I wanted to thanks everyone for their comments but I believe I found what I needed online when someone suggest that I have a look at the term "Thermal conductivity"
Table T6. Thermal conductivity of water and sediment types (Beaumont and Keen, 1990). Material Water Shale Limestone Sandstone
Thermal conductivity (W/[m·K]) 0.61 1.13 2.929 4.184
thanks for your help
ZX
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