Converted wave AVO forward method of P-SV thin coal bed

Researched on the S-wave splitting phenomenon in the EDA medium, and based on it, deduced the converted wave reflection coefficient, built and did the P-SV converted wave AVO forward modeling on the coal measure strata model. The results show that when the incidence angle is 0, the thin layers' converted wave reflection coefficient is 0. As the incidence angle grows, it increases to a maximum value at first and then begins to decrease. The thickness of the thin layers has a great effect on it in the thin coal beds, and so are the fracture density and the filler of fracture when it is the large angle incidence. This influence has much to do with the background parameter of the isotropic of the EAD medium. The fracture's opening hardly affects the converted wave reflection coefficient of the thin beds.