Coquina carbonate reservoir analogues - Key learnings from the cretaceous, NE Brazil, and the holocene, W Australia

Coquinas are important reservoir units in Pre-Salt reservoirs of the Southern Atlantic. The Cretaceous Morro do Chaves, onshore NE Brazil, has long been considered an analogue for the reservoirs. The Holocene coquina deposits accumulating at the southern end of Shark Bay, Western Australia, have also been proposed as an analogue. In this paper, new petrophysical data from the Cretaceous outcrop have been combined with training images from the Recent analogue to produce geoengineering models for use in reservoir simulation models to understand possible reservoir engineering signatures. In this paper we discuss the learnings that come from these outcrop studies and show how they might be utilised in reservoir characterisation and upscaling studies of coquina reservoirs to improve understanding of reservoir behaviour.