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现代地质 ›› 2018, Vol. 32 ›› Issue (06): 1194-1202.DOI: 10.19657/j.geoscience.1000-8527.2018.06.08

• 石油地质学 • 上一篇    下一篇

鄂尔多斯盆地西峰油田长81储层微观孔隙结构特征及其对水驱油特征的影响

黎盼1(), 孙卫1, 王震2, 黄何鑫1, 折文旭1   

  1. 1.西北大学 大陆动力学国家重点实验室/地质学系,陕西 西安 710069
    2.中石化绿源地热能开发有限公司,河北 雄安 071800
  • 收稿日期:2017-12-05 修回日期:2018-05-23 出版日期:2018-12-10 发布日期:2018-12-20
  • 作者简介:黎 盼,女,博士研究生,1990年出生,油气田地质与开发专业,主要从事油气藏地质与开发研究。Email:122078558@qq.com
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(2011ZX05044);陕西省科技统筹创新工程项目(2015KTCL01-09);陕西省教育厅专项科研计划项目(15JK1063)

Features of Microscopic Pore Structure and Their Influence on Oil Displacement Efficiency in Chang 81 Reservoir of Xifeng Oilfield, Ordos Basin

LI Pan1(), SUN Wei1, WANG Zhen2, HUANG Hexin1, ZHE Wenxu1   

  1. 1. State Key Laboratory for Continental Dynamics, Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
    2. Sinopec Green Energy Geothermal Development Co.Ltd., Xiong’an, Hebei 071800, China
  • Received:2017-12-05 Revised:2018-05-23 Online:2018-12-10 Published:2018-12-20

摘要:

针对鄂尔多斯盆地西峰油田长81储层孔隙结构非均质性强、含水上升快、注水压力较高等问题,应用粒度、物性、X射线衍射、铸体薄片、扫描电镜、常规压汞、真实砂岩微观水驱油模型等实验资料,探讨了储层微观孔隙结构特征及其与水驱油效率的关系。根据毛管压力曲线特征形态及相应参数的分析,将长81储层孔隙结构分为A类、B类、C类、D类4种类型。研究表明,4种类型的孔隙结构对应的储集空间不同,水驱油路径和驱油效率具有明显的差异。喉道半径大小及分布形态是影响水驱油效率的关键;渗透率和孔隙度越高驱油效率越高。同时,储层岩石孔隙结构越好,水驱油效率也越高。综合分析表明,应用微观孔隙结构特征与水驱油效率的关系为寻找相对优势储层和提高油藏认识提供了可靠依据。

关键词: 微观孔隙结构, 水驱油渗流实验, 西峰油田, 物性, 孔隙结构类型

Abstract:

High heterogeneity in pore structure, rapid rise in water content and high pressure in water injection are reported at the Chang 81 reservoir in the Xifeng Oilfield, Ordos Basin. We present detailed experimental study on the features of the microscopic pore structure and its influence on the oil displacement efficiency. The techniques employed include grading analysis, physical property measurement, X-ray diffraction (XRD), thin section casting, SEM, high pressure mercury penetration and water-driven displacement test with real microscopic sandstone models. Based on the capillary pressure curve and its corresponding parameters, we divide the pore structures of Chang81 reservoir into four types, i.e.A, B, C and D. Our research shows that different pore structures correspond to different reservoir storage space. There are significant differences among the four types of the water flooding paths and oil displacement efficiency. Pore throat radius is the key that affects oil displacement efficiency. Oil displacement efficiency increases with permeability and porosity. Meanwhile, better reservoir rock pore structure correlates with higher oil displacement efficiency. Comprehensive analysis shows that the relationships between the feature of the microscopic pore structure and the oil displacement efficiency provide a reliable basis to find prospective reservoirs and enhance our understanding on them.

Key words: micro-pore structure, water flooding seepage experiment, Xifeng Oilfield, reservoir property, pore structure type

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