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。
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 displace-ment 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.
作者
黎盼
孙卫
王震
黄何鑫
折文旭
LI Pan;SUN Wei;WANG Zhen;HUANG Hexin;ZHE Wenxu(State Key Laboratory for Continental Dynamics,Department of Geology,Northwest University,Xian,Shaanxi 710069,China;Sinopec Green Energy Geothermal Development Co.Ltd..Xiong'an,Hebei 071800,China)
出处
《现代地质》
CAS
CSCD
北大核心
2018年第6期1194-1202,共9页
Geoscience
基金
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)
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
micro-pore structure
water flooding seepage experiment
Xifeng Oilfield
reservoir property
pore structure type
