Q analysis on reflection seismic data
Q analysis on reflection seismic data
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DOI：
10.1029/2004gl020572
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发表时间：
2004-09
影响因子：
5.2
通讯作者：
Yanghua Wang
中科院分区：
文献类型：
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作者：
Yanghua Wang
Q分析是指直接从反射地震道估计Q的过程。传统的Q分析方法是比较从不同深度（或时间）上选取的两个地震子波，但从一条反射地震道中选取不受其它子波干扰和噪声干扰的“干净”子波是一个难题。因此，而不是分析个别小波，我执行Q分析使用的Gabor变换频谱，揭示了随时间变化的频率内容在地震道。提出了两种基于衰减函数和补偿函数的Q分析方法，每种方法都可以产生一系列Q-1的平均值（逆Q），在记录表面（或水底）和地下时间样本之间求平均。但后者比前者稳定得多。然后，我通过约束线性反演计算Q−1的区间或分层值，这产生了区间-Q序列的稳定估计。
Q analysis refers to the procedure for estimating Q directly from a reflection seismic trace. Conventional Q analysis method compares two seismic wavelets selected from different depth (or time) levels, but picking “clean” wavelets without interferences from other wavelet and noise from a reflection seismic trace is really a problem. Therefore, instead of analysing individual wavelets, I perform Q analysis using the Gabor transform spectrum which reveals the frequency content changing with time in a seismic trace. I propose two Q analysis methods based on the attenuation function and compensation function, respectively, each of which may produce a series of average values of Q−1 (inverse Q), averaging between the recording surface (or the water bottom) and the subsurface time samples. But the latter is much more stable than the former one. I then calculate the interval or layered values of Q−1 by a constrained linear inversion, which produces a stable estimation of the interval‐Q series.