD，孔隙以微米级为主，属于致密储层。其中黏土胶结、压实作用均是储层致密化的主要原因，溶蚀作用可以改善储层，同时裂缝的发育亦可优化储层。值得注意的是，当黏土矿物体积分数 < 5%时，黏土矿物含量与孔隙度成正比，对储层起保护作用，如绿泥石可呈薄膜状包裹颗粒，保护原生孔隙。通过对砂体、储层品质指数的研究，认为研究区天然气藏纵向上主要受砂体展布、孔隙连通性、物性等因素综合控制，同时裂缝、构造等因素对气藏也有一定的影响。该研究成果对研究区天然气藏后期开发具有理论指导意义。

关键词: 储层特征, 物性影响因素, 储层品质指数, 控气作用, 二叠系, 石盒子组, 鄂尔多斯盆地东缘

Abstract: The eastern margin of Ordos Basin is a new development area,so it is very important to study the characteristics of tight reservoir and its gas control for the next exploration. Based on the analysis of logging curves,cores,cast thin section and scanning electron microscopy,the petrological characteristics,porosity, physical properties and diagenesis of tight sandstone reservoir of Permian Shihezi Formation in Linxing area of the eastern margin of Ordos Basin were studied. The results show that the reservoir porosity in the study area mainly ranges from 7% to 9%, and the permeability mainly ranges from 0.2 mD to 0.9 mD. The reservoir is dominated by micro pores,and it belongs to tight reservoir. Clay cementation and compaction are the main reasons for reservoir densification. Dissolution and the development of fractures can optimize the reservoir. When the clay mineral cement content is less than 5%,the clay mineral content is proportional to the porosity,which can protect the reservoir. Chlorite can wrap particles in a film shape to protect the reservoir. Through the study of sand body and reservoir quality index,it is considered that the natural gas reservoir in the study area is mainly controlled by sand body distribution,pore connectivity and physical properties in the vertical direction,and at the same time, fracture,and structure also have a certain impact on the gas reservoir. The research results have theoretical significance for the later development of natural gas reservoirs in the study area.

Key words: reservoir characteristics, influencing factors for reservoir properties, reservoir quality index, gas control, Permian, Shihezi Formation, eastern margin of Ordos Basin

中图分类号: 

  • TE122.1
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