Identification of local hydrocarbon saturation zones in the upper part of a section (UPS)

In areas of existing oilfield facilities in the upper part of the section, local hydrocarbon saturation zones are often formed due to the degassing of secondary hydrocarbon accumulations, deforestation of gas hydrates and hydrocarbon flows along the annulus of wells. Besides, the first of them are formed due to vertical migration of hydrocarbons from the lower-lying accumulations along tectonically weakened zones, active snaps and cleavages confined to them, karst cavities and caverns. The activation of vertical mass transfer of deposit components in the deep snap zone, due to violation of tightness of overlapping deposits, is accompanied by the formation of high-contrast anomalies in near-surface deposits with “hurricane” concentrations of hydrocarbon components, helium, carbon dioxide, hydrogen, bitumen and physical and chemical properties of rocks and waters.

A detailed geochemical survey including luminescent-bituminological, hydrochemical, litho-gas, and geochemical testing of near-surface sediments and water manifestations, using archive materials of gas (bitumen) logging of deep wells, is used as a mapping method for the zones of “secondary” oil and gas manifestations and hidden discharge foci of deep fluids.

Geochemical work is carried out in 2D, 3D modifications, and in the form of 4D monitoring independently or in combination with shallow modified near-field time-domain electromagnetic sounding to specify locations of deep exploration or production wells, forecast drilling conditions and reduce risks.

The company has accumulated extensive experience in environmental and geochemical research to identify and delineate the zones of development of oil and gas habitat and their hidden discharge foci, to forecast development zones and unfavorable mining and geological conditions in UPS in the regions of Eastern Siberia and the Far East. The optimal performance technique has been developed and positive results have been obtained.

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