李俞锋;蒲仁海;牛宁;李斌;

• 1:西北大学大陆动力学国家实验室
• 2:西北大学地质学系
• 3:陕西省一八六煤田地质有限公司

摘要(Abstract)：

谷-丘互相对称(下伏地层的谷与丘分别对应上覆地层的丘与谷)的地震反射很少引起关注,但随着地震勘探技术的广泛应用,这类地震反射发现得越来越多,其成因也各不相同。总结了5类谷-丘互相对称的地震反射,其成因类型有蛋白石-A转变成蛋白石-CT、泥岩密度反转、底流侵蚀沉积、在深水环境中以砂岩充填为主的水道(富砂水道)的差异压实、侵入岩岩床。南海琼东南盆地北礁凹陷谷-丘互相对应的地震反射与这5类反射的对比表明,北礁凹陷谷-丘互相对称的地震反射属于这5类中的底流侵蚀沉积成因类型,同时揭示了北礁凹陷中中新统谷-丘为晚中新世早期等深流(底流)剥蚀的结果,之后底流减弱以沉积为主,在中中新统谷-丘的上方形成各自对应的丘-谷,上中新统的谷具有明显的迁移削截现象且伴有浊流沉积,这是与其他4类(无迁移无浊流)谷-丘互相对称地震反射特征的根本区别。

关键词(KeyWords)： 丘-谷互相对称;蛋白石-A;蛋白石-CT;底流侵蚀;差异压实;岩浆岩岩床;北礁凹陷

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2011ZX05025-006-02);; 国家自然科学基金项目(41390451)

作者(Author): 李俞锋;蒲仁海;牛宁;李斌;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0339

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