摘要
认识和掌握剩余油分布规律,即明确高含水后期剩余油所在的空间位置、规模及其与储集层非均质性、注采状况之间的关系,是进一步提高驱油效率及采收率的前提和基础。结合滩海地区埕海油田"海油陆采"开发现状,综合分析埕海油田剩余油平面、垂向分布特征,首次将埕海油田剩余油分布模式定义为"滩海模式",并划分为难以效益开采型、水驱滞留型和水驱优势型,其中难以效益开采型分为特殊岩性型和深层油藏型;水驱滞留型分为井网难以控制型、层间差异型、单向受效型、局部微构造型、河道砂边部尖灭型、长水平段水平井动用不均型;水驱优势型分为沉积韵律控制型、夹层遮蔽型、底水稠油油藏水锥型、沉积相带控制型。研究认为,埕海油田剩余油平面上呈孤岛状或条带状,纵向上受非均质性及沉积韵律影响,为下一步剩余油挖掘和提高埕海油田采收率提供了支撑。
Understanding and mastering the distribution law of remaining oil,that is,defining the spatial location and scale of remaining oil in the late stage of high water cut and its relationship with reservoir heterogeneity and injection-production status,is the premise and basis for further improving oil displacement efficiency and recovery factor.Combining with the development status of producing marine oil on land in Shallow Water area of Chenghai Oilfield,the horizontal and vertical distribution characteristics of remaining oil in Chenghai Oilfield were comprehensively analyzed.For the first time,the remaining oil distribution pattern in Chenghai Oilfield was defined as shallow water mode,which is divided into three types:difficult-to-benefit exploitation,water drive retention and water drive dominant type.Among them,the difficult-to-benefit exploitation type was divided into special lithology type and deep reservoir type.The water drive retention type was divided into uncontrollable well pattern,interlayer difference type,unidirectional effect type,local microtectonics type,river channel sand edge pinch-out type and the type of horizontal well production heterogeneity of long horizontal section.The water drive dominant type was divided into sedimentary rhythm control type,intercalation sheltering type,bottom water heavy oil reservoir water-cone type,and sedimentary facies belt control type.The results show that the remaining oil in Chenghai Oilfield distributes as isolated islands or strips on the plane,and is affected by heterogeneity and sedimentary rhythm in vertical direction,which provides support for further tapping potential of remaining oil and improving the recovery efficiency of Chenghai Oilfield.Therefore,the recovery efficiency of Chenghai Oilfield is improved.
作者
李宁
刘文钰
刘建锋
张静蕾
牟晓慧
唐和军
Li Ning;Liu Wenyu;Liu Jianfeng;Zhang Jinglei;Mou Xiaohui;Tang Hejun
出处
《录井工程》
2018年第4期87-92,103,共7页
Mud Logging Engineering
