Problems and Potential of Industrial Temperature Data from a Cratonic Basin Environment

摘要: A thin veneer of clastic and carbonate sediments 460–1,375 m (1,500–4,500 ft) thick overlies a Precambrian crystalline basement complex in southeastern Kansas (Midcontinent, USA). Well-log temperatures were analyzed related to modeled for different-size areas relatively simple structural setting the shallow, cratonic Cherokee Basin. statistical analysis bottom-hole (BHTs) confirmed that (1) there is no significant change temperature with season or through 40 years drilling logging wells area; (2) distribution values normal indicating they recorded correctly on rig within instrumental precision about 1 K. It was obvious from large data set nonequilibrium BHTs by depth stratigraphic unit differed drillstem test (DSTs) temperature- distributions based heat conduction. At shallow (less than 500 m), BHT as read logs are higher ‘true’ formation temperature; range 500–700 m, scatter around at greater depths (up 1,100 uncorrected slightly underestimate temperature. Different amounts composite BHT-depth plots occur different size areas, which also impacts calculated geothermal gradients empirical correction methods developed basis these data. Although 60×75 km area Elk Chautauqua counties ±5–9°C some mean value, seemingly can be reduced when working smaller example 10×10 km. mapping approach made investigate variability 60×75-km cluster more detail showed part regional geology. Temperature residuals trend order ±2.5°C ±7.5°C. This provides an indication resulting other influences, might perturbations result practices shut-in times wells. In addition, highs shown local, subtle anticlines sedimentary cover over faulted blocks therefore contain signal. The separation effects has implications reliability gradient heat-flow density estimations.