Abstract
The synthetic seismograms for the fractures in Chap. 3 suggest that the fractures are also reflection generators for reflecting waves propagating in the media. Consequently, the recorded surface seismic data inevitably contain fracture reflections when the acquisition reservoir contains fractures. In this chapter, we derived new PP- and PS-wave reflection and transmission coefficient equations based on the principle of nonwelded boundary conditions. The new AVO equations for the horizontally fractured medium with impedance contrast are finally presented. In the new AVO equations, the reflection coefficients are divided into a welded contact part (a conventional impedance contrast part) and a nonwelded contact part (the fracture part) which makes them flexible for truly inverting for the rock properties of the fractured medium with impedance contrast.
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