储层构型单元无网格建模方法

Meshless modeling method for reservoir configuration units

针对常规基于网格的地质建模方法难以精确表征小尺度构型单元几何形态及切叠关系等问题,提出了一种储层构型单元无网格建模方法,即基于单井及平面构型得到的各类稀疏空间离散数据,在三维构型原型模型约束下,以三维包络面的形式重建各级次构型单元,使得模型更加符合地质体真实形态。利用构建的构型单元包络面,采用等效表征方法输出构型界面网格传导率,实现了构型单元在三维油藏数值模拟模型中的精细表征。渤海PL辫状河相油田应用结果表明,基于本文方法建立的新模型,有效提高了单井历史拟合精度及井间剩余油分布预测精度,历史拟合符合率较老模型提高12个百分点,剩余油总体预测精度达到85%以上。对于油田开发中后期的储层精细表征,本文方法具有良好的应用前景。

A meshless modeling method for reservoir configuration units was proposed to solve the problem that conventional mesh-based geological modeling methods are difficult to accurately characterize the geometric forms and cutting or overlapping relationship of small-scale configuration units.This method was based on all kinds of sparse space discrete data obtained from a single well and the plane configuration,and all levels of configuration units were reconstructed in the form of 3D envelope surface under the constraint of 3D configuration prototype model,so as to make the model more consistent with the real form of a geological body.The equivalent characterization method was used to output the mesh conductivity of the configuration interface based on the constructed envelope surface of configuration units,which realized the fine characterization of the configuration units in the 3D reservoir numerical simulation model.The application results of Bohai PL braided river facies oilfield show that the new model built based on this method can effectively improve the historical fitting accuracy of a single well and the prediction accuracy of residual oil distribution between wells,with the coincidence rate of historical fitting being 12 percent higher than that of the old model and the overall prediction accuracy of residual oil reaching more than 85%.The method presented in this paper has a good application prospect for fine reservoir characterization in the middle and late period of oilfield development.