摘要
为了探究致密储层的孔隙结构特征,首先,应用分形理论,对新立油田扶杨油层的致密砂岩的孔隙结构进行了核磁共振和压汞法表征,表征结果显示核磁共振T2与孔隙大小的关系更符合幂函数关系,而不是线性关系;然后,利用核磁共振T2谱计算了微孔、中孔和大孔的分形维数;最后,分析了由核磁共振T2谱计算得到的不同孔径分形维数与致密油砂岩岩石物理性质的关系。分析结果表明:中孔对岩石物理性质的影响最大,随着中孔和大孔分形维数的增加,岩心样品孔喉尺寸呈指数下降,渗透率、孔隙度和RQI显著下降,岩石物性变差。
To study the pore structure characteristics of compact formation, the pore structure of compact sandstone in Fuyang reservoir oil layer of Xinli oilfield was characterized by NMR and mercury injection using fractal theory. The relationship between NMR T2 and pore size is more power function than linear relationship. Fractal dimensions of micropore, mesopore and macropore were calculated by using nuclear magnetic resonance T2 spectroscopy. Finally, the relationship between the fractal dimension of different pore diameters calculated by nuclear magnetic resonance T2 spectrum and the physical properties of tight oil sandstone is analyzed. The results shows that mesopore has the greatest influence on rock physical properties. With the increase of fractal dimension of mesopore and macropore, pore throat size of core samples decreases exponentially, permeability, porosity and RQI decrease significantly, and rock physical properties deteriorate.
作者
沈畅
欧阳传湘
阮迪
吴琼
SHEN Chang;OUYANG Chuanxiang;RUAN Di;WU Qiong(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Jilin Xinli Oilfield Production Plant,Songyuan,Jilin 131109,China)
出处
《中国科技论文》
CAS
北大核心
2019年第12期1334-1340,共7页
China Sciencepaper
基金
中国石油科技创新基金资助项目(2017D-5007-0311)
国家自然科学基金资助项目(51404037)
关键词
核磁共振
压汞法
致密油
砂岩
孔隙结构
分形维数
nuclear magnetic resonance(NMR)
mercury intrusion porosimetry(MIP)
tight oil
sandstone
pore structure
fractal dimension
