Effect of concentration of dispersed organic matter on optical maturity parameters: Interlaboratory results of the organic matter concentration working group of the ICCP

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Mendonca Filho, JG (Author) Other; Araujo, CV (Author) Other; Borrego, AG (Author) Other; Cook, A (Author) Other; Flores, D (Author) FCUP; Hackley, P (Author) Other; Hower, JC (Author) Other; Kern, ML (Author) Other; Kommeren, K (Author) Other; Kus, J (Author) Other; Mastalerz, M (Author) Other; Mendonca, JO (Author) Other; Menezes, TR (Author) Other; Newman, J (Author) Other; Ranasinghe, P (Author) Other; Souza, IVAF (Author) Other; Suarez Ruiz, I (Author) Other; Ujiie, Y (Author) Other

Journal

Title: International Journal of Coal Geology

Vol. 84 No. 3-4

Pages: 154-165

ISSN: 0166-5162

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 22 Citations

Scopus - 24 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

Other information

Authenticus ID: P-003-0J8

DOI: 10.1016/j.coal.2010.07.005

Abstract (EN): The main objective of this work was to study the effect of the kerogen isolation procedures on maturity parameters of organic matter using optical microscopes. This work represents the results of the Organic Matter Concentration Working Group (OMCWG) of the International Committee for Coal and Organic Petrology (ICCP) during the years 2008 and 2009. Four samples have been analysed covering a range of maturity (low and moderate) and terrestrial and marine geological settings. The analyses comprise random vitrinite reflectance measured on both kerogen concentrate and whole rock mounts and fluorescence spectra taken on alginite. Eighteen participants from twelve laboratories from all over the world performed the analyses. Samples of continental settings contained enough vitrinite for participants to record around 50 measurements whereas fewer readings were taken on samples from marine setting. The scatter of results was also larger in the samples of marine origin. Similar vitrinite reflectance values were in general recorded in the whole rock and in the kerogen concentrate. The small deviations of the trend cannot be attributed to the acid treatment involved in kerogen isolation but to reasons related to components identification or to the difficulty to achieve a good polish of samples with high mineral matter content. In samples difficult to polish, vitrinite reflectance was measured on whole rock tended to be lower. The presence or absence of rock fabric affected the selection of the vitrinite population for measurement and this also had an influence in the average value reported and in the scatter of the results. Slightly lower standard deviations were reported for the analyses run on kerogen concentrates. Considering the spectral fluorescence results, it was observed that the lambda max presents a shift to higher wavelengths in the kerogen concentrate sample in comparison to the whole-rock sample, thus revealing an influence of preparation methods (acid treatment) on fluorescence properties.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12