Using approaches and methods for a low-risk drilling and also the decreasing of the oil and gas production expenditure is considered by researchers and industry in recent years. The objective of this thesis, furthermore, is investigation of lithology variation and Dynamic Static Characterizations in Reservoir Rock (Asmari) by prosseced seismic waves (VSP) and sonic log. Firstly, shear wave in different depths was calculated by using of empirical equations of the Castagena and Han that obtained by laboratory approaches with respect to compressive wave speed. By using seismic waves and ratio between them, top formations were determined.Then, Density values have been estimated in order to obtain elastic parameters from surface to ultimate depth on the basis of linear regression. Accordingly, density and waves speed were used to estimate elastic parameters. Secondly, the LMR parameter was also determined for various depths using multiplying shear and lama modulus by density. As a result, the reservoir rock was divided to seven zones by LMR parameter in order to introduce pay zones to perforate as well as top formations to prevent forthwith entrance. To correct VSP data, FDC and BHC logs have been used. In this study, using elastic parameters, p-wave speed and empirical equations the dynamic Young , s modulus was converted to static Young , s modulus and then uniaxial compressive and tension strength were calculated. Finally, Eaton method was used to estimate pore pressure. The study showed that from surface to final depth, on the basis of shear and compressive wave’s speeds, the most important lithologies were sandstone, marl, anhydrite and salt and limestone. Shear/Compressive ratio is also apt in order to determine formations. The recent state showed that the ratio was clearly in the border of Mishan and Aghajari Formations. Decreasing in shear modulus, because of crummy property of marl, is a significant cause for recent variation. The result has also showed that regression can be the best method to estimate density values. On the basis of LMR parameter, the reservoir was ltr"
