“两步法”相控随机建模在延长油田储层描述中的应用

摘要

延长油田低渗透砂岩储层的地质建模具有储层描述资料少、精度低、不确定性因素多的特点。文中采用＂两步法＂相控随机建模技术,以密井网测井解释资料为基础,结合岩心分析、生产动态等已知信息,先建立相控岩相模型,再以此为约束条件进行孔、渗属性建模,来减少储层描述的不确定性。以延长油田BLC油区为例,应用＂两步法＂相控随机建模技术,建立了符合该油区实际生产状态的低渗透砂岩地质模型,为区块合理开发决策和改善油田开发效果提供了地质依据。%The geological modeling for low permeability sandstone reservoir in Yanchang Oilfield is characterized by lack of data,poor accuracy degree and more uncertainty factors for reservoir description.Based on dense well logging interpretation,the ＂two-step＂ facies-constrained stochastic modeling method combining with core analysis and production performance are used to establish the facies model,and then carry out the porosity and the permeability modeling,in order to decrease the uncertainty for reservoir description.Taking BLC oil region in Yanchang Oilfield as an example,the ＂two-step＂ facies-constrained stochastic modeling method is applied to establish the low permeability sandstone reservoir model suitable for the actual production status in this area,which provides geological foundation for reasonable development decision and improving development effect.