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1 Acta Geophysica Polonica

1 1998

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The use of seismic method for monitoring underground gas storage in salt domes

Pietsch K., Ślusarczyk R.

Acta Geophysica Polonica

1998

Vol. 46, nr 2

145-159

A possibility of detecting gas leakage from gas storage through fractures in the dome's cap is presented. Seismic wave field anomalies above gas deposits may be caused by continuous diffusion of hydrocarbons into the rockmass. These anomalies have good correlation with geochemical anomalies. The identification of 'hydrocarbon diffusion chimneys' and their correlation with the surface geochemical anomalies are deposit indicators. The same situation may be observed above underground gas storage when gas is escaping from a salt dome. To determine a relationship between velocity changes and gas saturation ratio, the theoretical modelling was conducted for the Mogilno salt dome. Also the theoretical seismic field was constructed for models 'with' and 'without' gas to determine the criteria for identifying seismic anomalies due to gas diffusion. A very distinct seismic anomaly points to a possibility of identifying zones with vertical gas diffusion in seismic records. The monitoring of the area above gas storage will be made with the high resolution seismic method before and during exploitation of the gas storage.