Quantitative evaluation of pore connectivity with nuclear magnetic resonance and high pressure mercury injection: A case study of the lower section of Es3 in Zhanhua sag
NING Chuanxiang
JIANG Zhenxue
GAO Zhiye
LI Zheng
ZHU Rifang
SU Siyuan
LI Tingwei
WANG Zhi
HUANG Ruizhe
CHEN Lei
Abstract：Quantitative evaluation of pore connectivity is essential to tight reservoirs effectiveness assessment.To calculate pore connectivity of tight reservoirs,after thorough analysis of the pore space deference reflected by nuclear magnetic resonance (NMR) and high pressure mercury injection (MICP),a calculation method using NMR and MICP was proposed and verified by spontaneous imbibition.The lower section of Es3 in Zhanhua sag was chosen for case study,and the results indicate that the pore distribution can be divided into 3 sections.Pores of 0-50 nm,whose average volume takes up 66.2％ of the total,are the most significant reservoir space.Pores of 50 nm-2 μm and more than 2μm,with average percentage of 16.6％ and 17.2％,are also important for storage and migration.Pore connectivity is controlled by the pore size and lamina development.Bigger pores have higher probability to access the migration channel,which leads to better pore connectivity.The lamina development not only increases the large pores volume,but improves the connectivity across different sizes of pores.
Keywords：nuclear magnetic resonancehigh pressure mercury injectionpore size distributionpore connectivitythird member of Shahejie formation (Es3)
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 578-585 )