Tectonic Dynamics of Cenozoic Sedimentary Basins and Hydrocarbon Resources in the South China Sea
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摘要: 通过对构造环境、地球物理场特征、盆地生储盖层发育等方面对比研究, 讨论南海南北部沉积盆地的油气资源分布特征, 为在南海进行油气勘查指明方向.目前油气勘探实践证明, 南海南部的油气资源比北部丰富, 究其原因, 南海北部为被动大陆边缘, 张性沉积盆地的烃源岩体积较小, 而南部挤压环境下形成的沉积盆地的烃源岩体积大; 北部的地热流较南部小, 因此地温梯度也较小, 如北部陆架上的珠江口盆地的热流值在5 3~ 87mW /m2之间, 平均6 7mW /m2, 而南海南部大曾母盆地平均热流值达97mW /m2, 最大值达130mW /m2, 故南部边缘烃源岩的成熟度比北部高; 由于南部边缘处于挤压构造环境, 因此在沉积盆地中形成了许多挤压构造, 而北部边缘一直处于张性构造环境, 形成的构造较少且较小; 同时, 南部边缘沉积盆地中, 烃源岩生烃与构造形成在时间上搭配较好.因此, 在南海南部边缘沉积盆地中形成了许多大型油气田, 而南海北部边缘沉积盆地中, 大型油气田较少, 中小型油气田较多.这就是为什么南海南部边缘的油气资源比北部丰富的地质原因.Abstract: This paper discusses the distributing characteristics of petroleum in the South China Sea by comparing on the tectonic environments, the assemble of reservoirs, source and cap rocks between the southern and northern South China Sea in order to demonstrate the exploration guide of the petroleum. Petroleum potential in the southern margin of the South China Sea is better than that in the northern margin according to present petroleum exploration. Possible reasons causing such a difference may be grouped into the following aspects. Firstly, the southern South China margin belongs to an extruding environment in Cenozoic time, where the volume of source rocks is bigger than that in the northern margin belonging to a passive environment. Secondly, heat flow and geothermal gradient in the southern margin are higher than those in the northern margin, for example, heat flow in the Pearl River Mouth basin on the shelf of northern margin is 53-87 mW/m2 with an average value of 67 mW/m2; but in the Zengmu basin in the southern margin, an average heat flow is 97 mW/m2 with a maximum value of 130 mW/m2. This fact indicates that the maturation of source rocks in the southern margin is higher than that in the northern margin. Thirdly, many large scale oil-bearing structures in the southern margin are formed due to the extruding environments in Cenozoic time, but trap structures in the northern margin are relatively little in quantity and small in scale in extension environments. Finally, the coordination between the formation time of trap structures and hydrocarbon-generating time in the southern margin is also better than that in the northern margin. Present hydrocarbon exploration also shows that a number of big oil and gas fields exist in the southern margin, only medium-little oil and gas fields occur in the northern margin. Therefore, petroleum potential in the southern margin is richer than that in the northern margin of the South China Sea.
