渤海湾盆地埕北油田高采收率主控地质因素剖析

Analysis on the Main Controlling Geological Factors about High Recovery in Chengbei Oilfield,Bohai Gulf Basin

渤海湾盆地埕北油田为带有气顶和刚性水体的普通稠油油藏,表现出油井产能高、采油速度高、开发生产平缓等高效开发特点,目前水驱采出程度已达到42.8%,预测最终水驱技术采收率将超过60%,搞清该油田高采收率的主控因素对指导渤海湾盆地类似油田的开发具有重要意义。在对埕北油田高采收率评价的基础上,从该油田东二段油藏自身的优势地质特点、边部水体能量大小、储层微观渗流特性以及针对开发过程中暴露出的问题采取的及时调整对策等方面剖析了取得高采收率的主控原因。该油田开采的成功经验可为国内同类型油藏高效开发提供借鉴和技术指导。

Chengbei oilfield in bohai gulf basin is the ordinary heavy oil reservoir with gas cap and rigid bodies, showing the high efficient development characteristics such as high oil well productivity, high pro- duction rate. At present, the water flooding recovery degree has reached 42.8%, and the water flooding recovery will be predicted more than 60 %. It is very important to find the main controlling factors about oilfield high recovery ratio for guiding the development of similar oilfields in bohai gulf basin. On the basis of evaluating high recovery efficiency, the cuthors analyzed the main controlling factors of high oil recovery including its advantage geological characteristics in the east II reservoir, the size of edge water energy, the microscopic seepage features, and the timely adiust strategy from aiming at the problems exposed in the process of development, etc. The successful experience in Chengbei oilfield can provide reference and effi- cient development technical guidance for domestic similar reservoirs.