Investigation of oil and water migrations in lacustrine oil shales using 20 MHz 2D NMR relaxometry techniques  

作　　者：Bo Liu Xiao-Wen Jiang Long-Hui Bai Rong-Sheng Lu 

机构地区：[1]Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments,Southeast University,Nanjing,Jiangsu 211189,China [2]State Key Laboratory Cultivation Base for Accumulation and Development of Unconventional Oil and Gas,Northeast Petroleum University,Daqing,Heilongjiang 163318,China [3]School of Mechanical Engineering,Southeast University,Nanjing,Jiangsu 211189,China [4]State Key Laboratory of Bioelectronics,Southeast University,Nanjing,Jiangsu 211189,China

出　　处：《Petroleum Science》2022年第3期1007-1018,共12页石油科学（英文版）

基　　金：supported by the Opening Fund of Key Laboratory of Continental Shale Accumulation and Development(Northeast Petroleum University,China);the National Natural Science Foundation of China(Grant No.51605089,Grant No.41972156)

摘　　要：The behavior of oil and water in tight rocks can change the distribution of oil or water in pores,which affects the production of crude oil.Nuclear Magnetic Resonance(NMR)method is an effective and nondestructive tool for evaluating rocks with comparison and analysis both quantitatively and qualitatively.In our study,20 MHz NMR Relaxometry is used as a key technique to study the changes of water and oil behaviors in Chinese lacustrine Qingshankou shales under different saturated states(imbibition and evaporation without pressure).The results show that variation in different proton populations(water,oil and organic)can be distinguished using 2D T_(1)-T_(2)maps.The comparison among T_(1)-T_(2)maps with different saturated states shows that different signal regions changed during oil and water migrations,which the 1D NMR Relaxometry may be not easy to approach.Combined with the pyrolysis analysis,T2 shift and differences of signal regions in T_(1)-T_(2)maps can reflect properties such as wettability and composition(organic matter,clay and magnetic minerals)to some extent.This study provides better insight into oil and water behaviors in lacustrine oil shales with further understanding of 20 MHz NMR 2D T_(1)-T_(2)maps both in qualitative and quantitative analysis.

关 键 词：NMR Relaxometry Lacustrine oil shales Oil and water migrations T_(1)-T_(2)map 

分 类 号：P618.13[天文地球—矿床学]