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PESA Vic-Tas May Technical Meeting and Branch Annual General Meeting
Wednesday, 22 May, 2019 @ 12:00 pm - 2:00 pmFree
Some oil and gas fields (e.g., Pluto/Wheatstone), and many yet to be found fields, lie beneath areas where the sea-floor bathymetry changes rapidly. This has caused nightmares for many seismic processors since the 1990s and still causes problems for seismic interpreters today. Some new seismic processing and acquisition technologies offer potential solutions but probably not without substantial geological input into the velocity model building. In fact, there’s even more to the problem than just geology! An understanding of carbonate rock physics, geomechanics and potential fields is required to put yourself in the best possible position for improving seismic imaging below rugose sea-floors.
Integrating these diverse topics into a seismic processing scheme can be seen in an example from the outer Browse Basin, using the Kraken 3D survey, which had previously been processed (unsatisfactorily) a few times. A home-grown method for building a velocity model to initiate prestack depth migration imaging was built by many hands and delivered a stunning improvement in data quality. Sadly, it also appears to have killed a prospect. But perhaps it will bear fruit somewhere else soon.