The Structural Geometry of the Aghajari Anticline on Marun Anticline using Seismic Reflection data (SW Iran)

Majority of Iran’s anticline oil traps located in the Dezful Embayment in southwest of Iran and Zagros Fold and Thrust belt. These anticlines mostly have NW-SE trend and their southern limb have a steep to returned dip. In some cases, thrust faults and steep south west limb of anticlines caused thrusting of adjacent anticlines on the others and repetition of sequence stratigraphy. The study area covered by Aghajari and Marun anticlines in Dezful embayment and the Aghajari anticline is thrusting on the Marun. In this research, structural geometry of thrusting of Aghajari anticline on the Marun anticline were studied based on seismic reflection data and specified the repetition of sequence stratigraphy. These two anticlines have a NW–SE trends and the Marun anticline is developing in the south of the study area, and most of deformation is concentrated in Aghajari anticline. The Marun anticline formed in the middle of the study area without thrusting, while maximum amount of thrusting of Aghajari anticline on the Marun anticline occurred in this area. There is a shallow thrust in the south limb of two anticlines in the northern part and an upper thrust from Gachsaran formation exposed from progressive deformation. Finally, a shallow thrust propagates to surface in the end of NW parts and back thrusts separate from main shallow thrust. But unlike Aghajari anticline, an upper thrust from Gachsaran formation propagates to surface with continuation of deformation in the Marun anticline showing low depth of the Marun anticline.