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Feng, Z.Q., Miao, W.C., 1988. The geological structure and oil and gas potential in the Pear River Mouth basin. Geological Research of South China Sea, (1): 74-80(in Chinese with English abstract). Gong, Z.S., Li, S.T., Xie, T.J., 1997. Continental margin basins analysis and hydrocarbon accumulation of the northern South China Sea. Science Press, Beijing(in Chinese). He, L.S., 1988. Polycylic plate tectonic movements and the Cenozoic tectonics of the South China Sea. Geological Research of South China Sea, (1): 98-108(in Chinese with English abstract). Jin, Q.H., 1989. The geology and petroleum resources in the South China Sea. Geological Publishing House, Beijing(in Chinese). Kou, C.X., 1988. The Pre-Oligocene in Pear River Mouth basin: A new oil prospect in the northern South China Sea. Geological Research of South China Sea, (1): 90-97(in Chinese with English abstract). Liu, Z. H., Yao, B. C., Wang, L. L., et al., 2000. The petroleum geology and petroleum bearing system in the Beikang basin of the South China Sea. In: The proceedings of 1996-2000 national scientific researches on key problems. Geological Publishing House, Beijing, 553-556(in Chinese). Maruyama, S., 1994. Plume tectonics. Jour. Geol. Soc. Japan, 100(1): 24-49. Wang, G.Y., Yao, B.C., Miao, W.C., 1998. A preliminary study on the southern Taiwan-Soal basin and its prospects of hydrocarbon resources. Geological Research of South China Sea, (1): 66-73(in Chinese with English abstract). Wang, J.Y., 1996. Geothermics in China. Seismological Press, Beijing. Wu, J.M., 1991. The characteristics of tectonic geology and petroleum resources in the Nansha area of the South China Sea. Geological Research of South China Sea, 9: 24-38 (in Chinese with English abstract). Yao, B.C., 1993. Probing into Cenozoic tectonic movements of the continental margin in northern South China Sea. Geological Research of South China Sea, (5): 1-12(in Chinese with English abstract). Yao, B.C., 1996. Tectonic characterstics and evolution of the Nansha trough. Geological Research of South China Sea, (8): 1-14(in Chinese with English abstract). Yao, B.C., 1997. The re-exploration on the tectonic history of Wan'an basin in Nansha area of the South China Sea. Geological Research of South China Sea, (9): 25-41(in Chinese with English abstract). Yao, B.C., 1998. The tectonic evolution and sedimentary basins of South China Sea in Cenozoic. Geological Research of South China Sea, (10): 1-17(in Chinese with English abstract). Yao, B.C., Liu, Z.H., 2002. Distribution of petroleum resources and deep dynamics on the southern margin of the South China Sea. Academic papers of the 80th anniversary of the geological society of China. Geological Publishing House, Beijing, 409-420(in Chinese). 冯志强, 缪宛岑, 1988. 南海珠江口盆地地质构造特征和含油气远景. 南海地质研究, (1): 74-80. https://www.cnki.com.cn/Article/CJFDTOTAL-SYSD198201003.htm 龚再升, 李思田, 谢泰俊, 1997. 南海北部大陆边缘盆地分析与油气聚集. 北京: 科学出版社. 何廉声, 1988. 多旋回板块构造运动与南海新生代构造. 南海地质研究, (1): 98-108. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXB198402006.htm 金庆焕, 1989. 南海地质与油气资源. 北京: 地质出版社. 寇才修, 1988. 南海北部珠江口盆地前渐新世找油的新领域. 南海地质研究, (1): 90-97. https://www.cnki.com.cn/Article/CJFDTOTAL-HYDZ198402014.htm 刘振湖, 姚伯初, 王嘹亮, 等, 2000. 南海北康盆地油气地质与含油气系统. "九五国家重大科研成果学术讨论会"论文. 北京: 地质出版社, 553-556. 王光宇, 姚伯初, 缪宛岑, 1998. 台湾浅滩南盆地的初探及油气远景展望. 南海地质研究, (1): 66-73. 吴进民, 1991. 南沙群岛地质构造特征与油气远景. 南海地质研究, (9): 24-38. 姚伯初, 1993. 南海北部陆缘新生代构造运动初探. 南海地质研究, (5): 1-12. https://www.cnki.com.cn/Article/CJFDTOTAL-ZHSD199201004.htm 姚伯初, 1996. 南沙海槽的构造特征及其构造演化史. 南海地质研究, (8): 1-14. https://www.cnki.com.cn/Article/CJFDTOTAL-NHDZ199600000.htm 姚伯初, 1997. 南沙群岛万安盆地构造演化史再探. 南海地质研究, (9): 25-41. https://www.cnki.com.cn/Article/CJFDTOTAL-RDHY199703002.htm 姚伯初, 1998. 南海新生代的构造演化与沉积盆地. 南海地质研究, (10): 1-17. https://www.cnki.com.cn/Article/CJFDTOTAL-NHDZ199800000.htm 姚伯初, 刘振湖, 2002. 中国南海南沙海域油气资源分布和深部动力学特征. 中国地质学会80周年学术论文集. 北京: 地质出版社, 409-420. -
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