Abstract:Given the classification confusion of influencing factors of seismic wave velocity, the influencing factors are systematically sorted and classified according to the dialectical theory of internal and external causes on the premise of a detailed analysis of the factors. It is pointed out that the mineral composition, structure, pore structure, porosity, and pore fluid type and saturation are the internal geological factors affecting the velocity. The temperature field, the pressure field, and the various physical and chemical fields related to diagenesis and metamorphism are the external environmental factors affecting the velocity. The relations of velocity with density, lithology, buried depth, geological age, and anisotropy are discussed, and it is concluded that it is inappropriate to take them as the influencing factors of seismic wave velocity in that there they have no essential connection with velocity change.
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