Color Graphics and Computer Mapping Techniques Applied to Reappraisal of a Mature Oil Field

WONG, JAN-CHUNG, Kansas Geological Survey, Lawrence, KS, and K. DAVID NEWELL, University of Kansas, Lawrence, KS

Reappraisal of mature oil fields for new drilling and development requires gathering and understanding large amounts of geologic data. Although translating this information into computer databases is usually a tedious effort at the front end of a project, this time will be justified near the end of the project by computational versatility and increased graphical display capabilities. If properly applied, color graphics can be very valuable in the decision-making process.

As an example, the Zenith field in central Kansas, which covers 16 mi2 with wells at 10- to 40-acre spacings, is illustrated using a series of color maps displaying geologic and well data. Color maps with various shades of a given color provide attractive and readily understandable display of isopach, porosity, and porosity-feet information. Data regarding individual wells are effectively presented by placing at mapped well locations color-coded symbols that depict completion dates, abandonment dates, and years producing. Size and color differentiation of these symbols aid in identifying pay zones producing at each well, production potentials, gas-oil ratios, and water-oil ratios. Volumetric information, such as remaining oil in place and associated water saturations, are displayed on maps as colored patches that correspond to specific geographic areas. Computer-generated cross sections constructed from well formation tops also aid in illustrating geologic relationships that may not be readily evident.

Color graphics like those listed above helped quickly convey information to geologists and engineers. In turn, decisions were made of where the field would further develop.

AAPG Search and Discovery Article #91008©1991 AAPG Mid-Continent Section Meeting, Kansas Geological Society, Wichita Kansas, September 22-24, 1991 (2009)