The primary application of multi-component exploration in the study of complicated structures in Bohai area

摘要

A larger of shallow gas pay in Bohai Penglai A structure formed screening effect, no matter on ether 2D or 3D seismic exploration, The reflection frequency of ordinary compression wave and energy are serious loss, So it make seismic imaging can not exactly display the character of geologic structure. Although has been done a series of special processing in order to resolve the problem of structure imaging, including prestack depth migration processing, but still can not get an perfect reflection, So we can do offshore 3D four-component (4-c) seismic exploration and 2D offshore four-component (4-c) seismic acquisition in this structure. By observing the character of rock and the geologic reconnaissance on the site, doing the shallow drilling analysis and multi-component seismic experiment, we can confirm what the flow about offshore acquisition is. Considering the particularity of converted-wave processing, we should specially pay attention to the produce of CCP gather, azimuth rotation of horizontal component, statics and DMO during processing, and can get a good converted-wave section. By correctly identifying the character of waveform, making use of full wave-train logging and converted- wave VSP to produce synthetic seismo-gram and VSP section, then calibrating has been done. Studying the character of structure carefully, do reservoir characterization describe, instruct the evaluation of reserves about oilfield.