Abstract
Pyrolysis-gas chromatography of rocks from three exploratory wells in the Gandhar area of the Cambay Basin, India, reveals that the organic matter is dominated by input from higher land plants. The pyrograms of asphaltenes and kerogens demonstrate that the Hazad and Cambay Shale were deposited in different environments with the former being an overall regressive deltaic environment and the latter a marine transgressive sequence. Studies of TOC (values range from 1 to 2.6%), Rock-Eval (HI values range from 70 to 183), pyrolysis-gas chromatography, vitrinite reflectance ( R o range from 0.4 to 0.8), bitumen extracts and isotopic ratios demonstrate that both Hazad and upper Cambay Shale can act as effective source rocks wherever they are thermally mature.
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