Geophysical borehole exploration is a part of a complex of measures aimed to define the qualitative and quantitative characteristics of oil, gas or water deposits in particular region. The traditional understanding of GBE (geophysical borehole exploration) has managed to transform into a huge branch of geophysics. In a broader sense, borehole drilling exploration results are not only represented by documents, depicting the area of a couple of square meters, but also with details on the composition and particular feature of the surrounding area within tens or hundreds of meters. The intensive use of borehole exploration techniques allowed achieving better results in site organization and exploitation of the natural deposits. Thus, the borehole exploration contributes to a sharp reduction in sampling during drilling, providing the drilling company with comprehensive data on the area, as well as reducing operational expenses.
Borehole exploration in practice
The borehole exploration methods are designed to study the geological section and identify the layers of different lithology in particular, determine the angles and azimuths of their fall, the deposit of minerals in the profiles and estimate porosity, permeability and reservoir properties of the surrounding rocks and their possible oil and gas production. A technical inspection of a borehole is carried out via special equipment (used to define the diameter, curvature, the presence of cement in the annulus and etc.), as well as walls sampling, casing perforation and so on. The physical properties of rocks, defined as a result of research in boreholes, serve to obtain the particular geological information directly.
The efficiency of borehole exploration is fairly considered to be very high, especially in oil and structural geology, where borehole drilling is followed by geophysical surveys. The methods are widely applied in the search for metallic and non-metallic minerals.