琼东南盆地南部中新统“丘”形反射成因探讨

赵天亮; 蒲仁海; 屈红军; 张功成; 梁建设; 冯杨伟

doi:10.3969/j.issn.0253-4193.2013.04.014

琼东南盆地南部中新统“丘”形反射成因探讨

doi: 10.3969/j.issn.0253-4193.2013.04.014

1.
西北大学地质学系, 陕西西安 710069
2.
中国海洋石油研究中心勘探研究院, 北京 100027

基金项目: 国家科技重大专项子课题“南海北部深水区大型生物礁滩分布与成藏条件分析”(2011ZX05025-006-02);国家自然科学基金:“华北南缘与西缘早古生代等深流沉积特征类比及地质意义”(41172101)。

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出版历程
- 收稿日期: 2012-07-27
- 修回日期: 2013-01-31

An origin discussion of mound-shaped reflections in Miocene, southern Qiongdongnan Basin

1.
Department of Geology, Northwest University, Xi'an 710069, China
2.
Exploration Institute of China National Offshore Oil Corporation Research Center, Beijing 100027, China

摘要

摘要: 在琼东南盆地南部中新统梅山组广泛发育“丘”形反射, 对其识别分析具有重要的意义。这些“丘”形反射主要分布在北礁凹陷及周缘斜坡带上, 在顶底界面呈强反射, 在内部成层、杂乱或为空白反射, 有时在顶部见披覆沉积, 从盆地中心北礁凹陷向边缘斜坡带迁移生长。通过对“丘”形反射的古构造和古地理背景、几何学特征及地震响应特征等方面综合分析, 对其成因进行了探讨, 排除了其为生物礁、泥底辟以及火山丘的可能, 认为其可能为深水环境底流作用下形成的等深流沉积或某种沉积物波。
- “丘”形反射 /
- 地震反射特征 /
- 中新统 /
- 琼东南盆地 /
- 南海北部深水区
Abstract: Mound-shaped reflections of Miocene Meishan formation are widely developed in southern Qiongdongnan Basin. Their identification and analysis are of important significance both for sedimentology research and hydrocarbon exploration. They are mainly located in the Beijiao depression and its surrounding slopes, with high amplitudes on top and bottom interfaces and weak reflections in its interior. Sometimes lateral drape reflections exist on the mound top and mounds migrate in a way of growth from structural depression toward higher slopes. In addition of the comprehensive analysis of the palaeotectonic and paleogeographic background, geometry and distribution and impedance of mound-shaped reflections suggest that they should not probably originated by reef or/and mud diapirs and volcanoes. Instead they may be contour currents deposits or some kind of sediment wave formed under the bottom currents in deep-water environment.
- mound-shaped reflections /
- seismic reflection characteristics /
- Miocene /
- Qiongdongnan Basin /
- deep-water region of northern South China Sea

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