Research
Although it was expected that there would be a pronounced boundary between granites and basalts, only granites were found in the core throughout the depth. However, due to the high pressure and elevated temperature, the physical properties of granites greatly changed.
As a rule, the lifted core scattered from active gas release into the cuttings, as it could not withstand a sharp change in pressure. It was possible to take out a solid piece of core only with a very slow ascent of the drill, when the "excess" gas, while still being compressed to high pressure, managed to escape from the rock.
The density of cracks at great depths, contrary to expectations, increased. There was also water at depth, filling the cracks.
Researchers have identified 12 levels in the well, distinguished by their physical properties. Deeper levels generally had higher isotropy (uniformity). At the middle levels, high anisotropy suggested the tectonic activity of the layers.
Although in the process of research a lot of valuable information about the earth's interior was obtained, the results were largely unexpected, and on their basis there was no clear understanding of the nature of the earth's mantle and the essence of the Mohorovichich surface.
At a depth of five kilometers, the ambient temperature exceeded 70 ° C, at seven - 120 ° C, and at a depth of 12 kilometers, sensors recorded 212 ° C