Abstract

Field data examples show that the 4D repeatability is dependent on the source strength. From a single data set, where the recording time is 30 seconds, it is concluded that the signal to noise generated by the previous shot, increases when the source strength increases. Another way to ensure good repeatability and diminish the effect of the noise from the previous shots, is to increase the time interval between succeeding shots. By varying the source strength in a controlled manner it is demonstrated that it is possible to quantify directly for a given field how big an amplitude change is needed to be detected by 4D seismic data acquired over the field, within a reasonable accuracy. It is suggested to vary the source strength gradually by changing the firing pressure of the air gun source array.

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