--> ABSTRACT: Two-Dimensional Vs. Three-Dimensional Interpretation Comparison in High Island Area, by Gary L. Snyder; #91022 (1989)

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Two-Dimensional Vs. Three-Dimensional Interpretation Comparison in High Island Area

Gary L. Snyder

A structural seismic interpretation comparison involving two-dimensional (2-D) vs. three-dimensional (3-D) data from the High Island area of offshore Texas reveals significant interpretative advantages in using 3-D seismic mapping procedures. Differences in fault delineation and the positioning of structural highs and lows are illustrated using computer contour maps and time slice/vertical section compositions derived through interactive workstation application. Incorporated into the comparison are the following studies: (1) structural mapping of 2-D grid and 3-D volume over a common area; (2) correlation of synthetic seismograms with the seismic data in order to calculate phase-matching filters; (3) measurement of areal extent of anomalous amplitude events associated wit hydrocarbon-bearing Pleistocene sands, based on interactive amplitude extraction and interactively derived reflection strength attribute; and (4) amplitude vs. offset (AVO) calculations of anomalous amplitude events.

The continuous volumetric nature of 3-D seismic data allows accurate interpretation of faults and horizons both temporally and laterally. The extension of such interpreted events out of the vertical plane, which conventional 2-D seismic data attempts to image, clearly invokes a great amount of subjectivity into the exploration task. In many instances this subjectivity can be tolerated. However, optimal field development requires the precise structural description of subsurface features that only a dense coverage survey can provide.

AAPG Search and Discovery Article #91022©1989 AAPG Annual Convention, April 23-26, 1989, San Antonio, Texas.