Behnam Rahimi - Academia.edu (original) (raw)

Papers by Behnam Rahimi

Marine and Petroleum Geology

Well, seismic (2D and 3D) and AHe age data, complemented by field surveys, were analyzed with the... more Well, seismic (2D and 3D) and AHe age data, complemented by field surveys, were analyzed with the objective of investigating the tectono-stratigraphic evolution of syn-and post-rift sedimentary basins in the eastern Kopeh Dagh Belt (NE Iran), a region well known for its important oil and gas occurrences. The study was focused on evaluating how and when the geometry of syn-rift structures influenced the development of the post-rift sedimentation. Our results show that the Middle Jurassic rifting stage influenced the geometry of the post-rift basins. Carbonate buildup of the Upper Jurassic (Mozduran reservoir) was formed in the low relief accommodation zones between the Middle Jurassic opposing half-grabens in parallel to the sedimentation of argillaceous carbonates within the adjacent troughs. This geometry was also transmitted to the Lower Cretaceous, affecting the deposition of a relevant siliciclastic system (Shurijeh reservoir). The role of rifting was crucial in the distribution of reservoir facies and the generation of the structural-stratigraphic traps in the study area, which were also affected by late tectonic inversion. Uplift and denudation is likely to have occurred up to Late Miocene.

Journal of the Geological Society of India

This study provides a description and statistical analysis of fold-related fractures in the Khur ... more This study provides a description and statistical analysis of fold-related fractures in the Khur fold, northeast of Kopet Dagh fold-and-thrust belt, Iran. Kopet Dagh fold-and-thrust belt, as a part of Alpine-Himalaya orogeny belt in west Asia, forms the northeastern boundary of Iran plateau. In this study, the remote sensing technique was utilized to map and statistically analyze the lineaments on the satellite images. Extraction of fractures is based on the processing of satellite images and completed by field observations. Based on their directions, fractures can be categorized into four sets including an axial and a cross-axial set that trend parallel and perpendicular to the fold axial trace, respectively, and two oblique sets that trend at moderate angles to the axial trace. The mean trends of the principal compressional stress, independently calculated for the fold-related fractures systems, are close to N41° ± 5°E and are perpendicular to the general NW-SE trend of the Kopet Dagh fold-and-thrust belt. The cross-axial set is interpreted as the oldest set. The major orientation of lineaments is NE-SW. Also, the length distribution of fractures shows a right-skewed distribution. To extract the underlying scaling parameters, the dataset was analyzed using Maximum Likelihood Estimators (MLEs). It was found that a lognormal distribution is the best representative statistic for fracture lengths in the study area. The combination of information from the prepared fracture map, the analysis and measurement of the fractal dimension, and calculations of variables such as density and intensity revealed that the high probability of permeability along with fractures with an NW-SE trend.

Iranian Journal of Geology, Apr 1, 2019

TURKISH JOURNAL OF EARTH SCIENCES, 2021

* Correspondence: ahad.nouri@mail.um.ac.ir

Iranian Journal of Earth Sciences, 2021

A total of 324 strong ground-motion records from 26 earthquakes with moment magnitude greater tha... more A total of 324 strong ground-motion records from 26 earthquakes with moment magnitude greater than 6 were used to derive an adequate equation for moment magnitude estimation. A parameter called total effective shaking was used to introduce an empirical equation for determining the near real-time magnitude of the Iranian plateau. This parameter was obtained through time integration of the absolute acceleration values from accelerograms over the strong shaking duration. It can be calculated by a simple mathematical procedure 5 seconds after completion of the waveform by decreasing the amplitudes to less than 20% of the maximum ground acceleration. The total effective shaking has a dimension of velocity and corresponds to moment magnitude and hypocentral distance in an attenuation relationship. The optimum coefficients were calculated through least-square regression analysis. Also, the effect of site conditions was evaluated in the analysis. The average shear-wave velocity to a depth o...

Petrology, 2019

In the northeast of Iran, there are some outcrops of high-Mg ultramafic volcanic rocks. These roc... more In the northeast of Iran, there are some outcrops of high-Mg ultramafic volcanic rocks. These rocks have been interpreted as an ideal ophiolite sequence related to the closure of Paleo-Tethys. According to detailed field observations, the komatiitic lava flows in Shandiz- Virani- Mashhad Complex (SVMC) and Fariman Complex (FC), are interlayered with the Upper Paleozoic submarine turbiditic sediments (Carboniferous-Permian). These rocks have a wide range of volcanic facies and according to the lithofacies characteristics, are divided into three groups of differentiated, undifferentiated lava flows and pillow lavas with a variety of volcanic textures and glass groundmass and with the main minerals of olivine, chromian spinel, clinopyroxene and amphibole. In this paper, the komatiitic nature of these rocks has been proven by explicit evidence from the field characteristics, petrography, internal stratigraphy and mineral chemistry. Also, the interaction of a mantle plume with the late P...

