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

Góra, Adrianna

doi:10.5593/sgem2017/14/s06.076

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“…The highest number of such anomalous concentrations occurs over the Wojnicz slice, particularly over the area of the so-called "Wojnicz Graben" where the bottom surface of the Miocene suite is much depressed (see Figure 9) and where the thickness of autochthonous Miocene formation increases (see Figure 10). Such distribution may suggest relatively high "hydrocarbon potential" of a part of this area [67]. The Wojnicz Graben is bordered on the south by the Figure 10: Variations in soil gas geochemistry along the E-E′ seismic profile (see the location in Figures 1(b) and 9).…”

Section: Geofluidsmentioning

confidence: 99%

Near-Surface Geochemical Anomalies Integrated with Seismic and Well Data over the Contact of the Outer Carpathians and the Carpathian Foredeep (SE Poland)

et al. 2018

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The objective of this study is to interpret the regularities in distribution of surface geochemical anomalies observed in a fragment of the contact zone between the Carpathian Fold-and-Thrust Belt and the Carpathian Foredeep (SE Poland). The surface geochemical survey included a total of 670 soil gas samples analyzed by gas chromatography, integrated with seismic cross sections, and supplemented by production data from wells. Maximum concentrations of methane, total alkanes C 2 -C 5 , total alkenes C 2 -C 4 , H 2 , and CO 2 measured in soil gas samples were 27.1 vol.%, 45.3 ppm, 0.49 ppm, 0.232 vol.%, and 6.29 vol.%, respectively. Traces of alkanes detected in samples are the result of microseepage from a few accumulations of various compositions. Methane and ethane migrate primarily from relative shallow Miocene strata, and higher alkanes from deeper Miocene strata and from Paleozoic-Mesozoic basement. We found relatively high positive correlation between the distribution of surface geochemical anomalies and the relative intensity of hydrocarbon shows recorded in the wells. The location and range of 13 anomalous zones are controlled by the patterns of both the Dębno and the Wojnicz slice-folds. Most of the anomalies occur over the Wojnicz Trough, suggesting the presence of conventional accumulations and/or the sites where the Miocene mudstone and heterolithic formations are saturated with gas.

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Section: Geofluidsmentioning

confidence: 99%