Alseamar completes geochemical survey with underwater gliders

Offshore staff

PARIS – Alseamar recently completed a pre-exploration survey with two of its Sea Explorer gliders fitted with Minifluo hydrocarbon sensors.

The main objectives were to characterize the ocean environment and assess natural oil seeps emanating from the seabed in the survey area. The data compiled includes temperature, salinity, pressure, dissolved oxygen, and hydrocarbon-like components (phenanthrene and naphthalene) in about 700 m (2,296 ft) of water.

Driven by buoyancy variation, underwater gliders autonomously collect data along the water column for weeks to months at a time. Alseamar said that the units are piloted from shore by satellite telemetry and do not require surface supervising vessel.

The two Sea Explorer gliders squared the survey area following pre-defined lines and cross lines while collecting ocean data with physical and bio-chemical sensors. Data files were transmitted by satellite telemetry in near real-time during operations.

The Minifluo hydrocarbon sensor has been developed by the French CNRS Mediterranean Institute of Oceanography to particularly target representative contaminants of crude oil compounds.

08/20/2015

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