高凝油油藏微观剩余油分布影响因素分析——以大民屯凹陷S84-A12块为例  

Analysis of Influencing Factors of Micro Remaining Oil Distribution of High Pour Point Oil Reservoir: a Case Study of S84-A12 Block in Damintun Depression

作　　者：张翔宇[1] ZHANG Xiang-yu(Exploration and Development Research Institute of Liaohe Oilfield Company,PetroChina,Panjin 124010,China)

机构地区：[1]中油辽河油田分公司勘探开发研究院,盘锦124010

出　　处：《科学技术与工程》2020年第20期8133-8138,共6页Science Technology and Engineering

摘　　要：高凝油藏剩余油分布状态决定了油藏的开发调整方式,但前人针对剩余油动态变化影响分析较少。由于油品的特殊性,含蜡量及开采驱替方式均会对储层孔隙结构进行改造从而影响微观剩余油的分布。基于此,利用高精度电子计算机断层扫描(computed tomography,CT)技术建立数字岩心模型,恢复微观孔隙结构,实验分析得出微观剩余油动态变化主要受含蜡量及驱替程度影响。随温度降低蜡滴析出加快,含蜡量增加从而分割孔隙中剩余油。驱替倍数提高,储层孔喉连通性提高,剩余油分布样式由块状、网络状向孤滴状变化。The distribution of remaining oil in high pour point reservoir determines the development adjustment mode of the reservoir, but researches on the factors that influence the dynamic change of remaining oil are few. Because of the particular oil properties, both the wax content and production displacement methods will modify the pore structure of reservoirs and affect the distribution of micro remaining oil. In this condition, a digital core model was established by using high precision computed tomography(CT) technology to restore micro-pore structure. The experimental analysis shows that the dynamic change of micro-residual oil is mainly affected by wax content and displacement degree. With the decrease of temperature, the precipitation of wax droplets speeds up, wax content increases and the remaining oil is divided in the pore. With the multiple increase of displacement, the connectivity of reservoir pore roar is improved and the distribution pattern of remaining oil varies from block, network to solitary drop.

关 键 词：高凝油 孔隙结构 含蜡量 驱替方式 剩余油 

分 类 号：TE122.2[石油与天然气工程—油气勘探]