致密油储层大孔区间孔隙度计算渗透率方法

松辽盆地长垣南地区扶余致密油储层已经成为大庆油田持续稳产较为现实的勘探突破目标。 渗透率作为判断致密油“甜点”的重要参数，其准确计算已成为致密油“七性”（岩性、物性、含油性、电性、脆性、烃源岩特性和地应力各向异性）参数评价和勘探开发部署的关键技术。 通过分析几种常用的测井计算渗透率方法在致密油储层中的不适用性，应用压汞和核磁共振实验资料，明确了不同大小孔径分布与渗透率的关系，利用大孔区间孔隙度对储层渗透率贡献较大的特点，形成了一种应用大孔区间孔隙度计算渗透率的方法，提高了致密油储层测井计算渗透率的精度，为致密油藏的准确评价奠定了基础。

Calculation method of permeability for big pore interval porosity of tight oil reservoir

The tight oil reservoir of Fuyu layer in the southern placanticline of Songliao Basin has become more practical exploration breakthrough objective for the sustained and stable yields of Daqing Oilfield. Permeability is an important parameter for evaluating the“sweet spots” of tight oil, and the accurate calculation of permeability is a key technology for parameter evaluation of “seven properties”（lithologies, physical properties, oiliness, electric properties, brittleness, source rock features and ground stress anisotropy） and the deployment and implementation of tight oil exploration and development. Based on the analysis of the inapplicability of several commonly used methods of calculating permeability by logging for tight oil reservoir, combined with experimental data from NMR and mercury intrusion, this paper determined the relationship between different pore size distribution and permeability. Accorded to the largest contribution characteristic of the big pore interval porosity to reservoir permeability, a method of using the big pore interval porosity for calculating permeability was formed. This method improved the calculation precision of logging permeability in tight oil reservoir, and provided a basis for accurate evaluation of tight oil reservoir.