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精细油藏描述关键在于建立能够定量描述和表征油藏储集层及流体的油藏地质模型。孤岛油田西区馆陶组油藏属于河流相沉积 ,砂体分布零散 ,横向变化大 ,建立准确地质模型难度较大。应用先进的随机地质建模技术 ,确定了孔隙度、渗透率、含油饱和度的三维变异函数 ,优选指数模拟为最佳建模方法 ,建立了该区储集层参数三维地质模型 ,较好反映了储集层参数空间变化的非均质性。通过研究 ,主要有以下认识 :①随机模拟的基础是求准变异函数 ,求准变异函数不但能直接评价储集层的非均质性 ,而且其准确程度直接影响模拟结果的精度 ;②强调地质约束 ,必须在充分认识地质规律的基础上 ,经过多种方法校验 ,选择合适的地质模型 ;③由于随机模拟方法本身的特殊性和地质条件的差异性 ,目前较成功的方法和实例往往只用于特定储集层 ,因此模拟难度较大 ,必须不断探索 ,总结经验 ;④只有把随机模拟技术应用到从勘探到开发的全过程中 ,并且与油藏数值模拟技术充分结合起来 ,其优越性才能充分发挥。图 2参 2 (孙国摘 )
The key to fine reservoir description lies in establishing a reservoir geological model that can quantitatively describe and characterize reservoir reservoirs and fluids. The Guantao Formation reservoir in the west part of Gudao Oilfield belongs to fluvial facies sedimentation, with scattered sand body and large lateral variation. It is more difficult to establish accurate geological model. Based on the advanced stochastic geological modeling technique, the three-dimensional variation function of porosity, permeability and oil saturation is determined, and exponential modeling is the best modeling method. The 3D geological model of reservoir parameters in this area is established, which reflects well Heterogeneity of spatial variation of reservoir parameters. The main findings are as follows: (1) The basis of stochastic simulation is to find the quasi-variogram, and the quasi-variogram can not only directly evaluate the heterogeneity of the reservoir, but also the accuracy of the stochastic simulation directly affects the accuracy of the simulation results. Constraints must be based on a full understanding of geological laws, through a variety of methods to verify and select the appropriate geological model; Because of the particularity of the stochastic simulation method and the difference of geological conditions, the more successful methods and examples For a specific reservoir, so the simulation is more difficult, we must continue to explore and summarize the experience; ④ Only by applying stochastic simulation technology from exploration to development of the entire process, and reservoir numerical simulation technology fully integrated, its superior Sex can give full play. Figure 2 Senate 2 (Sun Guoxian)