Abstract
Natural gases reservoired along with oil in the Miocene sequences of Bombay High, a giant carbonate structure in the Bombay Offshore Basin in the west coast of India, have been studied for stable carbon (delta 13C) and hydrogen (delta D) isotopic enrichments. An attempt has been made to genetically correlate these gases, to evaluate the maturity of their source and to delineate more probable major source rock for hydrocarbons reservoired in Bombay High. The study reveals that these gases are genetically correlatable, mildly altered and have been generated at peak oil generation stage at maturity around 1.0% R 0, and the possibiity of Paleogene sequences in the Dahanu depression in the north east of the Bombay platform having acted as major source rock is indicated.
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