角度不整合薄油环油藏数值模拟技术  

Numerical Simulation Method for Thin Oil Ring Reservoirs with Angular Unconformity

作　　者：廖荣凤[1] 李发有[1] 王光付[1] 叶双江[1] 张永庆[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《特种油气藏》2017年第4期94-97,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"南大西洋两岸被动陆缘盆地油气勘探开发与关键技术"(2016ZX05033003-004)

摘　　要：角度不整合气顶底水薄油环油藏因其油藏类型的特殊性,基于地层产状的顺层倾斜网格系统难以满足储层精细刻画和油藏数值模拟的精度要求。地质建模过程中,通过引入网格转换技术,将顺层倾斜网格系统转换为水平产状网格系统,减少了地质模型不整合面附近三角网格的数量,使后续数值模拟收敛性得到保证。在水平网格系统模型基础上,数值模拟采用"不等时、不等距"局部动态网格加密技术,成功实现薄油环油藏水平井近井地带网格随时加密与释放,在保证模拟精度的同时,计算时间与常规网格系统相比缩减了70%。该网格综合处理技术既能精细刻画角度不整合薄油环油藏储层特征,也能满足此类气顶底水薄油环油藏水平井开发精细模拟的需要。Bed parallel grid system for thin oil ring reservoir with angular unconformity, gas cap and bottom water based on attitude of stratum does not meet the requirement of fine reservoir characterization and the accuracy of nu- merical reservoir simulation because of the distinctiveness of this reservoir. Grid conversion is used to convert the bed parallel grid system into horizontal grid system during geological modelling so that triangular grids are reduced around plane of unconformity to ensure convergence of subsequent numerical simulation. Based on horizontal grid system model, local grid refinement with unequal time interval and unequal spacing is used in numerical simulation to achieve refinement and release of grids in immediate vicinity of horizontal wells in thin oil ring reservoirs at all times. The method not only ensures the simulation accuracy, but also reduces 70% of calculation time compared with conventional grid system. The comprehensive grid treatment method accurately describe the characteristics of thin oil ring reservoirs and meets the requirement of fine simulation of development with horizontal wells in thin oil ring reservoirs with gas cap and bottom water.

关 键 词：角度不整合 薄油环 网格转换 水平网格 动态网格加密 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]