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BARDAN, VIRGIL, Prospectiuni S.A., Bucharest, Romania

ABSTRACT: Sampling 3-D Seismic Data

A three-dimensional (3-D) seismic survey is usually achieved by recording a parallel profile network. The 3-D data thus obtained are sampled and processed in a cubic grid for which the sampling requirements generally are derived from the usual one-dimensional (Previous Hit1-DNext Hit) viewpoint. The spectrum of 3-D seismic data has a bandregion (the region of the Previous HitFourierNext Hit space in which the spectrum is not zero) that can be approximated by a domain bounded by two cones. Considering the particular shape of this support, we use the 3-D sampling theory to obtain results applicable to the recording and processing of 3D seismic data. This naturally leads to weaker sampling requirements than the Previous Hit1-DTop viewpoint. We define the hexagonal noncubic sampling grid and the triangular noncubic sampling grid and show that fewer sample points are needed to represent 3-D seismic data with the same degree of accuracy. Thus, using the hexagonal noncubic sampling grid, we point out that the maximum value of the spatial sampling interval along the profiles is larger by 15.6% than the one of the cubic sampling grid. We also point out that the triangular noncubic sampling grid requires a number of sample points equal to half the number required by a cubic sampling grid.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.