Low fold coverage of seismic data usually happen at the beginning and the end of the seismic line, or in the area where the survey lines go through villages or river. In some cases, seismic lines was designed as small fold as possible in order to minimize the cost of acquisition. The effect of low fold coverage in the conventional CMP stack can be seen as the decreasing of signal-to-noise ratio, because this ratio is proportional with the square of numbers of fold (Yilmaz, 1987). Smaller fold tends to make lower signalto-noise ratio of the data. Thus, decreasing of seismic image quality in the low fold zone is usually happened after processing of seismic data with NMO/DMO correction. This paper explains about the advantage of new stack technique, which has been applied to three 2D seismic data with low fold coverage. This approach was firstly introduce by Hubral in 1988 and then called “zero offset common reflection stack” (or ZOCRS Stack). The results show that this method can improve and increase the quality of seismic image. The results are much better than those that have been produced before by applying NMO/DMO stacking method.
Authors : E. A. Sentani, R. Sule, M. S. Jaya, A. Widiatmoko, Yendri, I. Purwaman