矩法在研究低渗透储层孔隙结构中的应用及软件开发

对确定储集层孔隙结构特征参数的两种常用方法进行了分析讨论。结果表明：对于一些具有较大孔隙度、渗透率,原始粒间孔隙遭到破坏不严重的中、高渗透砂岩储层,大多数孔隙喉造大小遵从正态分布,利用正态分布法确定岩石孔隙结构特征参数是适用的。而对于低渗透储层,其孔喉分布通常受成岩及后生作用过程中几种成因的综合影响。矩法考虑了储层岩石的成岩作用及后生作用等因素对储层岩石孔隙结构的影响。因此,利用矩法确定低渗透储层的孔隙结构特征参数比正态概率法更为合理。通过东濮凹陷桥口地区Es3^3段孔隙结构特征参数计算的实例说明该方法的应用,并根据矩法的原理,使用Matlab5.3开发出运行于Windows下的压汞数据处理系统YGPS。

APPLICATION OF RECTANGULAR METHOD TO THE RESEARCH ON PORE MICROGEOMETRY OF LOW PERMEABILITY RESERVOIRS AND SOFTWARE DEVELOPMENT

This paper make analysis and discussion on the methods to determine pore microgeometrical parameters of reservoirs. The result shows that for middle high permeable sandstone reservoirs with high porosity, permeability and in which original pores are not seriously destroyed, the sizes of most pore throats submit to normal distribution. It is suitable to determine pore microgeometrical parameters by means of the normal distribution method. But for reservoirs with low permeability, their porosity and permeability are influenced by lithification and catagenesis. The rectangular method takes into consideration these effects and is more reasonable than the normal distribution method. In the end of the paper, an example of Qiaokou, Dongpu depression Es3 4 member is given to illustrate the application of the rectangular method. According to the rectangular method, a Hg injection data processing system named YGPS has been developed using Matlab5.3. It can be run under Windows system.