摘要
为阐明砂砾岩储层复杂孔隙结构模态对微观剩余油的控制作用,在325块分析样品实验数据基础上,利用针对砂砾岩大颗粒的大铸体薄片分析、核磁共振复杂孔隙结构表征及CT三维立体孔隙空间扫描等技术,研究水驱/聚驱条件下砂砾岩复杂孔隙结构模态对剩余油的控制作用。结果表明:(1)水驱剩余油分布规律比较明显。水驱时含油饱和度在50%~100%所占频率下降快,优先被动用;(2)聚驱中后期,聚合物堵塞了部分水驱阶段形成的水流优势通道,形成活塞式的驱动导致含油饱和度在37.5%~50.0%被大量动用。聚驱后剩余油以孤立状分布为主,局部存在连片状;(3)不同孔隙结构模态在水驱/聚驱剩余油中差异较大。单模态、双模态岩心驱油效率较高,其中聚合物提高驱油效率为9.30%~18.38%。单模态岩心水驱油效率较高,而双模态和复模态岩心水驱油效率相当。聚合物提高驱油效率以双模态岩心最高,单模态次之。单模态和双模态岩心注入聚合物后,含水率下降可达20%。
The control effect of complex pore structure of glutenite reservoirs on remaining oil is very complicated and not clear.In this paper,based on the analysis data of 325 experimental samples,the control effect of complex pore structure modality on residual oil in water/polymer flooding is examined by means of large casting thin section,nuclear magnetic complex pore structure resonance and CT three-dimensional pore structure scanning.The results show that:(1)The distribution of remaining oil in water/polymer flooding follows some obvious patterns.The reservoirs with oil saturation in the range of 50%to 100%are displaced first,seeing quick decline in proportion.(2)In the middle and late stages of polymer flooding,some of the fluid advantage channels formed at the stage of water flooding,and the piston-type drive results in a large part of reservoirs with oil saturation in the range of 37.5%to 50.0%to be produced;the remaining oil is mainly in isolated distribution,and only in connected pieces in local parts.(3)Different pore structure modalities result in quite different oil displacement effects in water flooding/polymer flooding.The flooding efficiency in cores with single modality and dual modalities is higher,and the oil displacement efficiency of polymer is 9.30%to 18.38%after water flooding.Water flooding efficiency of single-modality core is the highest,while water flooding efficiencies of the dual-modality and complex modality cores are similar.The displacement efficiency with polymer is the highest in dual-modality cores,followed by single modality cores.The water content decreases by 20%after the cores with single-modality and dual-modality are injected with polymer.
作者
印森林
陈恭洋
陈玉琨
吴小军
YIN Senlin;CHEN Gongyang;CHEN Yukun;WU Xiaojun(Institute of Mud Logging Technology and Engineering,Yangtze University,Jingzhou 434023,Hubei,China;Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China)
出处
《岩性油气藏》
CSCD
北大核心
2018年第5期91-102,共12页
Lithologic Reservoirs
基金
国家自然科学基金项目"冲积扇储层孔隙结构复杂模态成因机制及其分布模式"(编号:41502126)
国家重大科技专项"我国含油气盆地深层油气分布规律与资源评价"(编号:2017ZX05008-006-004-002)
长江大学青年基金项目"冲积扇储层孔隙结构复杂模态成因机制"(编号:2015cqn55)联合资助
关键词
复模态
砂砾岩
聚合物驱替
剩余油
冲积扇
克拉玛依油田
complex modality
glutenite
polymer flooding
remaining oil
alluvial fan
Karamay Oilfield
