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高分辨率全信息烃检方法研究及应用
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摘要
现有的叠后烃检方法一般都是利用振幅和频率相关信息对油气进行检测,如亮点属性、甜点属性、低频伴影和流体流度等方法。然而,基于振幅和频率信息的烃检方法不能有效地区分具有相同地震响应特征的储层含油气性,具有一定局限性。为此,本文研究并提出了全信息烃检方法,即引入相位信息作为振幅和频率信息的补充,这样充分利用动力学特征进行油气检测,可以降低烃类检测的多解性和不确定性。首先实现了提取时频相位谱信息的高分辨率稀疏反演谱分解方法,该方法一方面提高了时间分辨率,另一方面可以有效、准确地求取时变子波的相位信息用于油气检测。然后,在依赖频率的反射系数低频渐近分析理论基础上推导出了基于高分辨率稀疏反演谱分解的储层流体流度计算方法。最后,将流体流度属性和时频相位谱信息有机结合起来形成了全信息烃检方法。通过对实际资料处理结果表明,本文提出的全信息烃检方法分辨率非常高,对于含油气储层显示了良好的成像能力,降低了烃类检测的多解性和不确定性。
引文
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