Rock thermal properties and heat flow in the vicinity of drilling Yen-Yakhinsk super-deep borehole
The authors present the results of the experimental investigations of thermal conductivity, diffusivity, volumetric heat capacity, thermal anisotropy coefficient and porosity of rocks stripped by drilling of Yen-Yakhinsk SG-7 ultradeep borehole. The measurements of 449 dry and water-saturated core samples have resulted in detecting the substantial vertical variations of the above parameters and defining the ranges of their alterations. It is shown that rock jointing can be determined by the components of thermal conductivity tensor for dry and water-saturated rocks. The thermalphysic characteristics for series and strata dissected by SG-7 borehole are determined. The density of heat flow is estimated. It is exceeds the previous heat flow data by 30%. It is shown that the new heat flow data should greatly influence the forecast of thermal conditions and estimation of the conditions governing the hydrocarbon formation on the area where drilling is being peformed.