| 张性边缘海的成因演化特征及沉积充填模式——以珠江口盆地为例 |
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| 引用本文： | 张志杰,于兴河,侯国伟,陈瑞.张性边缘海的成因演化特征及沉积充填模式——以珠江口盆地为例[J].现代地质,2004,18(3):284-289. |
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| 作者姓名： | 张志杰 于兴河 侯国伟 陈瑞 |
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| 作者单位： | 中国地质大学,能源地质系,北京,100083 |
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| 基金项目： | 科技部"九七三"项目(G2000046705). |
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| 摘 要： | 珠江口盆地的形成和演化过程经历了晚白垩世至渐新世的裂陷—晚渐新世至中中新世的热沉降—晚中新世至今的断块升降3个演化阶段,沉积了陆相—半封闭海相—开阔海相3套不同的沉积体系组合。总结归纳出珠江口盆地新生代3个阶段的沉积充填模式,并发现:裂陷阶段以充填式堆积和河湖沉积为特征,形成盆地最重要的湖相烃源岩———文昌组泥岩;热沉降阶段以海陆交替、海相沉积体系为特征,为形成良好的储盖组合创造了条件,沉积了珠江口盆地内最主要的储油层系———珠海组、珠江组以及韩江组,主要为滨海相、三角洲相等碎屑岩沉积;晚期盆地整体下沉,区域性盖层形成。该沉积组合反映了张性边缘海盆地的演化特点,盆地演化与资源效应表现在裂陷期、热沉降期及断块升降期的生储盖配置,故勘探目的层段为热沉降阶段所形成的三角洲碎屑岩与陆棚碳酸盐岩。
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| 关 键 词： | 珠江口盆地 张性边缘海 成因演化 沉积充填模式 |
| 文章编号： | 1000-8527(2004)03-0284-06 |
| 修稿时间： | 2004年1月6日 |
GENETIC EVOLUTION AND DEPOSITIONAL FILLING MODEL OF TENSIONAL MARGINAL SEA BASIN:TAKE THE PEARL RIVER MOUTH BASIN AS AN EXAMPLE |
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| ZHANG Zhi-jie,YU Xing-he,HOU Guo-wei,CHEN Rui.GENETIC EVOLUTION AND DEPOSITIONAL FILLING MODEL OF TENSIONAL MARGINAL SEA BASIN:TAKE THE PEARL RIVER MOUTH BASIN AS AN EXAMPLE[J].Geoscience——Journal of Graduate School,China University of Geosciences,2004,18(3):284-289. |
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| Authors: | ZHANG Zhi-jie YU Xing-he HOU Guo-wei CHEN Rui |
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| Abstract: | Pearl River Mouth Basin, an epicontinental sea and marginal sea basin, is one of depositional basins abundant in oil and gas in China. Its formation and evolutive process could be divided into three phases: rifting phase from Late Cretaceous to Early Oligocene, thermal subsidence phase from Late Oligocene to Mid-Miocene, faulted block uplifting and sagging from Late Miocene to the present, forming three assemblages of depositional system, such as continental facies, semi-closed marine facies and open marine facies respectively. On the basis of the seismic data, a Cenozoic depositional model of this basin has been established. At the initial rifting phase, filling patterns of the basin were characterized by fluvial and lacustrine facies; in the meantime, Wenchang Formation, the most important source strata, had been formed. At the thermal subsidence phase, the transitional facies and marine facies were the typical depositional systems in this basin, so that the favorable combinations of reservoir and seal were provided. At this phase, three major oil-bearing systems were formed in Zhuhai Formation, Zhujiang Formation and Hanjiang Formation, which belong to a coastal and delta depositional system. At the third phase, faulted block uplifting and sagging, the subsidence of the basin occurred and the regional seals were formed. These depositional assemblages reflected the features of extensional marginal sea basin's evolution. Basin evolution and resource effect represent the match of seals, reservoirs and source rocks in these three phases. Therefore, the favorable strata for hydrocarbon exploration are the clastic rocks of delta and the continental shelf carbonate rock formed in thermal subsidence phase. |
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| Keywords: | Pearl River Mouth Basin marginal sea genetic evolution depositional filling model |
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