Abstract
AN interesting paper on the geology of the Persian oilfields by Messrs. H. G. Busk and H. T. Mayo was read at the meeting of the Institution of Petroleum Technologists on October 15. Three areas are treated: the Bakhtiari country, in which the only oilfield worked as yet is situated; the Ahwaz-Pusht-i-Kuh country; and the Qishm Island and Persian Gulf region. The first of these is described in most detail. The rocks are divided into three series: The Asmari, Eo-cretaceous, at the base consists of massive limestones 2000 ft. or more in thickness. It is succeeded by the Miocene Pars series, more than 7000 ft. thick, divided into three groups: the lower, formed of some 3500 ft. of massive gypsum, shales, clays, and intercalated beds of detrital limestone; the middle, 1000 ft. of clays, shales, intercalated gypsum, limestone, and sandstone; and the upper, 2700 ft. of clays, shales, and intercalated red and brown sandstones. The Fars series is overlaid by the Bakhtiari series of Pliocene age, of which the lower group, 13,000 ft. or more of clays, sandstone, and conglomerate, is regarded as of lacustrine origin; and the upper, 2000 ft. of massive conglomerates, as, torrential. The oil is found in the lower Pars group, the detrital limestones forming the reservoir; at Maidan-i-Naftun the wells all flow under strong pressure, and after ten years of remarkable production show no signs of exhaustion.
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Geology of the Persina Oilfields . Nature 102, 234–235 (1918). https://doi.org/10.1038/102234b0
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DOI: https://doi.org/10.1038/102234b0