摘要
应用CT扫描技术对岩心的孔隙结构进行了研究,根据灰度值范围的选取,得到了储层岩心的孔隙度;通过二维横截面图片,对岩心孔喉比进行了研究;并且明确了岩心配位数的查找方法,给出了岩样的配位数分布特点。研究结果表明,渗透率为370×10-3μm2的配位数主要在5～13之间,而且有50%以上的比例在7～9;而渗透率为554×10-3μm2的配位数在6～15之间,有60%以上的比例在10～13;CT扫描得出的孔喉比由几变化到几十,最大孔喉比可达60,而随着渗透率的增加,孔喉比在降低,这与恒速压汞实验得出的结论基本是一致的。
Through the CT scanning technique, the pore structures of the cores are studied. According to the selection of the grey value range, the porosity of the reservoir cores are obtained. Through the twodimensional cross-sectional images, the pore-throat ratio of the cores is studied; in addition, the search method of the coordination number is clear, and the distribution characteristics of the coordination number are given. The results of the study show that when the permeability is 370 × 10-3 μm2 , the coordination number is mainly in the range from 5 to 13, but more than 50% are in 7-9. When the permeability is 554×10 -3μm2, the coordination number is in the range from 6 to 15, but more than 60% are in 10-13. The pore-throat ratio gotten from the CT scanning ean be changed from a few to several decades, and the maximum can be 60. Along with the increase of permeability, the pore-throat ratio is reduced, this is in accordance with the result of constant speed and pressure mercury.
出处
《实验技术与管理》
CAS
北大核心
2013年第4期20-23,50,共5页
Experimental Technology and Management
基金
国家科技重大专项项目(20111zx05009)
黑龙江省高等教育教学改革项目(JG2012010098)
关键词
岩心
CT扫描技术
孔隙结构
配位数
core
CT Scanning technique
pore structure
coordination number
