Chemical composition of Antrim shale in the Michigan basin
Year: 1980
Type: report
Abstract: During the period between March 1977 and July 1980 core samples from 28 different wells at various locations in the Antrim shale deposit in the Michigan Basin were analyzed for Al, SiO/sub 2/, Fe, Mg, Ca, Na, S, Pb, Hg, Ba, Sb, Sn, Cd, Ag, Mo, Sr, Br, As, Zn, Cu, Ni, Co, Mn, Cr, V, Sc, Cl, P, F, B, Be, and Li. The geochemical analysis revealed that the sulfur content of the shale varied proportionately with that of carbon. On the other hand, calcium values vary inversely with organic carbon (lowest calcite in shale with highest organic carbon). Iron values do not vary greatly within a core and show no tendency to follow organic carbon or sulfur. It seems that the relationships that exist between the chemical species are controlled by the geological events that resulted in the formation of the shale. The kerogen was found to be a crosslinked polymeric structure consisting of roughly equal amounts of aromatic and aliphatic carbons. Functional groups are few, mainly hydroxy and olefinic double bonds. The bitumen (toluene extractable material) was fractionated and the fractions identified. The paraffins in the samples had the same constituents in differing concentrations while the aromatic fractions appear to have significant differences in composition. The distribution of the n-alkanes indicates the shale is more mature than the Green River shales. The amount of vanadyl porphyrin is greater than the amount of nickel and the ratio increases with depth. The concentration of petroporphyrins ranged from one-tenth to one-third the amount extracted from western oil shales.
DOI: 10.2172/5117229
Authors: D. G. Leddy, V. R. Sandel, G. L. Swartz, D. H. Kenny, W. M. Gulick, H. S. El Khadem
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W52238503