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频谱分解技术在深层致密砾岩气藏检测中的应用

Keywords: 频谱分解,致密砾岩储层,含气性检测,频谱道集衰减,产气量,徐家围子

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Abstract:

?徐家围子营四段气藏是陆相断陷湖盆形成的深层致密砾岩气藏,具有低孔渗、厚度变化大、强非均质性等特点。该区共有96口井钻通营四段,有21口井在营四段试气,发现含气层段频谱中频率均有降低现象。据此,本文采用频谱分解技术对营四段砾岩进行了含气性检测;进而对频谱道集衰减特征进行分类,拟合出的衰减角度与产气量之间呈正相关关系。利用该方法对徐家围子营四段无井区进行了含气性检测,预测的有利储层分布范围符合断陷盆地断裂控制气藏分布规律,且与溶蚀孔隙发育带分布范围相吻合。

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