Directional designature using a bootstrap approach
Chang‐Chun Lee, Yunfeng (Fred) Li, Suryadeep Ray, G. Poole · 2014
Summary One of the primary goals of seismic acquisition is to deliver accurate broadband data that is rich in both low and high frequencies. Obtaining a good representation of the earth's reflectivity requires the removal of the source signature. In marine acquisition, common practice is to use a single far-field source wavelet to remove the source signature from the recorded seismic data. Yet, this requires the repeatability of source energy from shot-to-shot and ignores the effects of the source array directivity. In light of our goals, the two issues of source signature repeatability and source array directivity become critical. We propose a directional designature where the near-field hydrophone measurements are used shot-to-shot, and the source directivity is derived from the source ghost-delay time that is self-determined by a bootstrap approach. We compared this algorithm to the conventional, non-directional far-field designature using variable-depth streamer data from the Gulf of Mexico.