This report presents the results of a comprehensive reservoir description and reservoir engineering study completed on Harken Energy Corporation's Anasazi/Sahgzie reservoir in the Paradox Basin in Utah. The study is part of a larger assessment program designed to determine the geologic and reservoir production performance characteristics of small shallow-shelf carbonate reservoirs in the Paradox Basin of Utah, Colorado and Arizona. The overall program is sponsored under the Class II Oil Program of the U. S. Department of Energy. The principal objectives of the study were to develop a detailed quantitative description of the subject reservoir and use this description coupled with composition simulation to predict the performance of the mound complex under three different reservoir recovery processes. The three processes included primary depletion, C02 flooding and water flooding.