--> Abstract: Three-Dimensional Fault Modeling from Cross-Sectional Data, by S. Zoraster and S. Bayer; #90987 (1993).
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ZORASTER, STEVEN, and STEPHEN BAYER, Landmark Graphics Corporation, Austin, TX

ABSTRACT: Three-Dimensional Previous HitFaultNext Hit Modeling from Cross-Sectional Data

A recent and significant improvement to modeling faulted horizon models for the petroleum industry has been the introduction and use of three-dimensional Previous HitfaultNext Hit models. Three-dimensional Previous HitfaultNext Hit models create opportunities for enhanced understanding of geologic environments.

Collecting Previous HitfaultNext Hit data usually starts with the geoscientist interactively interpreting Previous HitfaultNext Hit "profiles" from seismic sections, or from a geologic cross-sections program. Correlated Previous HitfaultNext Hit profiles provide data for building 3-D Previous HitfaultNext Hit models.

Many faults have relatively small dip angles. These faults can be modeled safely using industry-standard horizon modeling algorithms. However, modeling vertical faults, shallow listric faults, or "scissor faults" in the project (x, y, z) coordinate space often produces poor models. A solution to this problem is to model each Previous HitfaultNext Hit in its own unique (u, v, w) coordinate system.

Defining a coordinate system for a Previous HitfaultNext Hit involves calculating a "strike-dip" plane for the Previous HitfaultNext Hit. The strike-dip plane is spanned by a vector in the project (x, y) plane which follows the Previous HitfaultNext Hit strike, and by an orthogonal vector that follows the Previous HitfaultNext Hit dip. The cross product of these vectors defines a vector and coordinate (w) normal to the Previous HitfaultNext Hit plane.

A strike-dip plane coordinate system usually provides coordinates in which a Previous HitfaultNext Hit surface, measured by the w coordinate, will be a single valued function of its (u, v) coordinates. The use of rotated Previous HitfaultNext Hit coordinate systems leads to some computational problems; however, these problems are minor compared to the ease with which data to support modeling of faulted horizons can be extracted from 3-D Previous HitfaultTop models.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.