Hannover 2003 – wissenschaftliches Programm

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AKE: Energie

AKE 4: CO₂-Entsorgung und Energieeffizienz

AKE 4.1: Hauptvortrag

Freitag, 28. März 2003, 11:00–11:45, F 428

CO₂ - store it in the underground or use it commercially? — •Tore A. Torp — Statoil Research Centre, Rotvoll, N-7005 Trondheim, Norway

At the Sleipner gas field in the North Sea, CO₂ has been stripped from the produced natural gas and injected into an overlying aquifer since October 1996. During that time, nearly 6 million tonnes of CO₂ have been injected without significant operational problems. The Sleipner project is the first commercial application of CO₂ storage in deep saline aquifers in the world. To monitor the injected CO₂, a separate EU supported project, Saline Aquifer CO₂ Storage (SACS), was established in 1998. Recently the third stage, studying the long term behaviour of CO₂ at Sleipner and making a feasibility study of 4 possible other storage sites in NO, DK, UK and GE, has started.

The CO₂ at Sleipner is injected into a large high permeability sand body (between 850 and 1500m deep, occupying 2.5 x 10⁴km²) which is overlain by a thick shale succession. Shales have very low permeability and are expected to provide an effective seal to the injected CO₂. As concluded by the 6 European geo-science institutes involved in SACS, there is every reason to expect the CO₂ to stay there the next few thousand years.

Simulation tools adapted to describe the migration of the CO₂ in the reservoir have shown themselves capable of replicating the position of the CO₂ and can, therefore, be used to simulate its future behavior.

The cumulative experiences of the Sleipner and SACS projects has been embodied in a No-dqBest Practice ManualNo-dq to assist other organisations planning CO₂ injection projects of this type.

The Kyoto protocol and the EU Directive on emission trading will, from 2005, put a price on CO₂ emissions. At the same time the oil and gas industry in the North Sea is coming to a development phase where by using CO₂ they can extract 5 - 10 times more oil. This creates a market for CO₂.