Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China
The spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation, occurrence, and prospectivity of tight oil and gas reservoirs. In this study, we analyze the fundamental oil and gas accumulation processes occurring in the Songliao Basi...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-05-01
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| Series: | International Journal of Mining Science and Technology |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268617307930 |
| _version_ | 1818489213938565120 |
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| author | Laixing Cai Guolin Xiao Shuangfang Lu Jiao Wang Zhiqiang Wu |
| author_facet | Laixing Cai Guolin Xiao Shuangfang Lu Jiao Wang Zhiqiang Wu |
| author_sort | Laixing Cai |
| collection | DOAJ |
| description | The spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation, occurrence, and prospectivity of tight oil and gas reservoirs. In this study, we analyze the fundamental oil and gas accumulation processes occurring in the Songliao Basin, contrasting tight oil sand reservoirs in the south with tight gas sand reservoirs in the north. This is done using geochemical data, constant-rate and conventional mercury injection experiments, and fluid inclusion analyses. Our results demonstrate that as far as fluid mobility is concerned, the expulsion center coincides with the overpressure zone, and its boundary limits the occurrence of tight oil and gas accumulations. In addition, the lower permeability limit of high-quality reservoirs, controlled by pore-throat structures, is 0.1 × 10−3 μm2 in the fourth member of the Lower Cretaceous Quantou Formation (K1q4) in the southern Songliao Basin, and 0.05 × 10−3 μm2 in the Lower Cretaceous Shahezi Formation (K1sh) in the northern Songliao Basin. Furthermore, the results indicate that the formation of tight oil and gas reservoirs requires the densification of reservoirs prior to the main phase of hydrocarbon expulsion from the source rocks. Reservoir “sweet spots” develop at the intersection of high-quality source rocks (with high pore pressure) and reservoirs (with high permeability). Keywords: Spatial-temporal coupling, High-quality source rock, High-quality sandstone, Tight sandstone reservoir, Songliao Basin |
| first_indexed | 2024-12-10T17:01:24Z |
| format | Article |
| id | doaj.art-5a71fd26342f41ffbb00b2594f297640 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-10T17:01:24Z |
| publishDate | 2019-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-5a71fd26342f41ffbb00b2594f2976402022-12-22T01:40:34ZengElsevierInternational Journal of Mining Science and Technology2095-26862019-05-01293387397Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, ChinaLaixing Cai0Guolin Xiao1Shuangfang Lu2Jiao Wang3Zhiqiang Wu4Qingdao Institute of Marine Geology, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, ChinaQingdao Institute of Marine Geology, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, ChinaResearch Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum (East China), Qingdao 266580, China; Corresponding author.Qingdao Institute of Marine Geology, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, ChinaQingdao Institute of Marine Geology, Qingdao 266071, China; Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, ChinaThe spatial-temporal relationship between high-quality source rocks and reservoirs is a key factor when evaluating the formation, occurrence, and prospectivity of tight oil and gas reservoirs. In this study, we analyze the fundamental oil and gas accumulation processes occurring in the Songliao Basin, contrasting tight oil sand reservoirs in the south with tight gas sand reservoirs in the north. This is done using geochemical data, constant-rate and conventional mercury injection experiments, and fluid inclusion analyses. Our results demonstrate that as far as fluid mobility is concerned, the expulsion center coincides with the overpressure zone, and its boundary limits the occurrence of tight oil and gas accumulations. In addition, the lower permeability limit of high-quality reservoirs, controlled by pore-throat structures, is 0.1 × 10−3 μm2 in the fourth member of the Lower Cretaceous Quantou Formation (K1q4) in the southern Songliao Basin, and 0.05 × 10−3 μm2 in the Lower Cretaceous Shahezi Formation (K1sh) in the northern Songliao Basin. Furthermore, the results indicate that the formation of tight oil and gas reservoirs requires the densification of reservoirs prior to the main phase of hydrocarbon expulsion from the source rocks. Reservoir “sweet spots” develop at the intersection of high-quality source rocks (with high pore pressure) and reservoirs (with high permeability). Keywords: Spatial-temporal coupling, High-quality source rock, High-quality sandstone, Tight sandstone reservoir, Songliao Basinhttp://www.sciencedirect.com/science/article/pii/S2095268617307930 |
| spellingShingle | Laixing Cai Guolin Xiao Shuangfang Lu Jiao Wang Zhiqiang Wu Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China International Journal of Mining Science and Technology |
| title | Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China |
| title_full | Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China |
| title_fullStr | Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China |
| title_full_unstemmed | Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China |
| title_short | Spatial-temporal coupling between high-quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the Songliao Basin, China |
| title_sort | spatial temporal coupling between high quality source rocks and reservoirs for tight sandstone oil and gas accumulations in the songliao basin china |
| url | http://www.sciencedirect.com/science/article/pii/S2095268617307930 |
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