基于岩石物理相的储层渗透率解释模型研究

On the Permeability Models Based on the Petrophysical Facies

陆相储集层非均质性严重 ,不同层位的物性变化规律不同 ,如果在一个区块采用同一渗透率解释模型 ,势必造成较大的误差。为此 ,提出了一种基于岩石物理相的储层渗透率解释方法。储层岩石物理相是沉积作用、成岩作用、后期构造作用和流体改造作用的综合反映 ,同一岩性相可对应于不同的岩石物理相 ,而同一种岩石物理相则具有相似的水力学特征和相似的物性特征。根据流动层带指标 ,将辽河油田沈 84块砂岩储层定量划分为 4类岩石物理相 ,每一类岩石物理相代表着不同的岩性和物性 ,在表征各类岩石物理相的基础上 ,建立了各类岩石物理相的渗透率解释模型。该模型改善了储层渗透率的预测精度 ,且反映了储层沉积特征和非均质性 ,为油田高含水期精细油藏描述提供了可靠的渗透率参数。

On the Permeability Models Based on the Petrophysical Facies. WLT, 2001, 25(4): 287-290 Continental reservoir rocks are normally of serious heterogeneity with different permeability in different block areas or horizons. They are hardly described with the same permeability model in the same block. This paper presents a new permeability model based on reservoir petrophysical facies. The reservoir petrophysical facies is considered as the complex reflection of sedimentation, diagenesis, late construction and fluid reworking. The one rock facies should be corresponding to different petrophysical facies. However, the hydraulic and physical property are similar in one petrophysical facies unit. Based on the parameter of flow zone indicator, the Shen 84 block sandstone reservoir petrophysical facies was divided into 4 types in Liaohe Oilfield, each represents a different lithologic and physical property. The paper describes the well log interpretation models with different permeabilities in different types of petrophysical facies, which can give higher accuracy of permeability parameter, reflect sedimentary characteristics and heterogeneity in detail, and provide reliable related permeability parameters for fine reservoir description in the high water cut stage.