Abstract: Interactive Graphics in Subsurface Stratigraphic Analysis

Claude G. Abry

The Geotek Exploration Support System is a collection of interactive computer programs designed to assist geologists in the description of subsurface stratigraphy. The graphics station is composed of a CRT with 19-in. (482.6 mm) display area, coupled with a digitizing table and a hard-copy unit, and linked to a large computer equipped with time-sharing and virtual systems. The station also has access to different types of plotters. The main program functions are the collection of data in a project file either by retrieval from a data base or by using interactive digitizing and data entry. Structural, stratigraphic, and lithofacies data are displayed in the form of base maps, contour maps, cross sections, and trend-surface maps. Grid-to-grid operations are useful for volum computations within property boundaries, slicing techniques, convergence mapping, and the merging of well and seismic data. Using a crosshair cursor on the CRT screen to guide the program in interpreting data, a geologist can contour maps involving faults.

Other advantages of interactive computer graphics are the greater simplicity of operating programs in the conversational mode, and the ability to view and correct graphics on the CRT screen prior to large-scale plotting on electrostatic or ink-pen plotters. Exploration data are analyzed at low cost without delay, and the geologist's effectiveness is greatly enhanced.

AAPG Search and Discovery Article #90961©1978 AAPG Annual Convention and Exhibition, Oklahoma City, Oklahoma