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“亮点”型含气储层与薄层调谐的识别

Keywords: 时频连续小波变换,薄层调谐,含气储层,频率,瞬时振幅

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Abstract:

?能否成功识别“亮点”型含气储层与薄层调谐关系到岩性油气藏勘探的成败.地层的薄层调谐常常会导致叠加剖面上出现假“亮点”,假“亮点”与含气储层亮点有本质的区别.根据实际储层的岩石物理参数,设计了楔形和薄层地质模型,模拟了薄层及薄互层调谐现象,研究了调谐现象与频率之间的关系和“亮点”型含气储层产生的强振幅与频率之间的关系.marmousiⅱ模型数据的测试结果表明,利用连续小波变换后能量归一化的分频剖面之间的瞬时振幅差异可以有效地区分“亮点”型含气储层产生的强振幅与薄层调谐导致的强振幅,从而为地震剖面真、假亮点识别提供了一种新的思路.实际地震资料处理结果表明,该方法可以较好地识别“亮点”型含气储层,从而在一定程度上降低了油气田勘探开发风险.

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