Thermal Conductivity Estimation Based on Well Logging

Abstract

The thermal conductivity of a stratum is a key factor to study the deep temperature distribution and the thermal structure of the basin. A huge expense of core sampling from boreholes, especially in offshore areas, makes it expensive to directly test stratum samples. Therefore, the use of well logging (the gamma-ray, the neutron porosity, and the temperature) to estimate the thermal conductivity of the samples obtained from boreholes could be a good alternative. In this study, we measured the thermal conductivity of 72 samples obtained from an offshore area as references. When the stratum is considered to be a shale–sand–fluid model, the thermal conductivity can be calculated based on the mixing models (the geometric mean and the square root mean). The contents of the shale and the sand were derived from the natural gamma-ray logs, and the content of the fluid (porosity) was derived from the neutron porosity logs. The temperature corrections of the thermal conductivity were performed for the solid component and the fluid component separately. By comparing with the measured data, the thermal conductivity predicted based on the square root model showed good consistency. This technique is low-cost and has great potential to be used as an application method to obtain the thermal conductivity for geothermal research.

Shear-horizontal transverse-electric seismoelectric waves in cylindrical double layer porous media*

“…The parameters of the layered porous medium are given in Table 1, they are the typical sandstone parameters. [4,16] In addition, the fluid density in the borehole is 1000 kg/m 3 , and the salinity is 0.01 Mol/L. The central frequency of the acoustic source is 10 kHz.…”

“…This is consistent with the interface response characteristics of the borehole seismoelectric coupling wave fields excited by a point acoustic source. [3][4][5] After the interface responses a-a and b-b, the electric field component c-c is the accompanying electric field of the SH wave. The electric field component d-d is the accompanying electric field of the multi-mode Love waves.…”

“…The electric field component d-d is the accompanying electric field of the multi-mode Love waves. Since the propagating velocity of the accompanying electric fields of the Love waves are the same as the Love wave velocities, [3,4,25] the dis-014301-4 persion law for them is also the same. The dispersion characteristics of the Love waves in a cylindrical layered porous medium can refer to Ref.…”

“…[2] Thus, the application prospect of the method in deep reservoir exploration is better. Hu et al [3,4] carried out the earliest seismoelertric effect logging simulation. They discovered the electromagnetic head waves propagating at the formation electromagnetic wave velocity, which are independent of the acoustic field and reach the receivers almost simultaneously.…”

Thermal Conductivity of Sediments from Well-Logs and its Application to Determine Heat Flow Density in the Pannonian Basin, Hungary

“…This composition together with component thermal conductivity values is then used to compute the bulk thermal conductivity assuming an appropriate mixing law (e.g. Brigaud et al, 1990;Demongodin et al, 1991;Hartmann et al, 2005;Fuchs et al, 2013;Hu et al, 2021).…”