随机建模技术在孤岛油田西区精细油藏描述中的应用  

The application of random modeling technology in fine reservoir description of the west area of Gudao oil field.

作　　者：孙国[1] 张兴平[1] 徐守余[2] 

机构地区：[1]胜利石油管理局地质科学研究院 [2]石油大学

出　　处：《石油勘探与开发》2000年第6期68-69,共2页Petroleum Exploration and Development

摘　　要：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 is building up the geologic model which can be used for quantitative description and expression to the reservoir sandstone and reservoir fluid. Guantao Formation of the west area of Gudao oil field is deposit of fluvial, which is characterized by scattered-distributing sandbody with rapid-variation in lateral. There are many difficulties in setting accurate geological model. By using advanced random geological modeling technology, we set up 3D-variation function of porosity, permeability and oil saturation. By optimizing the modeling methods, we employ index simulation to set up 3D geological model of the Guantao Formation, which could reflect the heterogeneous character of the reservoir parameters more precisely. From the study results, it is concluded that (1) the key to random modeling is to derive an exact variation function. Not only the exact variation function can evaluate the heterogeneity of reservoirs directly, but its degree of accuracy affects the accuracy of modeling effort; (2) Emphasis must be placed on the geologic constrain. It is imperative to select suitable geological model on the basis of understanding geological law completely and after full check using many methods; (3) the modeling is extremely difficult due to its specific characteristics of random modeling technology and difference between geological conditions, we can only use recent successful methods and examples on specified reservoirs. It must constantly study this difficult problem and sum up experiences; and (4) only by applying the random modeling technology to exploration and development and combining with the reservoir modeling technology can its superiority fully be manifested.

关 键 词：孤岛油田西区 随机建模技术 精细油藏描述 

分 类 号：TE321[石油与天然气工程—油气田开发工程]