Steven Zoraster, 1992. "Fault Representation in Automated Modeling of Geologic Structures and Geologic Units", Computer Modeling of Geologic Surfaces and Volumes, David E. Hamilton, Thomas A. Jones
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The standard petroleum industry technique of treating faults as opaque barriers in structure and unit modeling does not provide the accurate models and hardcopy maps required today for hydrocarbon exploration and production efforts. The shortcomings of these old methods is especially apparent when attempting to develop cost-effective models of small hydrocarbon reservoirs.
The process of incorporating fault surfaces into digital subsurface models is going through a period of rapid change as new techniques for incorporating fault geometry into structure and unit modeling applications have been introduced over the last few years. These methods, which are reviewed in this chapter, provide superior solutions to the problem of incorporating faults into subsurface modeling and mapping efforts than techniques which simply treat faults as opaque barriers. However, these methods represent only interim solutions.
Inevitably, full 3-D subsurface modeling in faulted environments will replace the two-dimensional programs now available. Experimental algorithms have been developed for modeling and editing structures which have multiple depth values for single (X,Y) coordinates, such as structures cut by reverse faults or structures that include over-turned folds. At the same time, geophysicists are exploring new methods for determining both structure shapes and rock properties from seismic data.
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A collection of papers on computer-mapping case studies, this publication is a useful “go-by” for both beginners and advanced users of computer-mapping software. Fore the most part, the papers concentrate on the geologic features of significance to mapping, the methods used and their justification, and results obtained. The publication is separated into two parts. Part 1 consists of 12 papers dealing with data and surface modeling. Part 2 consists of 7 papers dealing with three-dimensional geologic block modeling.