Abstract: A method of comparing multiple seismic survey data sets of a reservoir, is provided, wherein a first seismic survey data set is taken at a first time and a second seismic survey data set is taken at a second time, to detect changes in the reservoir between the first time and the second time. Generally, the method comprises design of a crossequalization function for the second data set based on a comparison of unchanging portions of the two data sets. Also provided is a processing method for preparing each survey according to similar processing steps with information taken from each survey.

Abstract: Method and systems are provided for processing c-wave data resulting in less sensitivity to errors in p-wave velocity analysis. Therefore, according to one aspect of the invention, a process is provided for processing c-wave data, the process comprising: providing zero-offset gather without a hyperbolic movement correction; performing migration on the zero-offset gather; performing velocity analysis on the migrated zero-offset gather; and performing NMO on the migrated data using the velocity from the velocity analysis.

Abstract: A method and system for processing first and second seismic traces includes rotating the first seismic traces and the second seismic traces to forty-five degrees in the time domain. In one embodiment, the rotated first time domain traces and second time domain traces are transformed to the frequency domain to obtain an amplitude spectrum for each rotated first time domain trace and an amplitude spectrum for each rotated second time domain trace. Each amplitude spectrum is squared to obtain a power spectrum for each transformed and rotated time domain trace. The phase of each transformed rotated time domain trace to zero. The power spectrum for each transformed rotated time domain trace is then averaged. Each transformed rotated time domain trace is divided into time windows. A power spectrum for each window is obtained for the entire of each transformed rotated time domain trace. The power spectra of each window of the transformed rotated time domain trace is summed to obtain a summed first power spectrum.

Abstract: Methods and systems are provided for orientation of multicomponent geophones, for rotating traces, and for correcting polarity differences between traces. According to an example embodiment, a receiver orientation angle is assigned, based on a determination of an angle between one or more horizontal components and one or more sources.