Characteristics and effect factors of seismic velocity in metamorphic rock area:An example from CCSD borehole area;

This paper illustrates the relationship between synergetic acoustic logging velocity and seismic velocity by the theory of wave mechanics,and the exact interval velocity for structure mapping by variable velocity is computed.

Based on overlaying velocity data, mudstone thickness was predicted by using the rules of seismic wave velocity changes of itself and inherent relations between lithological properties, mudstone porosity was transformed by using interval velocity, thus vitrinite reflectance of source rocks was further predicted, therefore mature hydrocarbon source rock area was determined, and bases were p.

Because of large variation range on the seismic wave velocity and complex structure in Ciyutuo Oilfield,it s necessary to research the seismic wave velocity so as to offer accurate tectonic basis for geometric arrangement of wells.

Through the study of horizontal slice,slice along layer and vertical slice,it focused on the variation rules of seismic wave velocity vertically and horizontally in Jiangling Depression,and also analyzed the cause of horizontal change of seismic w.