Diapir Structure and Its Origin in the Baiyun Depression, Pearl River Mouth Basin, China
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摘要: 珠江口盆地位于中国南海北部, 是中国近海含油气盆地中一个重要的盆地.盆地内发育众多形态各异的底辟构造, 目前仅有少量的文章对其进行过分类研究, 缺少系统地论述.底辟构造是流体穿层流动的一种特殊形式, 对其展开分类及成因分析有助于洞察白云凹陷内流体的活动信息和油气运移特征.本文针对珠江口盆地白云凹陷地震剖面上所显示的大量而且种类丰富的底辟构造, 开展了底辟构造识别、分类及其内涵流体活动信息的研究, 依据盆地模拟结果和区域构造特征讨论了底辟构造的成因特征, 得出如下两个结论: (1) 珠江口盆地发育多种类型的底辟构造, 有底辟初期的龟背上拱、泥底辟、气体泄流通道、裂缝带这4种类型, 不同的底辟构造类型内涵有不同的地质信息; (2) 底辟构造的成因与构造活动密切相关, 超压对底辟构造的形成与活动影响较小, 不起主要的作用.Abstract: As one of the most important offshore basins in China, there exist many different kinds of fluid diapirs in the Pearl River Mouth basin, which have been introduced in some papers.However, the systemic study of these diapirs is still to be expected on its classification and origin, which can understand fluid migration better.Fluid diapir structure is a special style of fluid migrating upwards.The aim of this paper is to identify and classify the fluid diapir structure, to analyze the messages implied by the fluid diapir structure, to find out a new method of evaluating the fluid diapir structure characterized by the blank seismic reflection, and to discuss the origin of the diapirs according to basin modeling and structure analysis.On the basis of the investigation, we can come to the following conclusions: (1) There are four kinds of diapirs in the Pearl River Mouth basin including the turtleback-like arch, mud diapir, gas seepage, fault (or crack), which indicate different geological messages; (2) Structure activity rather than the overpressure is the primary driving pressure on diapirs.
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Key words:
- diapir /
- basin modeling /
- diapir origin /
- Baiyun depression /
- Pearl River Mouth basin
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图 1 珠江口盆地构造单元(据代一丁和庞雄(1999)修改)
Fig. 1. Structural units and study area in the Pearl River Mouth basin
图 2 珠江口盆地地层综合柱状图(据陈长民等(2003)修改)
Fig. 2. Generalised stratigraphic column of the Pearl River Mouth basin
图 3 塑性变形层中的断层与龟背上拱
Fig. 3. Turtleback-like arches and associated faults in the plastic deformation stratigraphy
图 9 白云凹陷文昌组沉积相与断层叠合
Fig. 9. Depositional facies and faults in Wenchang Formation, Baiyun depression
图 7 珠江口盆地番禺低隆起地层压力、压力系数和地层温度随深度分布图(据11口钻井测试资料)
Fig. 7. Plots of formation pressure, coefficient of pressure and formation temperature vs. depth in Panyu low uplift, the Pearl River Mouth basin
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Chen, C.M., Shi, H.S., Xu, S.C., et al. 2003. Formation conditions of Tertiary oil & gas reservoirin Pearl River Mouth basin China. Science Press, Beijing (in Chinese). Dong, W. L., Huang, B. J. . 2000. Overpressured fluid fractuaring, heat fluid flowing and episodic gas migration in the diapir belt, Yinggehai basin. Petroleum Exploration and Development, 27 (4): 36-40 (in Chinese with English abstract). Dai, Y. D., Pang, X. . 1999. Petroleum geological characteristics of ZhuⅡdepression, Pearl River Mouth basin, China. China Offshore Oil and Gas (Geology), 13 (3): 169-173 (in Chinese with English abstract). He, J. X., Huang, H. Y., Chen, L. C. . 1994. The formation and evolution of mud diapir andits relationship with hydrocarbon accumulation mechanismin Yinggehai basin. Acta Sedimentologica Sinica, 12 (3): 120-129 (in Chi-nese with English abstract). Lüdmann, T., Wong, H. K. . 2003. Characteristics of gas hydrate occurrences associated with mud diapirismand gas escape structures in the northwestern sea of Okhotsk. Marine Geology, 201: 269-286. doi: 10.1016/S0025-3227(03)00224-X Pang, X., Yang, S. K., Zhu, M., et al. 2004. Deep-water fan systems and petroleumresources on the northern slope of the South China Sea. Acta Geological Sinica, 78 (3): 626-631. Peng, D. J., Pang, X., Chen, C. M., et al. 2005. From shallow-water shelf to deep-water slope—The study on deep-water fan systems in South China Sea. Acta Sedmentologica Sinica, 23 (3): 1-11 (in Chinese with English abstract). Shi, W. Z., Chen, H. H., Chen, C. M., et al. 2006. Modelling of pressure evolution and hydrocarbon migration in the Baiyun depression, Pearl River Mouth basin, China. Earth Science—Journal of China University of Geosciences, 31 (2): 229-236 (in Chinese with English abstract). Wang, J. H., Pang, X., Wang, C. W., et al. 2006. Discovery and recognition of the central diapiric zonein Baiyun depression, Pearl River Mouth basin. Earth Science—Journal of China University of Geosciences, 31 (2): 209-213 (in Chinese with English abstract). Xie, X. N., Li, S. T., Hu, X. Y., et al. 1999. Fluid migration system and its origin in diapir belt, Yinggehai basin, China. Science in China (Ser.D), 29 (3): 247-256 (inChinese). 陈长民, 史和生, 许仕策, 等. 2003. 珠江口盆地(东部) 第三系油气藏形成条件. 北京: 科学出版社. 董伟良, 黄保家. 2000. 莺歌海盆地流体压裂与热流体活动及天然气的幕式运移. 石油勘探与开发, 27 (4): 36-40. doi: 10.3321/j.issn:1000-0747.2000.04.008 代一丁, 庞雄. 1999. 珠江口盆地珠二坳陷石油地质特征. 中国海上油气(地质), 13 (3): 169-173. https://www.cnki.com.cn/Article/CJFDTOTAL-ZHSD199903003.htm 何家雄, 黄火尧, 陈龙超. 1994. 莺歌海盆地泥底辟发育演化与油气运聚机制. 沉积学报, 12 (3): 120-129. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB403.014.htm 彭大钧, 庞雄, 陈长民, 等. 2005. 从浅水陆架走向深水陆坡——南海深水扇系统的研究. 沉积学报, 23 (1): 1-11. doi: 10.3969/j.issn.1000-0550.2005.01.001 石万忠, 陈红汉, 陈长民, 等. 2006. 珠江口盆地白云凹陷地层压力演化与油气运移模拟. 地球科学——中国地质大学学报, 31 (2): 229-236. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200602012.htm 王家豪, 庞雄, 王存武, 等. 2006. 珠江口盆地白云凹陷中央底辟带的发现及识别. 地球科学——中国地质大学学报, 31 (2): 209-213. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200602009.htm 解习农, 李思田, 胡祥云, 等. 1999. 莺歌海盆地底辟带热流体输导系统及其成因机制. 中国科学(D辑), 29 (3): 247-256. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK199903006.htm -
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