DBPapers
DOI: 10.5593/SGEM2016/HB14/S01.010

COMPARISON OF TECTONIC STRUCTURES IN CORES AND XRMI LOGS: CASE STUDY FROM THE BALTIC BASIN (POLAND)

B. Liana, G. Zabek
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-80-3 / ISSN 1314-2704, 2 - 5 November, 2016, Book 1 Vol. 4, 73-80pp, DOI: 10.5593/SGEM2016/HB14/S01.010

ABSTRACT

Efficient exploitation of unconventional oil and gas resources requires an extensive knowledge of the natural structures present in the reservoir. Such structures provide information about stress orientation and natural fracture network which are crucial during hydraulic fracturing treatments designing. The X-tended Range Micro Imager (XRMI) tool was used to obtain microresistivity image of wellbore walls which allowed to interpret natural and drilling-induced structures. Most observations concerned natural fractures, small dislocations and calcite/pyrite concretions, also breakouts structures and induced tensile fractures were recorded. Structural analysis of the cores gave an opportunity to examine naturally occurring tectonic structures, including veins and fractures beyond the resolution of XRMI tool. Structure description included genetic type, dip angle, size and mineral filling. Paper presents interpretation of borehole imaging and cores analysis for two wells located in the Baltic Basin, which is a subject of extended unconventional oil and gas exploration. Qualitative and quantitative comparison of structures observed was carried out. The results obtained from the applied methods showed, that the core analysis enabled recognition of more structures than the XRMI logging.

Keywords: Baltic Basin, fracture network, XRMI, structural analysis, borehole core

PAPER DOI: 10.5593/SGEM2016/HB14/S01.010, COMPARISON OF TECTONIC STRUCTURES IN CORES AND XRMI LOGS: CASE STUDY FROM THE BALTIC BASIN (POLAND)

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