Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin
In order to clarify the conditions and rules of hydrocarbon accumulation of the Upper Paleozoic in the Dongpu Sag of Bohai Bay Basin, source rock evaluation, pyrolysis experiment and basin modelling were carried out in this paper, the history of hydrocarbon generation and intensity of source rocks h...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Petroleum Geology and Experiment
2021-07-01
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| Series: | Shiyou shiyan dizhi |
| Subjects: | |
| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202104678 |
| _version_ | 1827329728763133952 |
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| author | Xuejun WANG Yongshui ZHOU Honglei LI Binfeng JIA Yingying ZHANG |
| author_facet | Xuejun WANG Yongshui ZHOU Honglei LI Binfeng JIA Yingying ZHANG |
| author_sort | Xuejun WANG |
| collection | DOAJ |
| description | In order to clarify the conditions and rules of hydrocarbon accumulation of the Upper Paleozoic in the Dongpu Sag of Bohai Bay Basin, source rock evaluation, pyrolysis experiment and basin modelling were carried out in this paper, the history of hydrocarbon generation and intensity of source rocks have been quantitatively studied, consequently, the significance of hydrocarbon accumulation in this area has also been discussed. The micro-composition of the Carboniferous-Permian source rocks in the Dongpu Sag is featured by high contents of hydrogen-rich exinite and matrix vitrinite (>10%), and the source rocks have a high oil-generating potential. The hydrocarbon generation process is characterized by multiple stages and wide gas generation band. During the Yanshanian period, the Carboniferous-Permian source rocks were shallowly buried, the Ro value ranged between 0.6%-0.8%, and only a little gas has been generated. In the Himalayan period, due to the differential thermal evolution of the Paleogene deposits, from the western part of the sag to the western slope, gas generation was significantly decreased, with an average of (1-20)×108 m3/km2. While in deep sag of the eastern part, source rocks were deeply buried with a high thermal degree, and a large amount of gas was generated with an intensity of (60-110)×108 m3/km2. Past exploration results have shown that the area with a gas generation intensity greater than 40×108 m3/km2 is favorable for natural gas accumulation. The gas generation intensity of the Qianliyuan sub-sag ranges (60-110)×108 m3/km2, which has favorable conditions for the formation of primary as well as paleogenetic and new-storage coal-derived gas reservoirs, and is a favorable exploration zone for the future exploration. |
| first_indexed | 2024-03-07T15:45:18Z |
| format | Article |
| id | doaj.art-3b47d5b8e00a4618af301fe7f96717b8 |
| institution | Directory Open Access Journal |
| issn | 1001-6112 |
| language | zho |
| last_indexed | 2024-03-07T15:45:18Z |
| publishDate | 2021-07-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
| record_format | Article |
| series | Shiyou shiyan dizhi |
| spelling | doaj.art-3b47d5b8e00a4618af301fe7f96717b82024-03-05T04:38:06ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122021-07-0143467868810.11781/sysydz202104678sysydz-43-4-678Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay BasinXuejun WANG0Yongshui ZHOU1Honglei LI2Binfeng JIA3Yingying ZHANG4Exploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457001, ChinaExploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457001, ChinaExploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457001, ChinaExploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457001, ChinaExploration and Development Research Institute, SINOPEC Zhongyuan Oilfield Branch Company, Puyang, Henan 457001, ChinaIn order to clarify the conditions and rules of hydrocarbon accumulation of the Upper Paleozoic in the Dongpu Sag of Bohai Bay Basin, source rock evaluation, pyrolysis experiment and basin modelling were carried out in this paper, the history of hydrocarbon generation and intensity of source rocks have been quantitatively studied, consequently, the significance of hydrocarbon accumulation in this area has also been discussed. The micro-composition of the Carboniferous-Permian source rocks in the Dongpu Sag is featured by high contents of hydrogen-rich exinite and matrix vitrinite (>10%), and the source rocks have a high oil-generating potential. The hydrocarbon generation process is characterized by multiple stages and wide gas generation band. During the Yanshanian period, the Carboniferous-Permian source rocks were shallowly buried, the Ro value ranged between 0.6%-0.8%, and only a little gas has been generated. In the Himalayan period, due to the differential thermal evolution of the Paleogene deposits, from the western part of the sag to the western slope, gas generation was significantly decreased, with an average of (1-20)×108 m3/km2. While in deep sag of the eastern part, source rocks were deeply buried with a high thermal degree, and a large amount of gas was generated with an intensity of (60-110)×108 m3/km2. Past exploration results have shown that the area with a gas generation intensity greater than 40×108 m3/km2 is favorable for natural gas accumulation. The gas generation intensity of the Qianliyuan sub-sag ranges (60-110)×108 m3/km2, which has favorable conditions for the formation of primary as well as paleogenetic and new-storage coal-derived gas reservoirs, and is a favorable exploration zone for the future exploration.https://www.sysydz.net/cn/article/doi/10.11781/sysydz202104678source rockhydrocarbon generation characteristicsgas generation intensitycarboniferous-permiandongpu sagbohai bay basin |
| spellingShingle | Xuejun WANG Yongshui ZHOU Honglei LI Binfeng JIA Yingying ZHANG Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin Shiyou shiyan dizhi source rock hydrocarbon generation characteristics gas generation intensity carboniferous-permian dongpu sag bohai bay basin |
| title | Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin |
| title_full | Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin |
| title_fullStr | Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin |
| title_full_unstemmed | Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin |
| title_short | Hydrocarbon generation characteristics and significance of accumulation of Upper Paleozoic source rocks in Dongpu Sag, Bohai Bay Basin |
| title_sort | hydrocarbon generation characteristics and significance of accumulation of upper paleozoic source rocks in dongpu sag bohai bay basin |
| topic | source rock hydrocarbon generation characteristics gas generation intensity carboniferous-permian dongpu sag bohai bay basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202104678 |
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