--> Integrated Reservoir Modelling of a Deep Water Canyon Complex From Exmouth Sub-basin, Northwest Australia

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Integrated Reservoir Modelling of a Deep Water Canyon Complex From Exmouth Sub-basin, Northwest Australia

Abstract

Superior seismic data quality has enabled improved reservoir modelling of the Macedon turbidite oil and gas accumulations in the Exmouth Sub-basin, offshore Northwest Australia. Deterministic inversion plays an important role in delineating the numerous hydrocarbon pools and in confirming the gas-oil contacts across different pools. One of the oil and gas accumulations Woodside has yet to develop is the Laverda Canyon, which was discovered in October 2000 and confirmed with two further appraisal wells in 2011. It is a Late Jurassic, deep water canyon that fed the large turbidite fans to the north and east of the field and is characterised by good quality, high net-to-gross sands. Intensive seismic interpretation effort allowed a detailed structural framework to be built, which then enabled structural restoration for delineating the internal architecture of the canyon, including a 4th order cut and fill sequence. The sediment fill itself can be grouped into three acoustic categories: soft good quality reservoir sand; hard cemented sandstones, and an intermediate category made up of a mixture of sandstones, siltstones and conglomerates. Detailed sedimentary facies from cores and well logs was carefully incorporated to complement the limited vertical resolution of the seismic geo-bodies. All of this effort resulted in integrated and robust static models that are currently being used to determine an optimum drainage plan.