Geochemical prospecting for oil and gas deposits is based on the determination of hydrocarbon-gas content in soil air or in rock samples. The biogeochemical method is based on the study of the chemical composition of plants, generally by means of preliminary ashing and subsequent spectral analysis.Geophysical prospecting is the study of the structure of the earth's crust by physical methods for the location and surveying of minerals and ores. It is an integral part of geophysics.To determine lithology of the area. To identify and locate exploitable reservoirs.