HARRIS, JOHN H., and PAUL E. HARNESS
Texaco Exploration and Production Inc., Bakersfield, CA
Abstract: 4-D Reservoir Thermography and Possible Implications for the Prediction of Reservoir Conditions
Legacy and pseudo-temperature data from major Texaco assets in California have been used to calculate 4-13 textural and graphical models used to infer past thermal reservoir conditions. Data for such calculations come from two sources. Primarily, legacy temperature data, recorded periodically in designated temperature wells over the past decade, reside in corporate databases. Secondly, pseudotemperature data are calculated from porosity well-logs from varying vintage wells. Typical Texaco workflow allows that asset teams build multiple temperature models from the observed or calculated temperature data, using Texaco's integrated 3-D numedcal modeling toolbox. These models are then visualized and analyzed as time-dependent textural representations, as movies, and graphical representations, as cross-plots with up to 6 dimensions. In addition to the improved intuition of the petroscientists managing the thermally enhanced reservoir, this style of analysis allows workers to establish temporal and spatial thermal reservoir trends in a quantitative sense. Furthermore, these analyses have been used to establish valuable relationships between steam-injection rates and the thermal character of the reservoir such as empirical relationships between steam injection and fluid displacement. Moreover, these relationships have been used to infer temperature conditions at specific past and future time periods to within ~3% error.
AAPG Search and Discovery Article #90920©1999 AAPG Pacific Section Meeting, Monterey, California