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Open AccessArticle

Downhole Lithological Profile Reconstruction Based on Chemical Composition of Core Samples and Drill Cuttings Measured with Portable X-ray Fluorescence Spectrometer

1
Well Logging Department, Oil and Gas Institute–National Research Institute, 30-503 Kraków, Poland
2
PGNiG—Polish Oil and Gas Company, Zielona Góra Branch, 65-034 Zielona Góra, Poland
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(12), 1101; https://doi.org/10.3390/min10121101
Received: 29 October 2020 / Revised: 4 December 2020 / Accepted: 5 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Clays, Clay Minerals and Geology)
The reconstruction of a lithological profile based on geophysical logs of chemical composition provided by geochemical gamma-gamma well logging probes has been increasingly used for geophysical interpretation. A chemical profile, analogous to the measurements mentioned above, can be determined based on measurements made with a portable X-ray fluorescence spectrometer (pXRF). This paper presents a methodology for determining the mineral composition of drilled, clastic, as well as clay-rich rocks on the basis of both inexpensive and timesaving pXRF measurements as well as models combining the results of chemical composition analysis with results of mineral composition analysis (XRD). The results of chemical composition analysis obtained with a portable XRF spectrometer were calibrated based on a detailed analysis produced with ICP-OES and ICP-MS methods. A significant advantage of the proposed method is the possibility to apply it with regard to drill cuttings as well as archival cores. However, considerable discrepancies in the results obtained were identified while comparing the results of chemical composition analysed directly on the core and milled material. The analysed material comprised Carboniferous rocks derived from three boreholes located in Poland: Kobylin-1 as well as Biesiekierz-1 and -2. It was possible to directly compare the lithological profile obtained based on measurements taken on drill cuttings with the results of the lithological interpretation of a geochemical probe log. View Full-Text
Keywords: XRD; pXRF; geochemical logs; mineralogical logs; drill cuttings XRD; pXRF; geochemical logs; mineralogical logs; drill cuttings
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MDPI and ACS Style

Kowalska, S.; Kubik, B.; Skupio, R.; Wolański, K. Downhole Lithological Profile Reconstruction Based on Chemical Composition of Core Samples and Drill Cuttings Measured with Portable X-ray Fluorescence Spectrometer. Minerals 2020, 10, 1101. https://doi.org/10.3390/min10121101

AMA Style

Kowalska S, Kubik B, Skupio R, Wolański K. Downhole Lithological Profile Reconstruction Based on Chemical Composition of Core Samples and Drill Cuttings Measured with Portable X-ray Fluorescence Spectrometer. Minerals. 2020; 10(12):1101. https://doi.org/10.3390/min10121101

Chicago/Turabian Style

Kowalska, Sylwia; Kubik, Benedykt; Skupio, Rafał; Wolański, Krzysztof. 2020. "Downhole Lithological Profile Reconstruction Based on Chemical Composition of Core Samples and Drill Cuttings Measured with Portable X-ray Fluorescence Spectrometer" Minerals 10, no. 12: 1101. https://doi.org/10.3390/min10121101

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