南海北部深水区烃源岩形成和分布研究
- 收稿日期:
1900-01-01
- 修回日期:
1900-01-01
- 刊出日期:
2011-10-10
摘要: 南海北部深水盆地与大西洋被动大陆边缘盆地烃源岩存在明显差异，大西洋被动大陆边缘盆地以中生界裂陷期湖相和坳陷期海相烃源岩为主，有机质主要来源于水生低等生物。南海北部深水区裂陷期可能发育第三系湖相烃源岩，但油气源分析结果表明，第三系海陆过渡相煤系烃源岩为本区主力烃源岩。南海北部深水区煤系烃源岩和海相烃源岩有机质主要来源于陆生高等植物，河流—三角洲体系是控制陆生高等植物生长和有机质富集的重要因素，海相烃源岩的有机质丰度存在由陆向海降低的趋势。南海北部深水区高有机质丰度烃源岩主要分布于盆地或凹陷周缘，以煤系烃源岩为主，部分为海相烃源岩，但盆地或凹陷沉积中心主要为有机质丰度相对较低的海相烃源岩，烃源岩条件较盆地或凹陷周缘地区差。
The Formation and Distribution of Source Rocks for Deep Water Area in the Northern of South China Sea
- Research Institute, CNOOC Beijing 100027;
- Received Date:
1900-01-01
- Rev Recd Date:
1900-01-01
- Publish Date:
2011-10-10
Abstract: Source rocks in deep water basins in the north of South China Sea are obviously different from the passive margin basins in Atlantic Ocean. Mesozoic lacustrine source rock in the rifting sequence and marine source rock in the postrift depression are the main source rocks in the passive margin basins of Atlantic Ocean, and their organic matters in lacustrine and marine source rocks all mainly came from aquatic lower organisms. There maybe exist three kinds of source rocks, including lacustrine source rock, transitional coalbearing source rock and marine source rock in deep water basins in the north of South China Sea, but the correlation of oil/gas and source showed that Tertiary coalbearing source rocks in transitional sequence is the main source rock there. Organic matters in transitional coalbearing source rock and marine source rock mainly came from terrestrial higher plants in the north of South China Sea, and fluvial deltaic system is one of the very important factors for controlling the growth of terrestrial higher plants and abundance of organic matter. Because of the influence of the Paleopearl River, coalbearing source rock of Enping Formation distribute relatively widespread and stable in the Pearl River Mouth basin. But there is no large river system, and fandelta is the main type of delta, so coalbearing source rock of Yacheng Formation distributed relatively limited in Qiongdongnan basin. The formation of marine source rocks is influenced by the quantity of terrestrial organic matter and accumulation and reservation of organic matter. Because of the difference of paleogeography condition between the Pearl River Mouth basin and Qiongdongnan basin, origin of terrestrial organic matter in the Pearl River Mouth basin is much more abundant than Qiongdongnan basin, and the content of total organic carbon for marine source rock in the Pearl River Mouth basin is higher than the same geological time source rocks in Qiongdongnan basin. Because the supply of terrestrial organic matter decrease from land to ocean, so the organic matter content of marine source rock also lower from land to ocean. Seen from the distribution of source rocks in north of South China Sea, source rocks with relative high organic matter content mainly distributed in the surrounding area of basin or depression, they are mainly composed of coalbearing source rock, also include some marine source rock with abundant organic matter, but the organic matter content is popularly low in the depocenter of basin or depression, the surrounding area of basin or depression is more profit for oil and gas exploration.
李友川. 南海北部深水区烃源岩形成和分布研究[J]. 沉积学报, 2011, 29(5): 970-979.
| 引用本文: |
李友川. 南海北部深水区烃源岩形成和分布研究[J]. 沉积学报, 2011, 29(5): 970-979.
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LI Youchuan. The Formation and Distribution of Source Rocks for Deep Water Area in the Northern of South China Sea[J]. Acta Sedimentologica Sinica, 2011, 29(5): 970-979.
| Citation: |
LI Youchuan. The Formation and Distribution of Source Rocks for Deep Water Area in the Northern of South China Sea[J]. Acta Sedimentologica Sinica, 2011, 29(5): 970-979.
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