Application of DSI acoustic log to determine the geomechanical parameters of anisotropy and in situ stress orientation in carbonate reservoirs: a case study in one of the hydrocarbon fields of south-western Iran

Today, dipole shear sonic imager measurement is widely used in the oil industry and provides valuable data for seismic interpretation, structural evaluation, and mechanical applications of rock. The data used in this research are taken from SefidZakhour in Fars area. In this study, different applications of shear sonic imager processing modes and image log as a complement, was examined for geomechanical evaluation. To achieve the goal, the shear wave was first divided into two components, fast and slow and then the reservoir anisotropy was determined based on the energy difference. The results showed that at the depth bottom of the well, the minimum energy at minimum and the maximum energy at large. The areas of the well that are falling have more intense peak waves. Factors affecting the reflection of stoneley waves and the presence of Chevron pattern indicated that well wall falling are the most important factor influencing. By evaluating the results DSI and FMI in the field of in situ stresses, the maximum direction of maximum stress along NE-SW10 was determined. Also, the two maximum stress NE-SW45 and SE-NW45 were in accordance with the maximum stress in Zagros.