P185 Optimisation of Conventional and Over Under Source Cable Depths K.J. Davies* (Chevron ETC) & G. Hampson (Chevron ETC) SUMMARY Scattering and attenuation in basalt or salt often restricts recordable reflection energy to only a few tens of Hz. Enhancing low frequency energy helps to compensate for the effects of scattering and attenuation of primary signal and therefore improve total signal to noise ratio. Simultaneous recording of greater bandwidth may be necessary for shallow reservoir targets or shallow velocity model building for depth imaging. Designing surveys that achieve both objectives is challenging and is particularly hampered by the effects of


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