Abstract
The Pishvar anticline with Northwest-Southeast trend is located in the Sub-Coastal Fars area. This anticline with 80 Km length and 5 - 7 Km width is located in western part of the Lar area. The Pishvar anticline has two closures that are separated together by smooth down-warp. The oldest units that have outcropped on the surfaces are Asmari and Jahrom Formations. The most faults that observed on the Pishvar anticline are Normal fault. In the study area, the Razak and Hendurabi faults are main faults. These faults are strike slip with sinistral displacement. This anticline has greater dip in Northern flank compared to Southern flank. In this research, the main aim is folding style analysis, based on Description of fold geometry for indicate hydrocarbon trap structure in the Pishvar anticline. Description of fold geometry is important because they allow comparisons within and between folds and pattern-recognition in addition to occurrence and distribution of fold systems. We used Tectonics FP and Global Mapper Software for prepared some data in our study. In addition, we used the common classification of folds for our research. Based on results, the folding pattern of this anticline has indicated the fold style has different type in different parts of the Pishvar anticline. According to fold style variation and deformation analysis from B-B’ to C-C’ parts of the study anticline, it seems that the location of the Razak sinistral strike slip fault has existed in this parts. Fold style change can show this case. In addition, fold style variation and deformation analysis from E-E’ to F-F’ parts of this anticline has been affected of the secondary fault that is related to the Razak sinistral strike slip fault. We introduced this fault for first time. Finally, Based on results in this research, in western part there is little probability for access to hydrocarbon trap in upper horizons, unless the exploratory drilling continues to the deeper horizons.
Highlights
Middle East countries have 60 percent of the world’s oil and 40% natural gas reservoirs definitive reservoirs in the world
Because of enormous gas reserves Exists in the Permo-Triassic carbonate reservoirs of the Zagros Folded Belt, anticlines in this belt have the major significance from hydrocarbon traps reservoirs, especially in the Fars area
In other parts of this anticline, fold type based on classification of Ramsay [25], fold type is upright- sub horizontal. It seems that folding mechanism in the Pishvar anticline, it seems that from B-B’ to C-C’, the Razak fault has caused main changes on the fold style and maybe secondary fault that related to the Razak fault affected on the fold style and mechanism of folding
Summary
Middle East countries have 60 percent of the world’s oil and 40% natural gas reservoirs definitive reservoirs in the world. Because of enormous gas reserves Exists in the Permo-Triassic carbonate reservoirs of the Zagros Folded Belt, anticlines in this belt have the major significance from hydrocarbon traps reservoirs, especially in the Fars area. Based on obtained information from seismic reflection profiles and hydrocarbon exploration wells, the sedimentary cover has important detachment units between competent units in different parts of the Zagros Fold Belt. These detachment units have been controlled on the geometry and the folding style. Other researchers have discussed about this case too, e.g. [6]-[23]
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