基于模拟退火的曲流河复合点坝建模新方法

A new modeling method of meandering river complex point bars based on simulated annealing

文中提出了一种基于模拟退火的曲流河复合点坝建模新方法。与基于目标和基于沉积过程的方法相比,新方法更加灵活,易于条件化;与两点统计建模和多点统计建模相比,新方法可更好地再现复杂的河道特征;与基于构型精细解剖的确定性建模方法相比,新方法适用于井网稀疏的情况。新方法通过逐步模拟河道中线、活动河道和串珠状点坝,从串珠状点坝随机抽取单一点坝建立了8种单一点坝模型,将这8种单一点坝模型作为随机模拟时单一点坝生成、删除和移动操作对象,采用模拟退火的策略较好地再现了复合点坝三维分布。在真实现代沉积和中国东部某油田实际工区中应用新方法,证明了新方法的合理性和对真实油田数据的适用性。

A new method for modeling a meandering river complex point bars based on simulated annealing is proposed in this paper.Compared with target-based and deposition process-based methods,the new method is more flexible and easier to condition.Compared with two-point statistical modeling and multi-point statistical modeling,the new method can better reproduce complex channel characteristics.Compared with the deterministic modeling method based on fine architecture anatomy,the new method is suitable for the sparse well situation.The new method establishes eight types of single point bar models by randomly selecting single point bar from the bead-like point bars by gradually simulating the centerline of the river channel,the active channel,and the bead-like point bars,and uses these eight types of single point bar models as operation objects of single point bar generating,deleting and moving in stochastic simulation.The three-dimensional distribution of the complex point bars is better reproduced by the strategy of simulated annealing.The application of the new method to real modern deposits and actual work area of an oil field in eastern China demonstrates the rationality of the new method and its applicability to real oil field data.