GEOCHEMICAL EXPLORATION METHOD Russian patent published in 2012 - IPC G01V9/00 

FIELD: oil and gas industry.

SUBSTANCE: water area relief survey is performed. Flooded river valleys crossing the continental shelf are determined as per survey results. Bottom deposits are explored with acoustic pulses. Layers of soil and bottom deposits are restored to depths of up to 2-4 km. Structural denudation relief shapes are analysed and terrigenous deposits are determined. When prerequisites of existing oil-gas sections are being determined, soil is sounded with coherent pulse protonic spin echo. Tomographic restoration of image of explored geological soil profile is performed on the level of prismatic crystals. At least two bottom seismic stations are installed in addition to record and analyse microseismic waves. Soil resistance and friction coefficients as per which its strength characteristics are determined are defined by means of penetrometers arranged on the above seismic stations. After that, samples of mine rock and plants along water courses are taken. Samples of mine rocks are separated into two fractions - more than 0.1 mm and less than 0.1 mm. The first fraction is analysed for content of Si, Al, Ti, Y, and the second one - for Hg content. Samples of plants are analysed for content of Ba, Cu, Pb, Zn, and Ag. Analysis results of fractions of more than 0.1 mm and samples of plants are recalculated for the corresponding additive characteristics of use concentrations. Distribution charts of the above additive characteristics and Hg are built. Objects characterised by distribution of anomalous values of additive characteristics and Hg are identified in the row of Si, Al, Ti, Y - Ba, Cu, Pb, Zn, Ag - Hg - Ba, Cu, Pb, Zn, Ag - Si, Al, Ti, Y, with oil-gas perspective sections. Water layer is analysed for methane content. Coordinates of gas formation are determined. When overflows of the transported liquid product with formation of oil spot are determined, oil spreading and transfer processes are calculated considering hydrodynamic parameters of water environment.

EFFECT: enlarging functional capabilities of the method; improving detection reliability of perspective oil-gas sections.

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