Since the most of the fractures have an important role in the emplacement and guidance of hydrocarbons, therefore, lineations study is important to investigate the pattern of fractures and their relationship with folding and faulting. lineations often are main fractures near the surface of the earth, typically identify and interpret of fractures, is done by using of ground surveys and aerial photographs. Since the aerial photographs are not able to provide an integrated vision of the region in vast areas, therefore in some cases, in addition to spend the time and much cost for lineations and faults mapping, effects have not been identified to be accurate and complete. This research was performed with the purpose of surface fractures mapping and lineaentions area and a geometric interpretation of the fractures that are within the three oil fields Kheirabad, Chylengar and Garangan in southern Dezful fall, by using of remote sensing and Landsat data. Due to the broad area and various structures, 10 networking was drawn, that structure be separated each other. Fractures categories in field area and surface anticline show that most fractures has NE_SW trends and Perpendicular to the axis of the anticline, and are the tensile-type fractures. The results show that presence of fractures in surface and their density are related to position of folds and faults, in study area. Relatively high density of fractures that relates to Chylengar and Garangan anticlines show that most fractures are associated with folds as well as are influence of Khark-Mish basement fault. and also due to the location of wells in study area, according to density fractures in the surface can be achieve to reliable results for determination of suitable location for well. Presence of twelve wells in areas with a high density of fractures and one well in low-density areas, shows that can be considered a direct relationship between fracture density and location of the wells. Oil wells in the region are coincident with areas with a high density of fractures which can be used in the exploration and development of hydrocarbon reservoirs within central and south-eastern parts.

 Ahvaz fault is a main thrust fault in Khouzestan province. Its geological
and structural location is in Zagros thrust belt zone and in Dezful
imbayment border with Abadan plain. It is introduced as a segment of
Zagros foredeep fault (ZFF). Due to its location in Ahvaz city, it is too
important to study the structure and seisimicity of Ahvaz fault. According
to this study, the Ahvaz thrust fault has three structural segmantation that
respectively named AhzF1, AhzF2 and AhzF3. Seisemicity and structral
features of these segmentations have been determined in the study that
showes the AhzF1 is seisemicaly more active than the other Ahvaz
segmentations. Therefore Ahvaz fault offered as a fault system that has two
parts. The shallow part and the basement part. The Ahvaz shallow part
cuases thrusting Aghajari formation on recent deposits, but the basement
part in compare with the shallow part is more active seisimicaly.

Naftsefid oil field located in the center of Dezful embayment, Zagros trust belt, SW Iran. Trend of this field follows the Zagros general trend. Fractures in the carbonate reservoirs are important due to their high influence on reservoir properties such as porosity and permeability, also they could be used for determine the best drilling method and intervals. Prediction of hydrocarbons movement pattern in fracture reservoir is so challenging process due to complicated fracture network and heterogeneity of carbonate rock. For some uncertainties discrete fracture network (DFN) models were constructed for “Field Naftsefid”. Fracture parameters such as intensity, size, shape, and orientation are assigned to each fracture based on measured data or relevant statistical distribution derived from the measured data. In this study, structural analysis and three dimensional modeling of fracture network (DFN) were done in the Asmari reservoir.
For structural interpretation, UGC and basement maps of Dezful Embayment with bedrock lineament were used. NaftSefid anticline is an asymmetric fold which related to thrust fault. Also this field is combination of two folding mechanisms (wrinkling and fault propagation).There is a recirculation on the left of anticline. Based structure analysis, a shear zone has been identified in this oil field. This field is a sinistral shear zone with some strike-slip faults. There is an anticline axial bend in the north west section, which some fracture systems such as R, R’ and p confirmed this point. In this study, we tried to determine a model for shear zone in the Naftsefid anticline.
Finally open fractures (direction and classification of them) were determined. Discrete fracture network model was made using data layering, fractures dip and trend which they determined using image logs. Fractures density log shows the zones with most fracture density around the faults and anticline’s top. Intensity map of fractures and porosity model confirm this point.
Based on the model of fracture length, maximum fracture length observed in the near of faults (800 m) and the minimum of fracture length was calculated for the anticline flanks (away from faults). All fracture parameters directly related to the faults especially fracture aperture.
 

Balarud fault zone is located in the West Zagros fold-thrust belt between two of the Lurestan and Dezful embayment zone. Due to the importance of the Balarud fault zone in the structural framework of the Zagros and the occurrence of recent earthquake within this area, active tectonic analyses are mainly consisted of structural, morphotectoic and seismic studies. In active tectonic analysis of an area, investigating of structural characteristics is very important. In this study moreover to study of active tectonic of the Balarud zone, other structural analyses considered such as orientation varies of the major and minor structural features. Structural analysis of the study area revealed that the Balarud fault zone acted, as a transpression tectonic with en-echelon structural pattern. The results of morphotectonic and seismic analyses, show that the Balarud fault zone act as an active tectonic zone. Western, central and eastern parts of the Balarud fault zones wis divided to, high active tectonic, middle active tectonic and low active tectonic zones, respectively