OALib Journal期刊
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基于谱分解的气藏识别技术与应用
Keywords: 广义s变换,谱分解,反射率法,avo
Abstract:
?地震波传播穿过含油气砂岩时,高频能量发生明显衰减,研究地震波的这种衰减特征可以为油气检测提供有效信息。本文利用三类含气砂岩模型,针对完全弹性介质和盖层为弹性介质、储层为衰减介质两种情形,利用基于波动理论的反射率法分别正演模拟其相应的叠前地震记录,并利用广义s变换对模拟记录进行分频处理,分析不同频率时avo特征。研究表明,弹性介质条件下avo响应曲线不受频率影响;盖层为弹性介质、储层为衰减介质时不同频率的avo响应曲线不同,随频率增加地震波衰减增大。据此对s油田实际资料进行分析,结果表明含气层表现出异常高衰减特性,利用谱分解技术可以有效预测气层的分布。
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