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

Petroleum Science 2022年第3期19卷 1007-1018页

作者： Bo Liu Xiao-Wen Jiang Long-Hui Bai Rong-Sheng Lu Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast UniversityNanjingJiangsu 211189China State Key Laboratory Cultivation Base for Accumulation and Development of Unconventional oil and Gas Northeast Petroleum UniversityDaqingHeilongjiang 163318China School of Mechanical Engineering Southeast UniversityNanjingJiangsu 211189China State Key Laboratory of Bioelectronics Southeast UniversityNanjingJiangsu 211189China

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

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