Journal of Economic Geology, 2019

Introduction The Mashhad- Virani complex has been sandwiched between the collided Lut block and T... more Introduction The Mashhad- Virani complex has been sandwiched between the collided Lut block and Turan plate. This complex is composed of the following four units: 1) ultramafic-mafic rocks, 2) metamorphosed sedimentary rocks, 3) pyroclastic rocks and 4) Mashhad's granitoids including quartz-diorite, tonalite, granodiorite and monzogranite (interpreted as granitoids formed in an arc regime during the subduction of the Paleo-Tethys Ocean under the Turan Plate by Karimpour et. al., 2011). The association rocks in the Mashhad-Virani complex have experienced varying degrees of hydrothermal alteration and regional metamorphism. These rocks are typically metamorphosed in lower to upper green-schist facies, but rarely to pyroxene hornfels facies along the contacts with the Mashhad granitoids. Researchers have challenging ideas on the nature of these rocks. Firstly, Majidi (1981) reported the komatiitic nature of these rocks. However, most of the geologists believed that these rocks are ...

Journal of Economic Geology, 2020

Introduction The investigated area in northeastern Iran that is known as the Tarik Darreh arsenop... more Introduction The investigated area in northeastern Iran that is known as the Tarik Darreh arsenopyrite-Au-W prospecting target is situated in the Kopeh Dagh zone (Fig. 1). Most of the study area is covered with black slate rocks which most authors have referred to as Upper Triassic with Norian age (e.g., Behroozi et al., 1993). Plutonic rocks with gabbro, diorite, and quartz diorite and monzodiorite composition were introduced in the slate rocks. The previous studies in the Tarik Darreh are the preliminary report of arsenopyrite with Au-W quartz lode mineralization carried out by Taghizadeh (1965). Since then, the Geological Survey of Iran (e.g., Alavi Naini and Mossavi-Khorzughi, 2006) a few geologic companies and the universities (Shafi Niya, 2002) and Ghavi et al. (2013) have been studying in the area. In the present study, we provide more information, complete with new information about the geology of the Tarik Darreh area. Materials and methods Expansive field geology surveying...

Developing1 natural convection gaseous flows in an open-ended parallel plate vertical microchanne... more Developing1 natural convection gaseous flows in an open-ended parallel plate vertical microchannel with isothermal wall conditions are numerically investigated to analyze the rarefaction effects on heat transfer and flow characteristics in slip flow regime. The Navier-Stokes and energy equations are solve by a control volume technique subject to higher-order temperature jump and velocity slip conditions including thermal creep effects. The flow and thermal fields in the entrance and fully developed regions along with the axial variations of velocity slip, temperature jump, and heat transfer rates are examined in detail. It is found that rarefaction effects significantly influence the flow and thermal fields such that mass flow and heat transfer rates are increased considerably as compared to the continuum regime. Furthermore, thermal creep contribution to the velocity slip is found to be dominant close to the channel inlet and vanishes in the fully developed region, while velocity s...

Journal of Structural Geology, 2022

Journal of Tourism and Hospitality, 2014

Considering expansion and improvement of information technology and communication, the modern wor... more Considering expansion and improvement of information technology and communication, the modern world has entered a new stage called global village. It has caused millions of tourists visiting cultural-historical, social, and eco-tourist places every year. Among these places, Shiraz for having strong tourism potentials; like: Hafeziye, Sa’diye, Zand collection, Persepolis, succulent gardens, etc.; has been in a unique and worthwhile position. So this city as one of the important points welcomes a lot of tourists from various countries around the world. This study has been done through survey. There must be enough tourism facilities such as: staying, reception, and infrastructure facilities; like: parking, etc. to attract tourists, and the hypothesis of this study was that the tourism facilities in Shiraz were not enough and responsive to a lot of tourists visiting the city in Nowruz holiday and did not provide their satisfaction. Parking shortage, lack of appropriate guidance, lack of...

