Correlation of the Rotliegend strata in Central Poland based on the interpretation of well logging data

Jadwiga Jarzyna, Maria Bała, Barbara Czopek, Natalia Górecka

Abstract


Comprehensive interpretation of well logging data, based on selected set of borehole geophysical measurements, enabled the determination of lithology and porosity of the Rotliegend strata. The detailed lithological subdivision and calculation of porosity values have been made on the basis of well logs with the use of the domestic GEO computer program. The subdivisions of the studied rock sequences into porous and sealing series will allow to determine the exact thicknesses of reservoir layers and their average porosity. The results of comprehensive interpretation of lithology on the basis of well logging data are more reliable in comparison to a qualitative appraisal, inferred from apparent values, recorded during measurements in wells. The generalized complexes (“series”) have been correlated along selected profiles. Correlations along longitudinal profiles (concordant with the NW-SE axis of the basin) and transversal ones show the trends of changes in depths, thicknesses and relations of rock sequences in individual parts of the area in question. The lack of some “series” in vertical profiles suggests variations in conditions of sedimentation. Discontinuity of some correlation lines between the boreholes under study supports the assumption about changes caused by facies differentiation. The results of interpretation of we 11 logging data may be applied in geological consideration aimed at evaluation of reservoir capacity of the Rotliegend rocks (generation, migration and storage of hydrocarbons). The comparison of results of geophysical interpre-tation with core analyses may bring about new data on the development of the Rotliegend strata.


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