摘要
复杂河流相油田沉积微相变化较快,平面上非均质性较强,物性变化大,水淹程度不均,水驱开发中剩余油分布规律复杂。结合渤海X油田开发地质资料,通过微观驱油模拟实验,研究了心滩、边滩、河道和溢岸沉积等4种沉积微相在不同注水倍数下的驱替特征、微观剩余油赋存状态及其在平面上的分布规律。研究结果表明,心滩沉积的采收率相对最高,剩余油分布以连片状和油滴状为主;边滩沉积的采收率略低,剩余油分布以连片状为主;河道沉积的采收率低于边滩沉积,剩余油分布以连片状为主;溢岸沉积的采收率相对最低,连片状剩余油占比超过80%,水驱波及范围小,剩余油富集,应成为挖潜的主要方向。
The sedimentary microfacies change rapidly in complex fluvial facies oilfield.As a result,the heterogeneity of the target layer is strong on the plane,and the physical properties of the target layer change greatly,resulting in the uneven degree of water flooding on the plane,and the distribution of remaining oil is relatively scattered,which greatly affects the remaining oil distribution.Based on the development geological data of X oilfield,the displacement characteristics,microscopic remaining oil occurrence and its horizontal distribution of four sedimentary microfacies,i.e.core beach,edge beach,channel and overflow bank,under different water injection ratios are studiedthrough micro displacement simulation experiment.The results show that the core beach deposit has the highest oil recovery,and the remaining oil distribution is mainly in the form of contiguous sheet and oil drop.The recovery rate of the beach deposits is slightly lower,and the remaining oil is mainly distributed in contiguous slices.The recovery factor of channel deposit is lower than that of bank deposit,and the distribution of remaining oil is mainly contiguous.The recovery rate of the overflow bank deposit is relatively low,and the proportion of the contiguous remaining oil is more than 80%.The water flooding sweep range is small,and the remaining oil is rich,which should be the main direction of tapping the potential.
作者
罗宪波
刘超
李金宜
LUO Xianbo;LIU Chao;LI Jinyi(Bohai Petroleum Research Institute,Tianjin Branch of CNOOC,Tianjin 300459,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2021年第3期6-9,34,共5页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”(2016ZX05058–001)
“渤海油田加密调整油藏工程技术研究”(2016ZX05025-001-007)。
关键词
辫状河沉积
沉积微相
微观驱替实验
剩余油分布
采收率
braided river deposits
sedimentary microfacies
micro displacement experiment
remaining oil distribution
recovery ratio
