Spectral-ratio tomography for attenuation estimation

In the measurement of surface seismic data, an accurate attenuation-estimation method is necessary to compensate for the energy loss and phase distortion of seismic waves, and also beneficial for further quantitative amplitude analyses and reservoir parameters prediction. We design a more accurate Q tomography method to estimate Q values. This method inverts for the Q values in the overburden and target layer simultaneously without assumptions on the overburden, which allows us to separate the overburden effect during the inversion. As Q tomography methods estimate Q value by assuming the source wavelet is known, the results of Q value are often affected by the errors of the calculated source wavelet. Thus, from the same source, we take the spectral ratio of two reflections from the top and bottom of a target layer as an alternative for tomography input. For the log spectral ratio (LSR) method and attenuated traveltime tomography (t* tomography), picking two reflections at different tra...