Evaluation of oil and gas prospects in ancient artesian basins, from solution gases in formation waters

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Abstract
Expressions of accumulations of hydrocarbons are sought and presumptively determined in aquifers of the central Russian artesian basin, against the determined regional background (dissolved CH4 and heavy hydrocarbons). Both the background and the anomalies are found to be significantly weaker than in the much younger, but otherwise comparable basins, inasmuch as qualitative composition and partial pressures of the dissolved gas are influenced markedly by the geological time. Calculations of the background are contingent upon the following basic data, in addition to the gas analysis: the epeirogenic profile of the basin, stability of the structural plan (essentially unchanged since the early Mesozoic, in the central Russian artesian basin); rates of movement of the formation waters and the possible distance of the diffusion of hydrocarbons from the hypothetical target (counter-current, along the current, and perpendicular to the current). The modern and the original size of the prospecting target (anomaly) are calculated on the basis of theoretically derived equations for solubility and diffusion rates of methane, under certain conditons. – IGR Staff.

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