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Improved recognition of rock formation on the basis of well logging and laboratory experiments results using factor analysis

Puskarczyk Edyta, Jarzyna Jadwiga A., Wawrzyniak-Guz Kamila, Krakowska Paulina I., Zych Marcin

Acta Geophysica

2019

Vol. 67, no. 6

1809--1822

Several data sets from the Silurian and Ordovician formations from three wells on the shore of Baltic Basin in Northern Poland prepared on the basis of well logging data and results of their comprehensive interpretation were used in factor analysis. The goal of statistical analysis was structure recognition of data and proper selection of parameters to limit the number of variables in study. The top priority of research was recognition of specific features of claystone/mudstone formations predisposing them to be potential shale gas deposits. The identified data scheme based on data from one well, was then applied to: 1) well 2 and well 3 separately, 2) combined data from three wells, 3) depth intervals treated as sweet spots, i.e., formations of high hydrocarbon potential. Numbers of samples from well logging were proportional to number of laboratory data from individual formations. The extended data set comprising all available log samples in explored formations was also prepared. Outcomes from standard (Triple Combo—natural gamma log, resistivity log, neutron log and bulk density log and Quad Combo—with addition of sonic log and spectral gamma log) and sophisticated (GEM™—Elemental Analysis Tool, Wave Sonic and Nuclear Magnetic Resonance—NMR) logs were the basis for data sets. Finally, laboratory data set of huge amount of variables from elemental, mineralogical, geochemical and petrophysical laboratory experiments was built and verified in FA to select the most informative components. Conclusions on the data set size, number of factors and type of variables were drawn.

Learning through questioning in occupational health and safety

Paas Õ, Reinhold K., Tint P.

Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie

2015

Nr 67

69--85

The safety management system in 16 Estonian enterprises was analysed using the MISHA method. The statistical analysis was conducted for the interpretation of the results on health and safety level in OHSAS 18001 certified and non-certified enterprises. A new learning package “training through the questionnaires” has been worked out for the top and middle managers’ to improve their safety knowledge, where the MISHA questionnaire has been taken as the basis. The tool assists SMEs with health and safety requirements according to the legislation, good practices and tacit knowledge.

W ramach artykułu przeanalizowano System Zarządzania Bezpieczeństwem 16 estońskich przedsiębiorstw przy użyciu metody Misha. Analizę statystyczną przeprowadzono dla wyników dotyczących zdrowia i poziomu bezpieczeństwa w systemie OHSAS 18001 w certyfikowanych i niecertyfikowanych przedsiębiorstwach. Nowy sposób nauczania „szkolenia z kwestionariuszy” został opracowany przez kierownictwo wyższego i średniego szczebla zarządzania w celu poszerzenia wiedzy w zakresie bezpieczeństwa. Podstawę stanowił kwestionariusz MISHA. Narzędzie to pomaga MŚP spełniać wymagania dotyczące bezpieczeństwa i ochrony zdrowia zgodnie z przepisami, dobrymi praktykami oraz przy wykorzystaniu wiedzy ukrytej.

Preservation of magmatic signals in metavolcanics from Wedel Jarlsberg Land, SW Svalbard

Gołuchowska K., Barker A. K., Majka J., Manecki M., Czerny J., Bazarnik J.

Mineralogia

2012

Vol. 43, iss. 3/4

179--197

The purpose of this study is to determine the role of metamorphism and thereby identify the preserved magmatic signature in metavolcanics from Wedel Jarlsberg Land in southwestern Svalbard. Samples have been collected from late Precambrian metavolcanics occurring within metasedimentary rocks of the Sofiebogen Group, as well as dikes cutting older metasedimentary rocks of the Deilegga Group. The volcanic rocks were metamorphosed under greenschist facies conditions during the Caledonian Orogeny. To investigate the role of metamorphism, we present petrography, major and trace element geochemistry, and use factor analysis as a tool to identify correlations that correspond to primary magmatic signals. The metavolcanics are classified as subalkaline basalt to basaltic andesite and they contain relicts of primary clinopyroxene and plagioclase. The metamorphic minerals are actinolite, secondary plagioclase, chlorite and minerals belonging to the epidote group. Major element variations are highly scattered with no obvious trends observed. The HFSE and REE show strong trends attributed to fractional crystallization. The LILE, Th and La show elevated contents in some samples. Factor analysis shows that the HFSE and REE are well correlated. The LILE form a separate well correlated group, while the major elements are not correlated, except for Na2O, Fe2O3 and CaO. The lack of correlation for major elements, as well as the lack of observed fractional crystallization trends between these elements suggests that they were modified by metamorphism. The strong correlation of HFSE and REE reflects the original geochemical signal generated by magmatic processes. The correlation of the LILE is consistent with their elevated composition implying the influence of crustal contamination processes, and though some variability is likely superimposed due to metamorphism, the primary magmatic record is not completely destroyed. We conclude that the HFSE and REE are not influenced by metamorphic processes and therefore provide robust records of magmatic processes.