Merging 3D Seismic Surveys
During the last twenty years 3D Seismic has been used covering many areas of the globe by numerous companies. Many times these surveys were designed for a specific exploration objective. As these surveys were normally for a specific oil company, the designers did not concern themselves with, or were not aware of, the surrounding 3D surveys. When these surveys were processed, they did not use any of the additional data. Oil companies today wish to use this information and prefer to have all the surveys, time and depth, migrated on a common grid without any seams or differences between the data sets.
Over the last few years Fairfield Industries has acquired vast experience merging multiple surveys, both onshore and offshore, with varying acquisition parameters, orientations, varying source and receiver types, and varying acquisition systems. The issues of geometry, phase, noise removal, and amplitude conditioning are all addressed individually and globally to correct any survey dependent issues. Global solutions are applied for refraction and residual statics. During migration all surveys are output to a common grid, using proprietary techniques to manage offsets, fold and amplitudes which facilitate output of AVO compliant data. Over 5000 square miles of land and transition zone data and thousands of square miles of OBC data have been processed using these techniques with outstanding results.
