天然气地球科学

• 天然气地质学 • 上一篇    下一篇

致密砂岩气藏孔喉结构与可动流体赋存规律——以鄂尔多斯盆地苏里格气田西区盒8段、山1段储层为例

刘登科1,2,孙卫1,2,任大忠3,4,张茜1,2,明红霞1,2,陈斌1,2   

  1. 1.大陆动力学国家重点实验室,西北大学,陕西 西安 710069;
    2.西北大学地质学系,陕西 西安 710069;
    3.西部低渗_特低渗油田开发与治理教育部工程研究中心,西安石油大学,陕西 西安 710065;
    4.西安石油大学石油工程学院,陕西 西安 710065
  • 收稿日期:2016-06-10 修回日期:2016-10-16 出版日期:2016-12-10 发布日期:2016-12-10
  • 作者简介:刘登科(1991-),男,陕西白水人,博士研究生,主要从事油气地质与开发方面的研究. E-mail:liudengke02@126.com.
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05044);陕西省科技统筹创新工程计划项目(编号:2015KTCL01-09);陕西省自然科学基础研究计划_青年人才项目(编号:2016JQ4022)联合资助.

Features of pore-throat structures and movable fluid in tight gas reservoir: A case from the 8th member of Permian Xiashihezi Formation and the 1st member of Permian Shanxi Formation in the western area of Sulige Gasfield,Ordos Basin

Liu Deng-ke1,2,Sun Wei1,2,Ren Da-zhong3,4,Zhang Xi1,2,Ming Hong-xia1,2,Chen Bin1,2   

  1. 1.State Key Laboratory for Continental Dynamics,Northwest University,Xi’an 710069,China;
    2.Department of Geology,Northwest University,Xi’an 710069,China;
    3.Engineering Research Center of Western Low & Ultra-low Permeability Oilfield Development & Management,Ministry
    of Education,X i’an Shiyou University,Xi’an 710065,China;
    4.College of Petroleum Engineering,X i’an Shiyou University,Xi’an 710065,China
  • Received:2016-06-10 Revised:2016-10-16 Online:2016-12-10 Published:2016-12-10

摘要: 致密砂岩储层的研究中,可动流体赋存特征因能表征储层孔隙中流体的流动规律而备受重视。以鄂尔多斯盆地苏里格气田西区下石盒子组盒8段、山西组山1段核磁共振测试样品为研究对象,结合铸体薄片,扫描电镜,阴极发光,恒速压汞,黏土矿物X-射线衍射,高压压汞及气水相渗实验分析了研究区储层可动流体赋存特征,开展了可动流体赋存特征的影响因素研究.结果表明:研究区储层依据孔隙组合类型可分为粒间孔_溶孔型储层,溶孔_晶间孔型储层及孔隙+裂缝型储层,可动流体赋存能力及大孔喉发育情况依次变差;喉道越大且孔喉均质程度越好可动流体饱和度越高;储层亲水性能力提高造成水膜厚度增大导致喉道缩小甚至阻塞,可动流体饱和度降低。测井解释含气性与孔隙组合类型对应良好,为致密砂岩储层含气性评价提供了直接依据。

关键词: 核磁共振, 孔隙组合类型, 孔隙结构, 苏里格气田, 致密气储层

Abstract: In tight sandstone reservoirs,the study of accumulative regularity is very important in that it can represent flow regularity in pores.The movable fluid characteristics and the influence of micro-pore structures on it were studied by taking nuclear magnetic resonance as samples and supplemented by casting thin sections,scanning electron microscopic(SEM),cathode luminescence(CL),constant-rate mercury injection,clay mineral X-ray diffraction,high-pressure mercury injection and gas-water relative permeability experiments from the 8th member of Permian Xiashihezi Formation (He 8) and the 1st member of Permian Shanxi Formation (Shan 1) tight gas reservoirs in the western area of Sulige Gas Field as research objects.The study shows that,there are three types of reservoirs dominated by pore assembly types in research regions,including intergranular-dissolved pore type,dissolved-intercrystalline pore type and pore plus fracture type.The capacity of movable fluid occurrence becomes worse and the proportion of large pores decreases in turn.Movable fluid saturation is in positive correlation with the size of throats and pore-throat homogeneous degree.Hydrophilic enhancement contributes to the increment of thickness of water-film,which can block the throat and reduce the movable fluid saturation.The gas-bearing capacity predicted by well logging interpretations are well corresponding to pore assembly types,which provide a direct evidence to recognize the tight reservoir’s gas-bearing capacity.

Key words: Nuclear magnetic resonance, Pore assembly type, Pore structure, Sulige Gasfield, Tight gas reservoir

中图分类号: 

  • TE122.2

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