WGP extends offshore Norway reservoir monitoring, 3D services

Offshore staff

WARMINSTER, UK – Thalassa Holdings has issued an update in the reservoir monitoring programs offshore Norway of its subsidiary WGP Exploration.

Design improvements to the company’s dual portable modular source system (D-PMSS) during the 2014-15 winter maintenance period paid off last year, helping WGP to deliver four successful permanent reservoir monitoring (PRM) surveys.

The company acquired more than 6,000 km (3,728 mi) of data last spring for Statoil over the Snorre and Grane fields, on time and with better than expected technical downtime levels.

Although Statoil reduced last fall’s surveys to a total of just under 4,000 km (2,485 mi), downtime levels improved for the two surveys completed at the end of October.

The system was then demobilized to WGP’s storage facility onshore for the first of a two-stage maintenance program before the spring 2016 start-up took place. 

Last April, WGP secured a contract to acquire high resolution 3D (HR3D) P-Cable seismic in the Barents Sea for TGS Nopec Geophysical. This was a follow-on project from multi-client operations performed in 2014, and also deployed the vessel Bergen Surveyor.

Operations started early last May. The program comprised extended regional coverage with high resolution single swath 3D (HRSS3D) data acquisition, combined with targeted HR3D blocks.

This season’s targets are to acquire speculative HR2D data for TGS in new blocks, and to provide an insight into the potential of both P-Cable data and also shallow target resolution in previously identified focus areas.

WGP’s improvements in its handling systems, navigation, 3D binning, and in-water towing geometry led to better than expected results in terms of acquisition efficiencies.

The company is optimistic about future prospects for HR3D/HRSS3D and plans to further improve its suite of systems.

Last December, ConocoPhillips Norge awarded WGP a long-term contract for seismic data acquisition services on the Ekofisk field in the southern Norwegian North Sea.

The five-year program starts this summer and entails acquisition of surveys twice a year during spring and fall over the already installed Optoplan recording system.

In addition to the source systems, WGP will develop and run a data management and real time QC system for installation in ConocoPhillips’ Norwegian operations center in Stavanger.

Work on design and build of the containerized source has started with pre-build planned for August, followed by mobilization onto the PSV Skandi Nova in early September.


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