Gas Chimneys 3D

The maps “Amplitude anomalies” represent the distribution of gas indicators in the form of amplitude anomalies in seismic data, such as bright spots, gas chimneys, seismic transparent zones and velocity pull-downs. The study area covers the German North Sea sector and the depths of the first 1.000 m below the seabed. Various seismic data were available as data bases: approx. 30.000 km 2D data and approx. 4.000 km² 3D data. The mapping of amplitude anomalies indicating gas serves as a basis for further investigations into near-surface natural gas deposits in the German North Sea sector. The near-surface gas deposits up to 1.000 m depth in neighbouring countries suggest that there could also be near-surface natural gas reserves in the German North Sea sector. Three of the Dutch near-surface natural gas deposits, near the German-Dutch border, are already in production (Muntendam-Bos et al., 2009). This shows that such natural gas reserves are a potential source of energy. If smaller natural gas deposits were to be found near planned wind farms, natural gas could be extracted and burned directly on site, and during windtimes it could propel turbines. This combination could enable a continuous energy supply. Since natural gas in the sediment can negatively affect the building ground properties, knowledge about the distribution of natural gas deposits in the depths of the foundation depth of wind turbines is also important from this point of view. The location of all mapped gas chimneys is marked in red. In seismic data, these form as vertical, caminous structures and are among the indicators of possible gas deposits. The reflectors within this structure have low amplitudes and can be described as chaotic. These characteristics can be explained by the rise of (gas-containing) fluids and the resulting destruction of the original sediment structure. Literature: Muntendam-Bos, A. G., Wassing, B. B. T., Heege, J. H. t., Bergen, F.v., Schavemaker, Y.A., Gessel, S. F. v., Jong, M. L. d., Nelskamp, S., Thienen-Visser, K. v., Guasti, E., Belt, F. J. G. v. d., and Marges, V.C., 2009. Inventory non-conventional gas. TNO, Utrecht.