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Many basins are dominated by vertical hydrocarbon migration. On seismic data, the vertical migration paths are generally recognized as vertically aligned zones of chaotic, often low-amplitude reflectivity. These are described variously as gas chimneys, blowout pipes, gas clouds, or hydrocarbon-related diagenetic zones. Analysis of the gas chimneys can be used for geohazard prediction, basin modeling, prospect risking, and many more applications. However, the weak expressions of gas chimneys in seismic data make them difficult to map. Thus, a method for detecting gas chimneys in poststack 3D seismic data has been developed to map their distribution and allow them to...

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