SIP are delighted to showcase the results of recent reprocessing of legacy data in the Southern North Sea. SIP's Beam Tomography and GRT angle depth migration processing results in superior images, enabling better structural and lithological interpretation.
SIP's reprocessing of the Ravenspurn/Cavendish area, shown below, displayed improved imaging below the deformed sediment layers
Reprocessing of legacy data in the Lochran area of Dogger Bank, below, shows a significant uplift in the migrated image. A comparison of SIP's GRT image versus the legacy PSDM processing demonstrated improved imaging of the complex geology, enabling a greater understanding of the structures.
SIP applied its proprietary Guided Wave Migration (eGWM). The problem with ray-based migrations, such as Kirchhoff, is that they can't handle multi-arrivals and these events appear like multiples. Also, a model based on Kirchhoff gathers is not correct for Reverse Time Migration (RTM) as events migrate to the wrong place in complex geology (Salt, Basalts etc). Gathers from wave equation migration (WEM) are required. Historically, this has only been done by using large data centres. SIP's eGWM has no need for this. The resulting images provided a further uplift in image quality. The deep structure is not contaminated with multiples, unlike the legacy depth migration and the geology is more clearly imaged.
In another survey in the Dogger Bank area, VE08, SIP's GRT migration showed big improvements compared to legacy PSTM migration. The events are more continuous and the faults are imaged more clearly.
For details of how SIP can enhance your legacy data, please contact the team.