A detailed geochemical study has shown that oils from the Porcupine and Jeanne d'Arc basins were not sourced from a typical, fully marine Upper Jurassic Kimmeridge Clay Formation equivalent. Rather, these oils are thought to be a mixture of hydrocarbons derived from an atypical Upper Jurassic shale and from a Middle Jurassic non-marine source interval. Standard geochemical techniques were used to analyse a suite of oil samples from the Atlantic margin, along with new proprietary geochemical parameters which can discriminate age and depositional environment. The results indicate that oils from the Porcupine and Jeanne d'Arc basins are very similar, and originated from a mixture of an unusual marine source rock and a lacustrine algal source rock. This conclusion is strengthened by considering the regional geology, as several marine and non-marine potential source rock intervals are present in both the Porcupine and Jeanne d'Arc basins.
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