There are different vintages of seismic data acquired and processed using different parameters in the northern South Chi-na Sea,but imaging quality is not good enough for Mesozoic hydrocarbon exploration.It is necessary to conduct an in-depth study of major controls on seismic imaging.Based on available 2D seismic data,we investigate geologic setting and sedimentation in this area and perform forward modeling of the representative geologic framework to dissect geologic and geophysical factors related to seismic imaging of the Mesozoic Erathem and establish major controls on seismic imaging qualitatively and quantitatively in differ-ent geologic conditions.The major controls include two strong reflection boundaries at the seabed and Cenozoic bottom,low signal to noise ratio caused by small impedance contrasts inside the Mesozoic Erathem,various disturbing waves such as diffracted waves and multiples that blur effective signals,and scattered illumination energy induced by irregular seabed.The in-depth study of major controls on seismic imaging offers support to seismic data acquisition and processing targeting the Mesozoic Erathem in this area.Corresponding acquisition solutions include increasing excitation energy,folds,sinking depth of air gun cables,and dimensions to obtain more deep-zone reflection energy.Corresponding processing solutions include self-adaptive ghost suppression,multi-domain high signal-to-noise ratio processing,and energy compensation based on frequency resonance to address the issue of weak reflec-tions,broadband integrated filtering to attenuate multiples,and high-precision velocity analysis through along-horizon high-density velocity picking based on the understanding of geology and refracted waves.
Mesozoic Erathem in the northern South China Seaseismic data qualitystrong reflection boundarywave impedance contrastirregular seabedseismic illumination energy
维普
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