Seismic contouring is a unique skill that requires combining the variable nature of the seismic signal with the varying structural styles of rock deformation. The computer is very helpful in producing suites of maps quickly, but it has often failed to incorporate structural styles and faults into meaningful geologic contours. This integration requires a visual image of the evolving structures that can best be obtained by an interpreter’s hand contouring or with an interactive work station guided by an interpreter’s hand. Each of the following situations requires a different approach to contouring and mapping the seismic data: (1) Three major styles of rock folding— (a) concentric folding, requiring smooth, hyperbolic contours: (b) plastic flow, requiring parallel contours and rounded reversals; and (c) topographic folding, requiring equal‐spaced contours and closed highs and lows. (2) Faults—May be difficult to visualize unless they are properly annotated and integrated into the contours. (3) Isotime maps—Should be contoured in the shape of depositional bodies. (4) Phantom horizon and dip maps—Needed when there are no continuous horizons. These maps can be useful as reconnaissance maps for planning programs in frontier areas. (5) Prospect (manager’s) maps—The summation of all previous maps. They must be precise, clear, and simple. They must say, “Here’s the oil!”
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