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The image above is a brute CRE stacked section obtained after CRE Gather Stacking workflow. CRE gahters are used to build the stacked section without a priori knowledge of the macrovelocity model and without previous velocity analisys. And the can be used in inversion algorithms in order to obtain the velocity model, that can include vary laterally.
To build a CRE gather, someone should follow the steps bellow:
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Get Zero offset CRS parameters (RN, RNIP and BETA): We developed a program that can get those CRS parameters from the seismic data cube using Very Fast Simulated Aneeling (VFSA) Global optimization. This program is available in the Madagascar seismic processing package too. (To know more about vfsa)
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Interpolated the seimic data cube: CRE gathers demands a data interpolation in order to increase the CMP sampling to allow the CRE gather building. Because CRE gathers are traces above a parabolic curve in the CMP x Offset plane defined in function of a assimetry parameter alpha(RNIP, BETA). It can be done with Predictive Adaptive Error Filters (PEF) in a interpolation process.
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Finally, build the CRE gathers searching traces in the seismic data cube which CMP and Offset coordinates are close enough to the CRE trajectory, calculated with the help of a CRE equation that relates the CMP and offset of a seismic trace that pertain to a CRE gather in function of RNIP and BETA.
The image bellow is a CRE Gather obtained with the process described above:
- v0.1 (Instable)
- v1.0 (Beta - In progress)
- The creGatherInterpolation programs are designed for the Madagascar seismic processing package. In order to use them, you should install the actual Madagascar stable version.
- Follow the steps in the Installation section of our README to add the programs in the current version of your Madagascar package.