3-D Geologic Modeling and Visualization of Faulted Structures Theory and GIS

百花草

1 Introduction
Modeling of geologic structures plays an important rule towards a better understanding
and deciphering many problems in the field of the subsurface structures. Geological
mapping of subsurface structures formed through various successive events can be
conducted through logical modeling of these events in relation to the geologic units and
surfaces.
In the present work, we extended an algorithm for logical modeling of geologic structures
formed through a sequence of sedimentation and erosion to be used in modeling of the
faulted geologic structures [1].
In our approach, we defined the fault as a plane dividing a three-dimensional geologic
unit and the open space into two blocks, with the geologic structures formed through
sedimentation and erosion saved in each block [2]. With such an extended logical model,
faulted geologic structures can be analyzed in space and time in an easy way of computer
processing including estimation of surfaces and 3-D visualization of the geologic
structure.
In the next few sections, an algorithmic approach for the sedimentation and erosion
logical model will be conceptually introduced, and an expression for the logical model of
faulted geologic structures will be presented. Further, the example of application for the
logical model of faulted geologic structures is shown using a 3-D visualization tool
“Nviz” in GRASS GIS.

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