Workshop 19

Convenors

• Abderrahim LAFRAM (TotalEnergies)
• Youssef Arroub (TotalEnergies)
• Didier Lecerf (TGS) 
• Jonathan Brain – (Shell)
• Per Eivind Dhelie – (AkerBP)
• Roberto de Melo Dias (Petrobras)

Description

For optimal 4D results, that reduce sub-surface uncertainties and enable unambiguous interpretation, it has been industry best practice to repeat seismic acquisitions as closely as possible. However, there are situations where this is either not possible due to operational constraints or advisable for long term monitoring strategies that require improved data quality. This could be the transition from towed streamer system to Ocean Bottom Nodes acquisition, upgrading old narrow tow pre-production streamer seismic, opportunistic 4D’s from new multi-client data or changes to OBN designs for operational efficiency.

Historically, non-repeatable acquisitions have usually resulted in noisy 4D data that is difficult to interpret for all but the largest signals and is of limited value for field development decisions. But in recent years, 4D processing workflows and technologies have made significant advances and produced some excellent results, even for hybrid streamer-OBN cases. Therefore, it is a good time to assess whether acquisition differences are still a blocker for reliable 4D interpretation or if repeatability can be relaxed, or partially relaxed, as a result.

Sub-Topics that will be covered in the workshop:

The workshop will bring together geoscientists from operators, service providers and academia to answer a few key questions:

• Is it possible to obtain interpretable 4D signal from acquisitions with different geometries and/or acquisition methods?
• What are the processing workflows and the technologies that can be used to tackle the lack of repeatability?
• Eventually, how such products are used by interpreters and how the possible increase of 4D noise is managed by the Asset Geoscientist.

Participant Profile

Geoscientists from operators / contractors/ academia