A case study on the hydrocarbon geology of Upper Permian (Zechstein-3) carbonates in licence P6, the Netherlands' offshore.
Abstract
Permian (Zechstein-3) carbonates in the P6 block, the Netherlands' offshore, were deposited in a subtidalintertidal-supratidal setting, in an overall shallowing-upwards mega sequence. Interpreted diagenetic events include in order of occurrence: lithification, dessication, early leaching, dolomitisation, anhydritisation, calcitisation and also late leaching, compaction/stylolitisation and late fracturation. The diagenetic sequence is related to the reconstructed burial history by plotting on a burial graph. Present diagenetic porosity (Moldic- intraparticle- vuggy- (enlarged) intercrystalline- fracture porosity) predates renewed hydrocarbon gas generation. Gas generation is continuing today.
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