Peculiarities of the anomalous magnetic field in the areas of hydrocarbon fields in the Carpathian foredeep

2014;
pp. 125-138
Received: November 20, 2014
1
Carpathian Branch of Subbotin Institute of Geophysics of the NAS of Ukraine
2
Carpathian branch of S. I. Subbotin name Institute of geophysics of NAS of Ukraine; Institute of Geophysics National Academy of sciences of Ukraine
3
Carpathian branch of S. I. Subbotin name Institute of geophysics of NAS of Ukraine
4
Carpathian Branch of Subbotin Institute of Geophysics of NAS of Ukraine

Purpose. Identifying of anomalous magnetic field peculiarities upon oil-and-gas bearing structures in the Carpathian Feoredeep and its relationships with oil and gas deposits. Methodology. Measuring of geomagnetic field T total vector modulus during surface magnetic survey on a geomagnetic profiles network. Measuring of core magnetic susceptibility of searching-prospecting wells. Investigations were done for 9 hydrocarbon deposits and 6 perspective structures in the NW part of Bilche-Volytsa zone, Carpathian Foredeep. Results. The analysis of anomalous magnetic field is shown. The new results about features of local anomalous field in the NW part of Bilche-Volytsa zone were obtained. On the background of regional geomagnetic field component were stated local magnetic anomalies (– 10 to + 10 nT amplitude and 2 – 5 km width) of complex morphology and correlation with tectonic-shielded hydrocarbon traps in siltstone-sandstone layer of Dashava formation. Was stated vertical variability of rocks magnetic susceptibility in sedimentary cover of the Carpathian Foredeep. Sources of local magnetic anomalies located on the shallow depth (a few hundred meters) and are presented as heterogeneities, generated during epigenetic changes as hydrocarbon fluids infiltrates up to the surface. The area in the NW part of Carpathian foredeep Outer zone is favorable for magnetic investigations in total. Originality. On the base of hydrocarbon anomalous magnetic field structure analysis in the NW part of the Carpathian Foredeep were stated four types of local magnetic anomalies, related with prospected areas of hydrocarbon deposits. Practical significance. Results of magnetic-prospecting investigations can be used for creation of complex geophysical models of hydrocarbon deposits and perspective hydrocarbon structures during their preparation for searching and prospecting drilling in the NW part of Carpathian Foredeep’s Outer zone.

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