侵入渗流模型算法设计及在油气成藏机理研究中的应用  

Algorithm design of invasion percolation model and its application in the study of oil and gas accumulation mechanism

作　　者：王朋岩[1] 吕晓 郭宗广 WANG PengYan;LÜXiao;GUO ZongGuang(Northeast Petroleum University,School of Earth Sciences,Daqing 163318,China)

机构地区：[1]东北石油大学地球科学学院,大庆163318

出　　处：《地球物理学进展》2021年第3期1122-1129,共8页Progress in Geophysics

基　　金：国家科技重大专项“全球重点地区非常规油气资源潜力分析与未来战略选区”(2011ZX05028-002)资助。

摘　　要：油气藏形成影响因素多、经历时间长,难以通过直观的手段再现油气运聚过程.侵入渗流数值模型可用于研究地下多孔介质中流体运移特征与规律.在国内外研究的基础上,探索二维、三维模型降维设计思路,把复杂多维模型转化为一维数组,简化计算流程,方便程序设计.采用二叉树排序方法设计了数据结构和计算模块,可以加速搜索进程,减少运移模拟时间.通过加载分形分析软件对模拟结果进行定量标定.应用键式侵入渗流模型讨论了非常规油气成藏过程.低地层倾角产生低浮力效果,低渗透储层造成运移阻力增大,结合大面积供烃过程,形成了形态复杂、分形值高、运移效率低的油气运移路径.常规油藏中储层非均质性与运移动力共同影响,控制储层内部油气分布规律和运移路径形态.算法改进后软件结构清晰,功能完备,同时便于修改和增减模块.键式侵入渗流数值模型可以用于研究成藏机理、分析油气分布规律,具有直观、灵活、科学的特点.There are many factors influencing the formation of oil and gas reservoir, and it is difficult to reproduce the process of oil and gas migration and accumulation by intuitive means.The characteristics and laws of fluid migration in underground porous media can be studied by using the numerical model of invasion percolation. On the basis of research at home and abroad, this paper explores the design idea of dimensionality reduction of two-dimensional and three-dimensional models, transforms the complex multi-dimensional model into one-dimensional array, simplifies the calculation process and facilitates the program design. The binary tree sorting method is used to design the data structure and calculation module, accelerate the search process and reduce the migration simulation time. The simulation results were calibrated quantitatively by the external fractal analysis software. The process of unconventional oil and gas accumulation is discussed by means of bond type invasion percolation model. The low dip angle of formation produces low buoyancy effect, and low permeability reservoir increases migration resistance. Combined with the process of hydrocarbon supply in large area, the oil and gas migration path with complex morphology, high fractal value and low migration efficiency is formed. The main characteristics of unconventional oil and gas accumulation are that the oil(gas) and water is not fully differentiated according to the density due to no effective migration. The heterogeneity of reservoir and migration power jointly control the migration path and distribution law of oil and gas in conventional reservoirs. The existence of relatively low permeability layer in conventional reservoirs makes the migration path complex and the migration efficiency low. Under the same conditions of hydrocarbon supply, the complexity of paths depends on the magnitude of migration power and the difference of reservoir physical properties. If the migration power is large, the influence of low permeability layer will be smaller

关 键 词：侵入渗流 编程 数据结构 二叉树算法 油气成藏 

分 类 号：P631[天文地球—地质矿产勘探]