Upper Jurassic-Cretacous Succession

The line is showing salt related structures in the Upper Jurassic-Cretaceous succession unconformably overlain by a Tertiary-Recent succession. A thick Lower-Middle Jurassic section, predicted to contain the main potential source rock interval in the Algarve Basin, is present below the Upper Jurassic salt. Source rocks within this interval are modelled to be generating oil and gas at present. Triassic salt structures can be observed below. In addition to containing source rocks, the Lower-Middle Jurassic section is predicted to contain siliciclastic reservoirs.

Possible DHI’s and oil seep observed from satellite images (by Infoterra, www.infoterra-global.com). These may be interpreted to represent an area, where faults extend from zones where the Upper Jurassic salt is thin or absent, allowing hydrocarbons generated below this salt to ”escape” and to migrate vertically along the faults up to the sea floor.

This is an example from one of several un- or under-explored basins offshore Portugal with strong indications that working hydrocarbon systems exist.

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