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The measurement and interpretation methodology of resistivity logs affected by the Groningen effect – a Polish case study

Baudzis Stanisław, Jarzyna Jadwiga A., Puskarczyk Edyta

Geology, Geophysics and Environment

2020

Vol. 46, no. 1

35--47

True formation resistivity Rt measurement is one of the fundamental logs in the calculation of hydrocarbon resources. That is why it is very important to have the most reliable resistivity data possible. In this paper, the various outcomes obtained by Polish well log analysts and engineers for the proper determination of hydrocarbon saturation in the Main Dolomite deposits in the Polish Lowland are presented. The long history of efforts directed to make proper exploitation decisions in wells where the Groningen effect has been observed is illustrated, starting with the standard measurement and interpretational approach, through the modified construction of a reference electrode in a Laterolog device and ending with an examination of HRLA (High Resolution Laterolog Array) or Array Compensated Resistivity Tool) ACRt results. The processing of resistivity logs with the special Poprawki software is included.

Czy anizotropia elektryczna może być wywołana zmianami nasycenia wodą i gazem w mikro- i makroporach skał miocenu?

Bała M.

Przegląd Geologiczny

2013

Vol. 61, nr 9

523--531

The paper presents the problem of evaluation of variation in the electrical anisotropy coefficient for sandstone-shaly Miocene deposits depending on water and gas saturation of the pore space. A rock model built of alternating layers with varying micro- and macroporosity is discussed. This may correspond to a rock formation composed ofparallel thin layers of sandstones or mudstones and claystones, which are dominated by macro- and micropores, and are characterized by different grain size or grain sorting. The anisotropy coefficient is then affected by changes in electrical resistivity in individual layers that are a result of changes in saturation.