| 琼东南盆地沉积环境及物源演变特征 |
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| 引用本文： | 邵磊,李昂,吴国瑄,李前裕,刘传联,乔培军. 琼东南盆地沉积环境及物源演变特征[J]. 石油学报, 2010, 31(4): 548-552. DOI: 10.7623/syxb201004005 |
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| 作者姓名： | 邵磊 李昂 吴国瑄 李前裕 刘传联 乔培军 |
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| 作者单位： | 同济大学海洋地质国家重点实验室 上海 200092 |
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| 基金项目： | 国家重点基础研究发展规划(973)项目，国土资源部全国油气资源战略调查与评价项目，国家科技重大专项，国家自然科学基金 |
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| 摘 要： | 运用沉积地球化学、古生态学等手段对琼东南盆地渐新世-中新世沉积环境及沉积物源区特征进行了分析研究，认为渐新世崖三段为淡水滨岸环境，之后海水逐步加深，由海陆过渡环境，演变到崖一段的海湾环境。盆地东部与西部在沉积物源上存在明显差异：在盆地西部的崖城隆起地区，沉积物源区存在较多的基性岩成分，特别是自陵二段开始，基性岩成分所占比例明显增高；盆地东部的松东、宝岛和松南凹陷具有明显混合物源的特性。琼东南盆地存在3套潜在的烃源岩,即始新世湖相烃源岩、渐新世海陆过渡相烃源岩和中新世半深海-深海相烃源岩，松东、宝岛凹陷陵水-三亚期的储层物性要好于松南凹陷。
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| 关 键 词： | 南海 琼东南盆地 渐新世-中新世 沉积环境 物源特征 |
| 收稿时间： | 2010-01-05 |
| 修稿时间： | 2010-02-26 |
Evolution of sedimentary environment and provenance in Qiongdongnan Basin in the northern South China Sea |
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| SHAO Lei,LI Ang,WU Guoxuan,LI Qianyu,LIU Chuanlian,QIAO Peijun. Evolution of sedimentary environment and provenance in Qiongdongnan Basin in the northern South China Sea[J]. Acta Petrolei Sinica, 2010, 31(4): 548-552. DOI: 10.7623/syxb201004005 |
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| Authors: | SHAO Lei LI Ang WU Guoxuan LI Qianyu LIU Chuanlian QIAO Peijun |
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| Abstract: | The sedimentary environment and provenance characteristics in the Qiongdongnan Basin during the Oligocene and Miocene periods were analyzed using geochemical and paleoecological methods.The results indicate that,during the early Oligocene,the basin was prevailed by freshwater to littoral environments for the deposition of section 3 of the Yacheng Formation,then altered to sea-land transitional conditions with sea water deepening gradually for section 2,and finally to gulf to outer shelf environments for section 1 of the Yacheng Formation.Apparent differences in the provenance exist between the eastern and the western parts of the basin.While the Yacheng ridge area westward contains mainly sediments of mafic composition,which increases proportionally especially since section 2 of the Lingshui Formation,in the east such as the Songdong,Baodao and Songnan sags are characterized by a mixture of provenance during the late Oligocene.Moreover,the Qiongdongnan Basin comprises three sets of potential hydrocarbon source rocks,namely a lacustrine phase in the Eocene period, a sea-land transition phase in the Oligocene period, and a deep-sea phase in the Miocene period. The late Oligocene to early Miocene Lingshui-Sanya formations in the Songdong and Baodao sags show better reservoir properties than that in the Songnan sag. |
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| Keywords: | South China Sea Qiongdongnan Basin Oligocene-Miocene period sediment environment provenance characteristics |
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