Preliminary Absolute Gravity Survey Results From Water Injection Monitoring Program At Prudhoe Bay

A recent gravity survey conducted in Prudhoe Bay, Alaska using a newly developed A-10 portable absolute field gravity meter is described. The survey was performed for BP Exploration Alaska (BPXA) to obtain a regional baseline gravity map prior to the initiation of a water injection program scheduled for Fall 2002. Absolute gravity measurements will be used to monitor subsurface density changes over time, and in this current survey, absolute gravity was measured at over 200 sites located on land and ice. The measurements showed repeatability of 3.5 Gal, and production rates were as high as 10 new points per day.