Abstract
Pyrolysis-gas chromatography of sedimentary sequences from a key exploratory well of the southern Cambay Basin, India, has been performed to characterize the nature of the source material and its maturity. In samples from the Eocene-Paleocene section (2960–3407 m), the pyrolysate is dominated by hydrocarbons in the lower molecular weight region indicating a significant input algal source material. The presence of various xylenes and phenols in the pyrograms is indicative of a significant input from higher plant material. The organic material in this section is interpreted to have been derived from marine-terrestrial source inputs deposited under swampy to marine and reducing environments. Good mature source rocks with type III kerogens which are wet gas/gas condensate-prone have been identified in this region. This paper intends to discuss the characterization of source rocks using the pyrolysis-gas chromatography approach and the significance of the distribution of the pyrolysis product.
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