A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil

Longhui Bai; Bo Liu; Xiaofei Fu; Qinhong Hu; Qiuli Huo; Liu Wang; Qiming Wang; Li Fu; Mehdi Ostadhassan

Geoscience Frontiers (Nov 2023)

A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil

Longhui Bai,
Bo Liu,
Xiaofei Fu,
Qinhong Hu,
Qiuli Huo,
Liu Wang,
Qiming Wang,
Li Fu,
Mehdi Ostadhassan

Affiliations

Longhui Bai: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China; Department of Earth and Environmental Sciences, The University of Texas at Arlington, TX 76019, USA
Bo Liu: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China; Corresponding author.
Xiaofei Fu: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
Qinhong Hu: Department of Earth and Environmental Sciences, The University of Texas at Arlington, TX 76019, USA; Shandong Provincial Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
Qiuli Huo: Research Institute of Exploration and Development of Daqing Oilfield Company Ltd., Daqing 163712, China
Liu Wang: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
Qiming Wang: Department of Earth and Environmental Sciences, The University of Texas at Arlington, TX 76019, USA; Shandong Provincial Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
Li Fu: Research Institute of Exploration and Development of Daqing Oilfield Company Ltd., Daqing 163712, China
Mehdi Ostadhassan: Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China

Journal volume & issue: Vol. 14, no. 6
p. 101684

Abstract

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An accurate evaluation of the shale oil mobility is crucial to its cost-effective exploitation. This study presents a method to assess shale oil mobility by integrating the pore structure and oil states distributions. First, a set of three discrete organic extracts (EOM-A, B and C) were obtained by sequential extraction. The relationships among the EOMs and the oil states were inferred from the group compositions and fluorescence properties of the produced shale oil (free state). The results showed that EOMs A and B represent free oil in the open and closed pores, respectively, while the EOM-C represents adsorbed oil. Then, NMR T1-T2 map is used to determine the T2-cutoff values that indicate the pore size ranges of different oil states. Free oil resides mainly in larger pore space (T2 > 0.5 ms), while the adsorbed oil in smaller pore space (0.2 ms 0.5 and T2-cutoff > 1.0 ms suggest that the free oil in connected pores has the highest mobility. This work can provide a reference for evaluating the shale oil potential and prospectivity in other regions.

Published in Geoscience Frontiers

ISSN: 1674-9871 (Print); 2588-9192 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Geology
Website: https://www.sciencedirect.com/journal/geoscience-frontiers

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