PGS has released a contiguous prestack GeoStreamer data covering 13,000 km 2 in Brazil’s Sergipe-Alagoas Basin.
PGS has released a contiguous prestack GeoStreamer data covering 13,000 km2 in Brazil’s Sergipe-Alagoas Basin. The data covers key offshore discoveries in the SEAL Basin. This extends coverage into deepwater areas relevant for recent leasing, and where future open acreage will be offered in upcoming Brazil bidding rounds.
The latest volume includes the recently reprocessed SEAL Bonita 3D PSDM and SEAL Pirambu PSDM in a single contiguous dataset. The data have been imaged with TTI PSDM to delineate the Cretaceous source and subtle AVO response of the Late Cretaceous reservoirs. The project has been seamlessly combined throughout the prestack depth migration velocity model-building sequence and final TTI PSDM images.
PGS acquired the 4547 km2 BM-SEAL 4-10-11 in 2014, delivering final time and depth data in 2015. This GeoStreamer 3D dataset covers Petrobras discoveries such as Barra, Farfan, Cumbe, Moita-Bonita, Muriu and Poco-Verde.
The company returned to the basin in 2018 and acquired an additional 8425 km2 MC3D data in the outboard deepwater area. For the SEAL Pirambu MC3D project, Ramform Tethys utilized a 16 x 100 x 8100 m dual-source configuration, achieving production rates of more than 80 km2/day in the challenging offshore Brazil environment, again delivering GeoStreamer data. The full integrity PSTM products were delivered in 2019 and PGS embarked on anisotropic PSDM processing of the Deepwater SEAL Pirambu portion.
Then, PGS preprocessed the SEAL 4-10-11 with the latest signal processing, multiple attenuation, and noise attenuation workflows, and combined it with Pirambu to create a TTI KPSDM volume covering nearly 13,000 km2. A full integrity KPSTM is also available.
In recent years, Petrobras has reported light oil, natural gas and condensate discoveries in the deepwater Sergipe-Alagoas Basin. These potentially significant discoveries are characterized by an efficient marine source rock with accumulations in Upper Cretaceous turbidite reservoirs. PGS’ Bonita MC3D reprocessing covers these key up-dip discoveries, where it is understood Petrobras is promoting farm-in opportunities.
Appraisal work of these discoveries has been continuing and in late February 2020 Petrobras communicated the start of an extended well test (EWT) of the Farfan discovery, with an estimated test duration of 180 days. Petrobras operates block BM-SEAL-11, where the Farfan discovery lies, with a 60% interest. It is partnered by IBV Brasil, a 50:50 Indian joint venture between state-controlled Bharat Petroleum and privately run Videocon Industries, which hold the remaining 40% interest.
The reservoir intervals for these Petrobras discoveries potentially extend along strike and into deeper water. PGS’ mapping of the proposed source interval shows a mature source for the area. Exploration for these intervals is expected to continue.
