تحليل هندسي و جنبشي تاقديس سلطان در كمربند چين خورده- رانده زاگرس و استفاده از آن در برآورد بستگي گروه دهرم

The Geometric and KinematicAnalysis ofSoltanAnticline in Zagros Fold-Thrust Belt; An Evaluation of the Dehram Group Closure

Soltan anticline is located in northwest of he Zagros fold-thrust belt in the Lorestan Province. Geometric and kinematic analyses of the anticline have been carried out tc estimate the closure of the Dehram Group in order to evaluate its potential for gas reservoirs. Geometric analyses of the Soltan anticline indicate that the fold geometry is rather similar to that of the Trishear type of fault propagation folds. However, consic ering the competency contrasts between various rock units in the anticline that control the foldʹs geometry. together with the rour ded and relatively wide outline of the anticline at surface, the Soltan anticline can also be compared to faulted detachment folds that hold the same geometry as the fault propagation folds. On the other hand, the very low values of finite strain measured on clastic rocks collected from the anticline and its typical smaller scale fold constraint, and the low values of the layer parallel shortening are comparable to the kinematics of fault propagation folds. Based on the data from the geometric and kinematic analyses, seven structural cross sections across the anticline are drawn. and using the cross sections, a structural contour mapanda 3D model tor Dehram Group areconstructed. The calculated values for theanticlineclosure prohibits this structure as an appropriate hostto gas reservoirs, unlessthe Soltananticline is connectedto theadjacent, Rit, anticline.