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DISTRIBUTIONS OF LIGHT HYDROCARBONS IN THE NEAR SURFACE ZONE OF THE MARGINAL PART OF THE CARPATHIAN FOREDEEP AND OUTER CARPATHIANS - CASE STUDY FROM SE POLAND
Abstract
The paper presents the results of surface geochemical surveys carried out using "free gas method" in "Brzesko-Wojnicz" area in the SE part of the Poland. The surveys were conducted along 2 measurement profiles. A total of 341 soil gas samples were collected from 1.2 m depth below the surface. Maximum concentrations of CH4, total alkanes C2- C5, total alkenes C2-C4 reached: 27,1 vol.%., 45,3 ppm and 0,174 ppm, respectively. In total, in the analyzed area there are anomalous concentration of total C2-C5 alkanes (over 3? above calculated background mean) in 121 measurement points, comprising 9 zones ranging from 200 m to a 2 kilometres. Calculated hydrocarbon ratios CH4/?C2-C5 (C1/?C2-C5) and C2H6/C3H8 (C2/C3) allow to define the presence of compositionally diversified, deep hydrocarbon accumulations. The statistical parameters and histogram distributions of the above-mentioned ratios show dominance of condensate-oil character of deep-seated sources with the presence, in some samples, of the effects of current biochemical processes. The highest number of anomalies of total alkanes C2-C5 was determined over the Wojnicz thrust slice, particularly in the area of significant increase in thickness of autochthonous miocene sediments. The Wojnicz thrust slice is bordered to the south by the D?bno thrust slice, over where a decay of anomalous indications of total alkanes C2- C5 was observed. Besides, the thrust fault zone of this thrust slice collectively with the marginal part of the Outer Carpathian may create barriers to the potential migration and microseepage of hydrocarbons from deeper miocene horizons and from flysch sediments. The conducted analysis indicates that the number and distribution of surface geochemical anomalies point to the possibility of the occurrence of deep-seated accumulations, but the penetration of gas ingredients to the surface is determined predominantly by the tectonics of the area.
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References11
Klusman R.W., Soil Gas and Related Methods for Natural Resource Exploration, John Wiley & Sons, New York, pp 1-483, 1993.
Kirchner Z., Połtowicz S., Geological structure of the area between Brzesko and Wojnicz, Rocznik Polskiego Towarzystwa Geologicznego, vol. 44/issue 2-3, pp 293-320, 1974. [in Polish]
Jawor E., Kotarba M.J., Genesis of natural gas accumulated in Paleozoic/Mesozoic formations of Miocene subsoil in western and central parts of Carpathian Foredeep: Geologic and isotopic interpretation, Nafta, vol XLVII/issue 10-12, pp 149-155, 1991. [in Polish]
Marzec P., Sechman H., Kasperska M., Cichostępski K., Guzy P., Pietsch K. & Porębski S., Interpretation of gas chimney in the Polish Carpathian Foredeep based on integrated seismic and geochemical data, Basin Research, pp 1-18, DOI: 10.1111/bre.12216, 2016.
Dzieniewicz M., Sechman H., Design of a Driving Rod for Soil Studies, Utility Model No. 58584, WUP, 05/2001. [in Polish]
Dzieniewicz M., Sechman H., Tool Kit for Manual Gas Sampling of Near-surface Soil Horizons. Patent No. PL 184080 B1, WUP, 08/2002. [in Polish]
Sechman H., Detailed compositional analysis of hydrocarbons in soil gases above multi-horizon petroleum deposits – a case study from western Poland, Applied Geochemistry, vol. 27/issue 10, pp 2130-2147, 2012.
Nikanov V.F., Distribution of methane homologs in gas and oil fields, Akademija Nauk SSSR Doklady, vol. 206, pp 234-246, 1971. [in Russian]
Jones V.T., Matthews M.D., Richers D.M., Light hydrocarbons for petroleum and gas prospecting, in: Hale M. (Ed.), Handbook of Exploration Geochemistry, Elsevier Science Publishers, vol.7, pp 133-212, 2000.
Sechman H., Dzieniewicz M., The example of background determination and mathematical processing of data from surface geochemical survey for the purposes of petroleum exploration, Journal of Petroleum Science and Engineering, vol.78/issue 2, pp 396-406, 2011.
Guzy P., Twaróg A., Sechman H., Dzieniewicz M., Initial analysis of the results of surface geochemical surveys in Krosno-Besko area, in: Geopetrol 2016: Cooperation of science and industry in hydrocarbon exploration and production, vol. 209, pp 135-136, 2016. [in Polish]
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