利用峰点孔喉半径确定储层物性下限值

Reservoir Physical Cutoffs Determination by Using Peak Radius of Pore Throat

储层物性中孔隙度、渗透率下限值受海上油田施工等因素的限制,难以获取大量的测试、取样等基础资料。在缺少测试、取样资料或者纵向上地层原油黏度差异较大的情况下确定合理的储层物性下限值是一个急需解决的难题。利用峰点孔喉半径,采用岩心压汞分析数据结合岩心孔隙度—渗透率关系确定储层物性下限值的方法,对渤海10个测试、取样资料丰富的油田的共435块岩心压汞数据进行了分析,发现峰点孔喉半径界限值与地层原油黏度具有较好的相关性。在缺少测试资料的情况下可以通过地层原油黏度得到峰点孔喉半径界限值,结合改进的Winland方程可确定储层物性下限值。

Reservoir physical cutoffs are the key parameters for reserves evaluation,but it is hard to get enough testing or sampling data due to limitation of offshore operation,or great oil viscosity difference in longitudinal formation with less testings.We resolve the problem by integrating injected mercury core data and core porosity and permeability data based on peak radius of pore throat.This method is used for 435 mercury core data analyses in Bohai Oilfield,which indicates that the peak radius cutoff of pore throats has good correlation with the crude oil viscosity.With a combination of the improved Winland equation,the method is proved to be reasonable and reliable in physical cutoffs determination of Bohai oil wells.