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南海深水某气田是由一系列线状的水道复合砂体组成,储层非均质性强,岩心孔隙度、渗透率关系比较分散,若给定岩石的任一孔隙度后,渗透率变化范围很大,孔隙度相近的不同地层,渗透率可以相差1～2个数量级,用传统的岩心样品孔隙度和渗透率建立关系式来估算储层渗透率很难得到理想的结果。采用取心井岩心,实验室分析孔隙度、渗透率、毛管压力等资料,采用聚类分析法和Winland孔喉半径(r35)分类法,将储层分为四级流动单元,将流动单元指数分类法推广到无取心井和储层段,计算出的储层渗透率与岩心分析比较接近,取得较满意的结果。同时,通过流动单元分类,搭建起储层岩性、物性与孔隙喉道半径之间的关系,为储层评价提供了一种途径,也在一定程度上提高了储层参数的解释精度。利用流动单元对储层进行分类评价,为地质建模提供了可靠的基础资料。
A gas field in the South China Sea deepwater consists of a series of linear waterway composite sand bodies. The reservoir heterogeneity is strong, and the porosity and permeability of the core are relatively dispersed. If any porosity of the rock is given, the permeability range Large, similar porosity of different strata, the permeability can be a difference of 1 to 2 orders of magnitude, the traditional core sample porosity and permeability to establish the relationship between reservoir permeability is difficult to obtain the desired results. The core of coring well, laboratory analysis of porosity, permeability, capillary pressure and other data, using cluster analysis and Winland throat radius (r35) classification, the reservoir is divided into four flow units, the flow unit index The taxonomy is extended to non-coring wells and reservoir sections. The calculated reservoir permeability is close to that of core analysis and satisfactory results are obtained. At the same time, the relationship between reservoir lithology, physical properties and pore throat radius is established through the classification of flow units, which provides a way for reservoir evaluation and also improves the interpretation accuracy of reservoir parameters to a certain extent. The use of flow units to classify the reservoir evaluation provides a reliable basis for geological modeling.