Abstract
In these days of interactive workstations, high-powered computers, and mass data storage, it is easy to forget that 35 years ago 3D seismology was considered only a dream by most explorationists. The conventional seismic survey in 1974 consisted of a grid of 2D lines processed through unmigrated CMP stack and displayed and interpreted on paper sections. Interpretation of complex geology from these data depended on the ability of experienced geophysicists to sort out conflicting reflectors and apply mechanical or map migration to contoured time horizons. 2D digital migration was showing promise but not generally accepted due to resulting mis-ties at line intersections and uncertainties regarding proper velocities to use during migration. Although we recognized the need to address the shortcomings of 2D profiling, there was widespread skepticism regarding the practicality of 3D seismology, including concerns about costs, computer resources, and technical feasibility.
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