The first stage is called search. First, looking for promising areas – traps. To do this, huge areas are
surveyed by the most cutting-edge methods: they are photographed from space, they are translucent by
seismic waves, and are listened by special instruments.
Specialists make maps and draw geological sections of the earth's crust, on which the bends of the
layers in the subsoil become visible. If something resembling a potential hydrocarbon trap under the
ground is found, then the second stage of work is begun – field exploration.
At the first stage, geological and geophysical studies are carried out in a large volume; reference,
parametric and exploratory wells are drilled.
At the second stage, exploratory wells are drilled and, with the help of drilling, they find out whether
there is oil or gas at depth, and if so, how many. And only after they have determined the size of the
field and decided that it is quite profitable, they will begin to develop it.