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高含水期微观剩余油赋存规律——以大港油田小集区块和港西区块为例 被引量:11

Occurrence Laws of Microscopic Remaining Oil in High Water⁃Cut Reservoirs:A Case Study on Blocks Xiaoji and Gangxi in Dagang Oilfield
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摘要 为了厘清开发后期高含水储集层内部微观剩余油分布特征,指导大港油田小集区块和港西区块油藏后续剩余油精细挖掘,利用紫外荧光体视显微镜进行观察,经图像处理后,将剩余油划分为弱波及、中波及和强波及3个级别,剩余油赋存状态划分为簇状、孔表薄膜状、狭缝状、角隅状和粒间吸附状5种。在高含水阶段,不同的剩余油赋存状态中,剩余油含量从高到低依次为簇状、孔表薄膜状、角隅状、粒间吸附状和狭缝状;聚/表复合驱后簇状剩余油和孔表薄膜状剩余油较多,后续可采用改善岩石润湿性的方法开采;砾岩剩余油分布较砂岩更加复杂,簇状剩余油和粒间吸附状剩余油较砂岩多,后续应考虑采用控制注入流体流度的方法开采。 In order to describe the microscopic distribution of remaining oil in high watercut reservoirs during the late development stage,and guide subsequent fine development of remaining oil in blocks Xiaoji and Gangxi in Dagang oilfield,remaining oil data was observed under an ultraviolet fluorescent stereo microscope and then was processed,and finally the distribution of the remaining oil is divided into three levels,namely,weak sweep,medium sweep and strong sweep,and the occurrence states of the remaining oil are divided into five types,namely,cluster shape,poresurface film shape,slit shape,corner shape and intergranular adsorption.In the high watercut stage,the content of the remaining oil in different occurrence state is in the order of cluster,poresurface film,corner,intergranular adsorption to slit shapes from high to low.After poly/surface compound flooding,remaining oil occurrences like clusters and poresurface films are dominant.Such remaining oil could be exploited by improving rock wettability.The distribution of remaining oil in conglomerate is more complex than that in sandstone.Remaining oil in sandstone are almost distributed as clusters and intergranular adsorption,which can be exploited by controlling the fluidity of injected fluid.
作者 李宜强 张津 潘登 燕云 刘明熹 曹涵 高文彬 LI Yiqiang;ZHANG Jin;PAN Deng;YAN Yun;LIU Mingxi;CAO Han;GAO Wenbin(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Research Institute of Exploration and Development,Dagang Oilfield Company,PetroChina,Tianjin 300280,China)
出处 《新疆石油地质》 CAS CSCD 北大核心 2021年第4期444-449,共6页 Xinjiang Petroleum Geology
基金 国家自然科学基金(51374221) 中国石油“十三五”油气田开发科技项目(kt2018-11-01-03)。
关键词 大港油田 高含水 微观剩余油 赋存规律 紫外荧光 水驱 聚/表复合驱 Dagang oilfield high water cut microscopic remaining oil occurrence law ultraviolet fluorescence water flooding poly/sur⁃face compound flooding
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