哈萨克斯坦盐下油藏双重介质三维地质建模

3D geological modeling of dual porosity carbonate reservoirs:A case from Kenkiyak pre-salt oilfield,Kazakhstan

以哈萨克斯坦肯基亚克盐下石炭系油藏为例,在详细岩心观察基础上,综合取心、测井、地质、地震等多方面资料,分步建立了双重介质储集层的三维地质模型。首先建立研究区构造模型,利用地震相和测井相分析建立沉积相模型,在数据结构分析和方法优选的基础上,建立相控的储集层基质属性模型;第二步利用地震几何属性分析和岩心裂缝描述结果,模拟建立裂缝分布网络模型;第三步将基质属性和裂缝分布网络模型有机结合,利用基质和裂缝渗流交换原理建立双重介质储集层三维综合地质模型。建模最终给出了裂缝的网络分布模型,裂缝的等效渗透率和双重介质等效渗透率模型,可直接提供给油藏工程研究人员开展数值模拟研究。

The 3D geological model of dual porosity reservoirs in the Kenkiyak pre-salt oilfield is built step by step based on the detailed core observation and employing core data, log data, geological data and seismic data. Firstly, the sedimentary facies model is built on the basis of analyzing seismic facies and electro-facies, and the models of reservoir matrix properties controlled by the sedimentary facies are then built based on structure analysis and methods optimization. Secondly, the fracture distribution model is established applying the results of the seismic property analysis and the core fracture description. Thirdly, the three-dimensional integrated geological model of the dual porosity reservoirs is set up by combining the matrix property models with the fracture distribution model and applying the filtration theory between matrix and fractures. The set of methods finally provides a fracture distribution model, a fracture equivalent permeability model and a dual porosity equivalent permeability model, which can be directly provided to reservoir engineers for numerical simulation.