利用斯通利波评价中孔低渗地层渗透率

摘要

The relationship between porosity and permeability is complex in the deep-water areas of Baiyun, with high porosity and high permeability, low porosity and low permeability, medium porosity and low perme-ability. Some reservoirs develop similar porosity, but very different permeability. Secondary pore development and cementation filling are the main factors controlling permeability through the core analysis, which is a chal-lenge for the conventional methods. Stoneley wave is sensitive to the pressure difference between the borehole fluid and the pore fluid. The amplitude attenuation and time delay of Stoneley wave can reflect the formation permeability. The method of using Stoneley wave to evaluate the permeability of the deep-water areas of Baiyun has achieved good results.%南中国海东部海域白云深水地区储层孔渗关系复杂,存在中高孔高渗、低孔低渗、中孔低渗等多种类型储层,出现储层间孔隙度相近、渗透率相差一到两个数量级的现象.岩心分析表明渗透率的主控因素是溶蚀孔隙发育和胶结物充填,给常规渗透率评价方法带来挑战.斯通利波对井中流体和孔隙流体之间的压力传递敏感,其幅度衰减和时间延迟可以反映储层流体的渗滤作用,能有效地进行地层渗透率的反演.利用斯通利波评价白云深水地区因孔喉连通性造成的渗透率差异问题,取得了良好的效果.