Effect of deposition rate on geothermal field in Bozhong depression, Bohai Bay Basin

Thermal anomalies can be caused by fast and intensive tectonism in sedimentary basins. And the thermal anomalies should be eliminated when the thermal history is used to provide continuous information on time and space for the geodynamic process at depths. In this paper, based on the dynamic-instantaneous heat conduction theory in solid, geothermal correction of 3 typical wells in Bozhong depression has been modeled. The results indicate that the rapid subsidence in Bozhong depression which started at Paleogene leads to the present geothermal disequilibrium. The average heat flow at present is about 60. 9 mW . m(-2), a higher heat flow 67. 4 mW . m(-2) can be obtained when the geothermal field is on the condition of geothermal equilibrium. The average thermal lithosphere thickness in Bozhong depression is about 70 km, calculated by using the corrected heat flow, which is 13 similar to 28 km thinner than before (82 similar to 100 km). The result is consistent with the lithosphere thickness obtained from geophysics and xenoliths.