Enviros performed geophysical site surveys 1000m x 1000m area, at two locations to provide detailed information on the seabed and shallow soils, in order to assess the risks of emplacement of, and subsequent drilling, of a jack-up rig, with data to cover a sub-seabed depth of 700m – 800m for drilling risk assessment.
The following equipment was used to complete the surveys:
- Multibeam Echosounder: Reson 7125;
- Singlebeam Echosounder: Reson Navisound 600RT;
- Sub-Bottom Profiler (Pinger): SES/CODA DA2000, Massa 3x3 Hull-Mounted Array;
- Sub-Bottom Profiler (Sparker): GSO 360 Sparkers, 8 element single channel ministreamer;
- 2D High Resolution Seismic: 1200m GeoEel 96 Channel, Streamer (12.5m Gl), DGPS Tailbuoy System;
- Piston/Drop Corer: Enviros Corer with Capability, Day Grab;
- Side Scan Sonar: Klein 3000 (x2);
- Magnetometer: Geometrics G882 (x2);
- USBL iXBLUE GAPS;
- DGPS: C-NAV 3050 (Primary) and Fugro Marinestar (Secondary);
- Motion Sensor Applanix POS MV;
- Gyro Meridian Surveyor (x2);
- SVP/CTD Valeport MIDAS SVX2 (x2);
- Communications: VSAT SatCom, with dedicated email PC and file transfer capability;
- Grab Sampler: OSIL Van Veen Grab;
- PCPT: Neptune 5000 with spare rods.
Project Organisation
Enviros were responsible for performance of all pre-mobilisation, mobilisation, fieldwork, demobilisation and associated data processing, interpretation and reporting. A senior Enviros Project Manager with >15 years relevant offshore site survey / investigation experience was appointed on contract award and responsible for each project phase and Client liaisons throughout. The Enviros Project Manager was appointed an experienced Enviros Offshore Project Manager for all fieldwork operations.
The Project Manager had the role of managing day-to-day issues relating to the project, based onshore in the Enviros head office based in United Kingdom. The Offshore Project Manager was responsible to ensuring that the project is completed in accordance with Enviros procedures and to Client specifications. Responsibilities include, but not limited to being the immediate point of contact for any Offshore Client Representatives, ensuring project QHSSE procedures are adhered to during all offshore operations; this is to include mobilisation, field calibrations and checks, project tasks, post project calibration checks and demobilisation; and the production or approval of all necessary field reporting.
