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Porównanie interpretacji obrazowania ścian otworu wiertniczego za pomocą sondy XRMI z wynikami strukturalnej analizy rdzeni wiertniczych

Liana B., Ząbek G.

Prace Naukowe Instytutu Nafty i Gazu

2016

nr 209 wyd. konferencyjne

169--172

Obrazowanie ścian otworu wiertniczego przy wykorzystaniu imagera mikroopornościowego (XRMI) umożliwia lokalizację elementów strukturalnych, takich jak szczeliny naturalne oraz indukowane czy strefy uskokowe, a także określenie ich przestrzennej orientacji. Analiza strukturalna rdzeni wiertniczych pozwala na obserwację struktur bezpośrednio występujących w skale. Dodatkowo umożliwia badania mineralogiczno-geochemiczne wypełnienia szczelin oraz ocenę parametrów hydraulicznych szczelin. Praca przedstawia wady i zalety stosowania wymienionych metod analizy strukturalnej w obrębie otworu wiertniczego, a także opis integracji obydwu metod.

Visualization of wellbore walls using X-tended Range Micro Imager Tool (XRMI) allows to identify structural elements such as natural and induced fractures, fault zones and to define spatial orientation of this structures. Structural analysis of cores enable observations of structures occured directly in rock formation. Additionally, it is possible to perform mineralogical and geochemical analysis of fracture filling and hydraulic conductivity evaluation based on core samples. Paper presents advantages and disadvantages of using mentioned methods of structural analysis in wellbore and also a description of integration of these.

Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic

Hladilová Š., Nehyba S., Zágoršek K., Tomanová-Petrová P., Bitner M. A., Demeny A.

Annales Societatis Geologorum Poloniae

2014

Vol. 84, No. 3

259--279

This multidisciplinary study, based on borehole cores from the Hluchov area in Czech Republic, documents an early Badenian marine transgression on the outer flank of the Western Carpathian Foredeep. The shallow-marine deposits represent coastal transgression over a terrestrial topography of weathered pre-Cenozoic bedrock. The lower facies association (FA1) consists of siliciclastic sediment derived from local substrate erosion. Facies indicate a wave-dominated environment with unstable bottom, variable rate of sediment supply and an incremental rise of relative sea level. The upper facies association (FA2) consists of carbonates indicating a major landward shift of shoreline, decline in siliciclastic input and further sea-level rise. The succession represents a transgressive to highstand systems tract. The maximum flooding surface, ca. 1 m above the FA1/FA2 boundary, is signified by an anomalous decrease in K and Th, an increased Th/K ratio and highest U concentration. The heavy-mineral assemblages in FA1 confirm local sediment provenance, whereas those in FA2 indicate broader sediment derivation, including volcanic component from contemporaneous rhyolitic to rhyodacitic eruptions. The deposits contain a wide range of marine fauna, with the foraminifers and molluscs indicating an early Badenian age. Molluscs, bryozoans and echinoderms indicate a normal-salinity environment with a decreasing hydraulic energy. Foraminifers indicate salinity fluctuations in the lowest part of the succession. The isotopic composition of mollusc shells shows marked inter-species differences and a general negative shift in the δ13C and δ18O values, indicating diagenetic alteration. The impact of diagenetic processes appears to have been controlled by sedimentary facies. The highly negative δ13C and δ18O values correspond to sediment layers with the highest Th/K ratios and hence low clay content. Sediment permeability was thus probably crucial in controlling the differential circulation and impact of diagenetic fluids.