Prediction of drilling trajectory (Geo-steering) is a challenge facing the drilling engineers to find the best suitable route, with maximum production and minimum obstacles. Shale are rocks that preserve high water content due to low permeability. That’s why shale patches are as intruder in clastic- oil reservoir where perforation of these thin layer shale patches can increase the water production and reduce the well productivity. This is the case in one of the oil fields in south Iran, which in this study we are trying to map the shale patches and bypass them during drilling or perforation. Using LMR technique and seismic attributes on pre-stack Seismic data and inverting the data we will be able to find proper rock physics model, elastic properties of rocks and evaluate lateral variations of lithology, i.e. Shale patches.