سعید زارعی

The Zagros Fold and Trust belt with ~1200 km length and numerous hydrocarbon reservoirs as tectonically active area has been studied by many geologists and seismologists. The tectonic regime in the Zagros orogeny is affected by the convergence of the Arabian and Eurasian plates, which causes many earthquakes each year with a mostly reverse mechanism in this region . The severe and complex folding that are characteristic of this region have made it difficult to study the behavior of geological layers and deformation of the region.One of the major complications of the region due to this convergence is the emergence of the deformities of the anterior and posterior. In-situ stress measurement in areas of valuable underground reserves is necessary for modern geophysical studies of hydrocarbon reservoir. Several parameters were considered in exploration and operation of hydrocarbon reservoirs such as Stability analysis of wellbore during drilling, casing failure during harvesting , various methods of increasing production, determining the proper direction of directional wells, etc. are. Horizontal components of the tension caused by the movement of the Arabian plate gradually cause the wall pipes to crumble and impose huge costs on the operating companies. To determine the direction of in situ stress, there are methods such as tectonic methods, physical ground methods and instrumental methods.In this study, dominant directionthe of tectonic stresses caused by tectonic behaviors under the influence of shell convergence in the southwest of Iran have been estimated by using the focal mechanism of occurred Instrumental earthquakes and have been analyzed by WinTensor software . For this purpose, the focal mechanism of systemic earthquakes that have occurred in the region has been used. Although the major depth of exploratory wells does not exceed a few kilometers, it can be expected that sediments overlying bedrock or surface sedimentary layers will be affected by creep and su