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RESULTS OF SURFACE GEOCHEMICHAL SURVEY IN THE AREA OF MOLODYCZ GAS DEPOSIT IN THE CARPATHIAN FOREDEEP (SE POLAND)
Abstract
Surface geochemical method is an important technique in petroleum exploration. The purpose of this method is to record and analyze the distribution of micro-concentration of gaseous hydrocarbons, which migrate from subsurface accumulations to the near-surface zone. The paper presents the results of surface geochemical survey carried out in the area of the Mo?odycz gas deposit of the Carpathian Foredeep. A soil-gas geochemical survey was carried out along the six sampling lines corresponding to the seismic section. A total of 192 soil gas samples were collected from 1.2 m depth below the surface and then analyzed chromatographically. The maximum concentration of CH4, total alkanes C2-C4, total alkenes C2-C4 reached: 369.1 ppm, 3.5 ppm and 4.6 ppm, respectively. Based on the concentrations measured in the soil gas the C2H6/C3H8 (C2/C3) ratio was calculated, which allowed to evaluate the character of deep hydrocarbon accumulations. The statistical parameters, histogram distribution and scatter-plots of ethane versus propane concentrations shown dominance signals characteristic for gas-condensate accumulations. Moreover, normalized and filtered values of the total alkanes C2-C4 concentrations were drawn against structural map of the gas horizon of the Miocene strata. Anomalous concentrations of total alkanes C2-C5 were found in 11 zones. These zones were the effect of the migration from sources located at various depths. Such a comparison demonstrated also that hydrocarbon accumulations can be expected outside the known contours of the gas deposit. Results of surface geochemical survey combined with the geological studies and geophysical surveys provide a valuable source of comprehensive information about the explored area and can be a new perspective for exploration in a hydrocarbon provinces.
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