孔隙结构研究在低渗透储层有效性评价中的应用

Application of pore structure study in effectiveness evaluation of low permeability reservoir

耿 斌 胡心红

胜利油田分公司地质科学研究院，山东 东营 257015 胜利油田分公司物探研究院，山东 东营 257022

Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China Geophysical Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257022, China

低渗透储层由于物性差，孔喉细小，给储层有效性评价带来了很大困难，直接影响了储量评价的客观性。压汞实验提供的一系列孔隙结构参数，从不同方面反映了孔隙结构的有效性。利用实验提供的孔隙结构参数可以确定有效层的下限；利用核磁共振测井资料进行孔隙结构研究，能够由T2谱计算出连续的孔喉半径，对于提高有效层的客观性具有良好的帮助。以盐家油田低渗透砂砾岩油藏为例，通过对孔隙结构参数和渗透率的相关统计，并进行机理分析，确定出有效储层的下限；再通过核磁共振测井，计算出孔喉半径参数，直接应用于有效储层的划分，取得了良好的效果。

It is difficulty to evaluate the effectiveness of low permeability reservoir as the poor physical properties and small pore throat, which directly affects the objectivity of reserves evaluation. A series of experiments about pore structure provided by mercury penetration reflect the effectiveness of pore structure from different aspects, which can determine the low limit of effective reservoir according to the pore structure parameters. We can use NMR log data to study the pore structure, continuous pore throat radius can be calculated from the T2 spectrum, and it applies a good help to effectiveness evaluation of reservoir. Taking the low permeability glutenite reservoir of Yanjia Oilfield as an example, the low limit of effective reservoir is determined  by the relevant statistical parameters of pore structure and permeability and mechanism analysis. Good results have been obtained in the calculation of pore throat radius by NMR data and the effective division of reservoir by the direct application of calculated throat radius parameters.