Pyrochromatographic analyses were performed on samples of Antrim shale from 35 wells and nine outcrops in the Michigan Basin. Hydrocarbon components from C/sub 5/ to C/sub 30/ were measured. The majority of the analyses indicate the Antrim to be potentially gas productive. The total hydrocarbon count for each well was divided by the number of samples analyzed to obtain the average hydrocarbon count per sample. Hydrocarbon counts per sample generally increase with depth and toward the center of the Michigan Basin. A bar graph for each well, showing the total hydrocarbon count for each sample, by depth, was plotted and compared with the gamma ray log. A correlation coefficient of 0.696 between increased hydrocarbon counts and increased radioactivity was calcuated based on data from five wells.