A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil
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...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987123001512 |
| _version_ | 1797659937589952512 |
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| author | Longhui Bai Bo Liu Xiaofei Fu Qinhong Hu Qiuli Huo Liu Wang Qiming Wang Li Fu Mehdi Ostadhassan |
| author_facet | Longhui Bai Bo Liu Xiaofei Fu Qinhong Hu Qiuli Huo Liu Wang Qiming Wang Li Fu Mehdi Ostadhassan |
| author_sort | Longhui Bai |
| collection | DOAJ |
| description | 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 < T2 < 0.5 ms). Finally, the ratio of free to adsorbed oil (F/A) > 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. |
| first_indexed | 2024-03-11T18:22:32Z |
| format | Article |
| id | doaj.art-c914facf9d3e4d3a9486bcde04456e79 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-11T18:22:32Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-c914facf9d3e4d3a9486bcde04456e792023-10-15T04:37:22ZengElsevierGeoscience Frontiers1674-98712023-11-01146101684A new method for evaluating the oil mobility based on the relationship between pore structure and state of oilLonghui Bai0Bo Liu1Xiaofei Fu2Qinhong Hu3Qiuli Huo4Liu Wang5Qiming Wang6Li Fu7Mehdi Ostadhassan8Key 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, USAKey Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China; Corresponding author.Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, ChinaDepartment 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, ChinaResearch Institute of Exploration and Development of Daqing Oilfield Company Ltd., Daqing 163712, ChinaKey Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, ChinaDepartment 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, ChinaResearch Institute of Exploration and Development of Daqing Oilfield Company Ltd., Daqing 163712, ChinaKey Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, ChinaAn 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 < T2 < 0.5 ms). Finally, the ratio of free to adsorbed oil (F/A) > 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.http://www.sciencedirect.com/science/article/pii/S1674987123001512Qingshankou FormationSequential extractionNMR T1-T2Free and adsorbed oilShale oil mobility |
| spellingShingle | Longhui Bai Bo Liu Xiaofei Fu Qinhong Hu Qiuli Huo Liu Wang Qiming Wang Li Fu Mehdi Ostadhassan A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil Geoscience Frontiers Qingshankou Formation Sequential extraction NMR T1-T2 Free and adsorbed oil Shale oil mobility |
| title | A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| title_full | A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| title_fullStr | A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| title_full_unstemmed | A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| title_short | A new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| title_sort | new method for evaluating the oil mobility based on the relationship between pore structure and state of oil |
| topic | Qingshankou Formation Sequential extraction NMR T1-T2 Free and adsorbed oil Shale oil mobility |
| url | http://www.sciencedirect.com/science/article/pii/S1674987123001512 |
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