STUDY ON SOME IMPORTANT PROBLEMS OF GEOTHERMAL FIELD SIMULATION OF BASINS

Geothermal field simulation is the basis of basin modeling.This paper probes into some difficult problems about geothermal field simulation of basins and their solving method:(1) From the angle of equilibrum and wreck of underground thermal state,the authors adopt the concepts of normal geothermal field and appended geothermal field to describe the contribution of normal crust mantle convection to the geothermal field and the contribution of magmatic intrusion to geothermal field respectively;(2) The authors try to discuss the method of gaining the thermal flow value about basin bottom,that by using analyzing paleo geothermal structure,and also try to discuss the availability of empirical formula for burial depth of Moho surface which is established on the basis of the relationship of inverted image between basin bottom and Moho surface in gravity compensated area;and (3) Based on the relation curve among thermal conductivity,lithologic characters and earth temperature provided by Ungerer etc,the authors establish an empirical formula about the thermal conductivity of rock through double regression.These methods have been applied to simulation of thermal field of several basins.