Methods for Efficient and Safe 3D Seismic Acquisition in Arctic Conditions

Abstract

There is a growing interest in seismic surveys in arctic areas. Normally 2D surveys can be carried out with limited risk, as long as the area is reasonably free of ice. However, 3D seismic surveys are an essential tool for exploration in order to de-risk prospective areas ahead of expensive and challenging drilling operations. Acquisition of 3D surveys, with multiple streamers, is far more difficult than single streamer 2D surveys, as the amount of in-sea equipment is an order of magnitude higher and the data density for a given area covered is far greater: the physical footprint of a 3D equipment spread being towed behind a vessel can be about a kilometer wide by several kilometers long. This significantly increases the risk of equipment damage due to ice. This paper summarizes experiences from several 3D surveys in the Arctic, and addresses how the use of new equipment and techniques can reduce such risks to acceptable levels.