--> Abstract: Thermal Conditions in the Anadarko Basin, Oklahoma, by S. A. Kelley, J. D. Gallardo, L. C. Carter, and D. D. Blackwell; #91004 (1991)
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Thermal Conditions in the Anadarko Basin, Oklahoma

KELLEY, SHARI A., JAQUIDON D. GALLARDO, LARRY C. CARTER, and DAVID D. BLACKWELL, Southern Methodist University, Dallas, TX

Heat flow, bottom-hole temperature (BHT), and thermal conductivity data are used to evaluate the present thermal conditions in the Anadarko basin. Heat flow values decrease from 54-62 mWm(2) in the northern part of the basin to 39-53 mWm(2) in the southern portion of the basin. The variation in the regional conductive heat flow is controlled by basin geometry and by the distribution of radiogenic elements in the basement. The heat flow, thermal conductivity, and lithologic information were combined to construct a Previous Hit3-DNext Hit model of the temperature structure of the Anadarko basin. The highest temperatures in sedimentary rocks older than Pennsylvanian are offset 35 km north-northwest of the deepest part of the basin. This offset is related to the regional increase in heat flow to the north an to the presence of high thermal conductivity granite wash adjacent to the Wichita Mountains. A plot of the temperature difference between the equilibrium temperatures estimated from the model and the measured BHTs as a function of depth is remarkably similar to the published Previous HitcorrectionTop curve for BHTs for wells in Oklahoma.

Vitrinite reflectance and apatite fission-track (FT) data are used to estimate the paleogeothermal conditions in the basin. Published vitrinite reflectance values are consistent with a past geographic temperature distribution comparable to the observed distribution with the maximum values offset from the basin axis. FT analysis of sandstones from wells in the southeastern portion of the basin indicates that subsurface temperatures were at least 30 degrees C higher than at present, suggesting the possibility of substantial erosion in this area.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)