2.5-D Geometrical Spreading in a Layered Isotropic Medium Under Deep-Water Condition

Abstract

Abstract. Proceeding from the perspective of Physical Oceanography, we study the theoretical models and analyze the influence of marine channel and offset on the geometrical spreading compensation value. Concerning the long offset and deep water conditions during the geophysical exploration process, we put forward the 2.5-D geometrical spreading compensation technique to conduct more accurate amplitude restoration of the horizontal layered or seemingly horizontal layered medium. The method fully considers the geometrical spreading compensation and the marine channel outside the plane in the 2-D observation system to achieve optimal restoration of the amplitude. 2.5-D has small computational amount that can meet the real-time seismic processing requirement. The energy equilibrium analysis, synthetic and field data results suggest that the method can ensure the equilibrium of the seismic information energy of different underwater depths more properly, and improve the information reliability.