CAJ | 학술논문

应用拟合追逐分解MPD(Matching pursuitdecomposition)法对地震数据进行谱分解能够提供更好的分辨率,在时间分辨率和频率分辨率上到达一致,避免付氏变换方法中时窗大小选择和分析时间点不准确的问题.含气地层对纵波资料产生较大的频率衰减,在储层下方可能见到低频强振幅的低频阴影现象.而转换波资料受气藏影响小,在转换波剖面中不会出现同纵波类似的低频阴影区.因此,综合两种资料在分频剖面上的表现,可以进行含气性异常的预测.对已知气藏的实际多波地震资料,进行MPD分频处理,在不同波场的分频剖面上,分析气层响应特征.
응용의합추축분해MPD(Matching pursuitdecomposition)법대지진수거진행보분해능구제공경호적분변솔,재시간분변솔화빈솔분변솔상도체일치,피면부씨변환방법중시창대소선택화분석시간점불준학적문제.함기지층대종파자료산생교대적빈솔쇠감,재저층하방가능견도저빈강진폭적저빈음영현상.이전환파자료수기장영향소,재전환파부면중불회출현동종파유사적저빈음영구.인차,종합량충자료재분빈부면상적표현,가이진행함기성이상적예측.대이지기장적실제다파지진자료,진행MPD분빈처리,재불동파장적분빈부면상,분석기층향응특정.
Spectral decomposition using the method of Matching Pursuit Decomposition (MPD) for PP- and PS-wave data has higher resolution and higher consistency over the entire time-frequency plane. The MPD algorithm avoids the problems of inaccurate analytic time point and the time window size choice that may occur during a Fourier transform. The PP-wave attenuation is greater than the PS-wave attenuation while propagating through gas reservoirs. There are some stronger amplitude low-frequency shadows on the PP-wave single frequency sections beneath gas reservoirs which are not seen on corresponding PS wave single frequency sections. Therefore, hydrocarbons are predicted from comparing the behavior on both frequency sections. The time-frequency analysis for multi-component data is decomposed by MPD for data from northeast China containing rich gas reservoirs. The gas response character is analyzed on different wave mode single frequency sections. We describe the MPD algorithm, compare it to other spectral decomposition methods, and show some examples of detecting low-frequency shadows beneath gas reservoirs.