储层构型单元无网格建模方法

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...

Meshless modeling method for reservoir configuration units

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.