High-speed HighRes velocity estimation from seismic data
PSS-Geo Developed and tested the new method of HighRes Velocity building. It is based on Dynamic auto correlation, Dynamic Time Warping and amplitude based methods.
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Original Seismic Interval Velocity and HighRes velocity are shown below.
Estimation from seismic data
Traditionally, seismic velocities have been estimated from semblance analyzes (kinematic method). The analyzes can be done manually or automatically. The Velocity Field generated by such methods can be used for further processing of seismic data, but is lacking resolution to be used for lithology and fluid predictions. Relative velocities can be estimated from seismic amplitudes (dynamic methods) with higher resolution. The amplitude response is a function of both seismic velocities and the density of the rock. Therefore, in order to separate the velocity response from the dynamic amplitude based method, it is necessary to calculate a higher resolution kinematic velocity field. We develop a high resolution kinematic velocity calculation based on estimating the time differences between the different traces of the gathers directly. Time differences are used to calculate the velocity field. To calculate time differences, we use both methods based on dynamic auto correlation and Dynamic Time Warping. Using both methods, a high velocity field achieves a semblance-based approach. When combining this methods with amplitude based methods, we achieve a high resolution velocity field suitable for litology and fluid prediction.