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东海外陆架残留沉积中硫复铁矿的发现及其油气指示意义

, PP. 70-77

Keywords: SIRM异常,硫复铁矿,油气渗漏,残留沉积,东海外陆架

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Abstract:

1994~1995年间在东海外陆架获取370个柱状样,每个样长约为2~4m.对其底部沉积物作了磁性测试,发现局部地区存在SIRM异常高现象.由磁参数推断导致SIRM异常的矿物为硫复铁矿.将磁性异常地区沉积物作矿物磁选,对磁选所得矿物做扫描电镜、电子探针和能谱、X衍射及穆斯堡尔谱测试,证实了次生硫复铁矿的存在.结合本区新生代油气构造圈闭和残留沉积物可溶铁Fe3+/Fe2+比值异常的分布,用油气渗漏解释了SIRM异常及硫复铁矿的成因,从而认为SIRM异常对深部油气藏具有指示意义.

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