Thread - Request – Additional information – Investigation IVT10524 – SLB response

Written by Claude Haiku 4.5 from the extracted text on 10 Jul 2026. It can miss or misread redacted and scanned pages. Check the source before relying on it.

NOPSEMA's Environment Specialist requested clarification from Schlumberger WesternGeco regarding Investigation IVT10524, specifically about seismic survey acquisition data and marine mammal sightings. The operator confirmed that black lines on interim mapping represent full-power acquisition lines without soft-start (low power) run-in shots included. Additionally, Schlumberger identified potential positioning errors for two marine mammal sightings (53 and 72) that appeared to occur within a Biologically Important Area (BIA) and buffer zone based on logged coordinates. Analysis of shot timings relative to vessel movements into and out of the BIA suggested the sighting coordinates were incorrectly transferred to the JNCC data sheet, with both incidents actually occurring after the vessel had already departed the protected areas. This correspondence demonstrates NOPSEMA's verification of survey compliance and environmental monitoring data accuracy during the investigation.