Analysis of fold -related fractures development and determination of in -si-tu stresses in the sarvak formation in one of thd west oil filds

Analysis of seismic sections perpendicular to the fold axis and draw the circles surrounding on this profiles indicate the more bending in forelimb due to the more uplift in sedimentary units in effect the compression performance and thrust faults that caused fractures development and density in the southwest limb. Increasing loss of drilling mud in the forelimb anticline wells is associated with development of tensile and longitudinal fracturs related to increase in shortening and anticline uplift, thrust faults propagation and create the duplex structures in near there wells. The maximum and minimum in-situ stresses directions in well No. 2 located in the medial part of anticline are respectively N50 and N140 which are dependent on the Zagros neogene folding. Tensile-indused fractures or maximum in-situ stress direction was inclined in the eastern part of anticline and showing N30E direction. Borehole Breakout or minimum in-situ stress direction is perpendicular to tensile frauture and has N120 orientation. In the southwest part of this anticline, UGC Map is showing that contours of similar thicknesses are inclined and respect to the adjacent anticline was sinistrally displaced. Very high drilling mud losses in well NO.4 located in fold southeast plange is due to the location of this well in minimum distance to strike slip fault trace between two anticlines and due to concentrated stresses resulting from dual intraction the northeast fault lineament releated from folding and operation the sinstral fault after the zagros neogene folding.