Geographical Research

Morphometric characteristics of anticlines can play an important role in the exploration of oil resources. The purpose of this research is to evaluate the effect of geomorphology on the exploration of oil resources in oil-rich Bankol and oil-less Danehkhoshk anticlines by means of Geomorphological indices. To achieve the purpose of this study، topographic maps at a scale of 1:50000 and Geologic maps of the study area at scales of 1:250000 and 1/1000000 were digitized in ILWIS software and then geologic and topographic data were obtained. Morphometric of anticlines were extracted based on Quick bird Satellite images as well as field works. In this research، some geomorphological indices such as Aspect Ratio(AR)، Fold Symmetry index (FSI)، Fold front sinuosity (FFS)، Drainage Density( ) drainage pattern and triangular facets were used for differentiating tectonically active and inactive anticlines. Danehkhoshk oil-free anticline، with rectangle drainage pattern، higher rate of Aspect Ratio، Fold front sinuosity، Drainage Density and lower rate of Fold Symmetry index as well as with large triangular facets، is tectonically more active than Bankol anticline. This study represents that the lack of oil in Danehkhoshk can be explained by development of Neutral-Surface Folding mechanism. Development and compression of Danehkhoshk anticline has resulted in the downward movement of neutral surface and thereby progress and connection of extensional to compressional fractures، and then has allowed migration and escapement of oil recourses to the surface. Results of this study reveal that mentioned morphometric parameters are appropriate indexes for distinguishing oil bearing and oil less anticlines. Overall، it can be concluded that oil- less anticlines have tight and eroded morphology whereas oil bearing anticlines are younger، wider and less eroded.