Spectrum Completes Subsalt Imaging in North Gabon

Spectrum’s geoscientists have completed an extensive hydrocarbon prospectivity review offshore North Gabon using 5,500 km2 of modern 3D seismic data, recently acquired to image the deep syn-rift units and to provide a regional framework for the traditional post-rift hydrocarbon plays.

Two major petroleum systems are present with source rocks and reservoirs distributed in the pre-salt syn-rift sequences and in several post-rift sequences. Each petroleum system is characterized by various source rocks, reservoirs and trapping mechanisms.

The Nyonie Deep gas discovery has proven reservoir properties in the pre-salt section syn-rift sections of Gamba Sands and Dentale Fms. Oil bearing targets are known in the clastic and calcareous deposits of the Late Cretaceous.

In the syn-rift, mostly lacustrine source rocks are expected to be oil generative from the end of the Cretaceous and Paleogene, or even later in case of a burial less than 3-4 km. Post-rift units have a number of marine source rocks, pushed into an early oil window from the Paleogene and during the Neogene, mostly as result of their close proximity to highly conductive salt bodies.

Regional extensional faults show an echelon trend with strike direction between N-S and NW-SE, generating large structural closures at base salt level, potentially over 150-200 km2, clearly visible in the initial stages of the time processing, and expected to be fully imaged by the end of the Depth Migration exercise.

Salt withdrawal occurred mainly during the Late Cretaceous-Paleogene, controlling the deposition of the post-rift sequences, which are organized in a variety of structural and stratigraphic traps, most of which remain untested. Finally, the proper imaging of subsalt traps is expected to uncover potential hydrocarbon resources, economically attractive and overlooked from the past exploration.

Share this article

Follow Subsea World News

Events>

<< Oct 2019 >>
MTWTFSS
30 1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31 1 2 3

6th Offshore Well Intervention Conference Gulf of Mexico

The Offshore Well Intervention Gulf of Mexico conference (OWI GOM) is returning to Houston, Texas for its sixth year on Wednesday 20 – Thursday 21 November.

Featuring Anadarko, BP, Shell, Chevron, BHGE and Oceaneering, the conference aims to help operators transition to the latest compliance updates, WI systems and business models that enhance safety, quicken well access and improve commerciality.

Across two days, more than 200 delegates, 15 exhibitors and 30 speakers will network together and create solutions to some of the most pertinent industry challenges right now, through a conference programme focused on:

  1. Clarifying compliance updates
  2. Quicker well access and safer well control
  3. ​Understanding HPHT well intervention (systems)
  4. Forecasting well intervention activity, discussing new commercial models and comparing platform options
  5. Best practice riserless well intervention
  6. ​The latest well intervention equipment

For registration, speaking or sponsorship enquiries contact Abigail Clifton on aclifton@offsnet.com; +44 (0) 203 793 8800.

More info

read more >

OCEANS 2019

OCEANS is the bi-annual event for global marine technologists, engineers, students…

read more >

OTC Brasil

The conference is organized by the Offshore Technology Conference (OTC) and Brazilian Petroleum…

read more >

Europort 2019

Europort, organised in the world port city of Rotterdam, will be the leading exhibition for special purpose vessels…

read more >