Sefidsang area is located 70 km to south east of Zahedan. This area is located in the eastern Ira... more Sefidsang area is located 70 km to south east of Zahedan. This area is located in the eastern Iran flysch zone. It has been composed of Ophiolithic rocks and Flysch sediments. Zahedan granitoides of Oligocene age have intruded in these rocks with a NW-SE trend.It within shear zone lies structurally that is among two strike-slip fault (Zahedan and Nosratabad) in east and west respectively. The Zahedan fault with > 150 km length, almost NS trend and reverse component is strikeslip. The Nosratabad fault with < 200 km length, NW-SE trend and reverse component is strike-slip. The lithic units of this area have been influenced by NE-SW trending of joints and faults. Sampling was considering factors such as stratigraphy, lithology, tectonic and alteration zones. The 60 lithogeochemical samples after preparation were analyzed by AAS method. For 6 selective elements (Au, Ag, Cu, Pb, Zn and As) factors such as frequency distribution, background, threshold, anomaly, enrichment index and ...

Cumhuriyet Science Journal, 2015

Jahrom plain is located in Fars province that is one of subbasins of Mond river.The cachment area... more Jahrom plain is located in Fars province that is one of subbasins of Mond river.The cachment area is 1016 square kilometers. In recent years due to drought, the groundwater level in this basin has declined so much during the statistical period, 14.7 meters has dropped. In this research by using rainfall and drought index, dry and wet periods specified and compared with groundwater level changes. The times of drought due to reduced rainfall and increased withwards from groundwater resoures, water levels of alluvial aquifer dropped so that the plains have been banned. Plain waterbalance calculations also show that the difference between recharge and discharge of water in this plain is -27 million cubic meters. Thus enabling the development of water resources in the alluvial aquifer is plain.

Iranian Journal of Earth Sciences, 2018

The geometric and kinematic analyzing of the anticlines and their relation with the large-scale s... more The geometric and kinematic analyzing of the anticlines and their relation with the large-scale structures are used to determine the structural evolution of the area. The Dorbadam anticline is located in the Kopet-Dagh structural zone, 45 km due north of Quchan and on the Razavi and North Khorasan provinces border. The field study and geometric analysis indicate that the Dorbadam anticline has two culminations with an en-echelon arrangement and different structural evolution. The NW culmination (DA.1) is analyzed as a fault propagation fold geometry, while the SE culmination is known as a simple folding. The axial trend of the Dorbadam ant icline has been changed and shows harmonic and Horizontal inclined, 1C subclass of Ramsay's classification, close, asymmetrical over fold in DA.1 part; upright and horizontal, open and symmetrical upright fold in DA.2 part. Aspect ratio on the Dorbadam anticline is 0.64 and has a parabolic appearance. The joint study revealed the existence of ...

his study presents a petrological and geochemical characterization of the Early-Middle Devonian s... more his study presents a petrological and geochemical characterization of the Early-Middle Devonian sandstones of the Padeha Formation in SE Central Iran, north of Kerman in order to determine the provenance on the basis of two measured stratigraphic sections. The sandstones are classified as quartzarenite and sublitharenite, and subordinately as litharenite based on framework composition. Modal analysis data from 55 samples of the Sarashk and Gazuieh sections revealed that the sandstones contain quartz, a few percent feldspars and lithic fragments (sedimentary and volcanic rocks). Most of the quartz grains are monocrystalline with straight to undulate extinction with a few polycrystalline grains. Petrographic studies indicate that the Padeha Formation sandstones may have been derived from plutonic and other recycled orogen rocks. Chemically, the major oxides of the sandstones from the Sarashk section are depleted with respect to the upper continental crust, except SiO2, which is relate...

A high-order macroscopic model for the accurate description of rarefied polyatomic gas flows is i... more A high-order macroscopic model for the accurate description of rarefied polyatomic gas flows is introduced based on a simplified kinetic equation. The different energy exchange processes are accounted for with a two term collision model. The order of magnitude method is applied to the primary moment equations to acquire the optimized moment definitions and the final scaled set of Grad’s 36 moment equations for polyatomic gases. The proposed kinetic model, which is an extension of the S-model, predicts correct relaxation of higher moments and delivers the accurate Prandtl (Pr) number. Also, the model has a proven H-theorem. At the first order, a modification of the Navier-Stokes-Fourier (NSF) equations is obtained, which shows considerable extended range of validity in comparison to the classical NSF equations in modeling sound waves. At third order of accuracy, a set of 19 regularized PDEs (R19) is obtained. Furthermore, the terms associated with the internal degrees of freedom yiel...

چکیده در این تحقیق با استفاده از روشهای سنجشازدور و پردازش دادههای ماهوارهای، سیستمهای شکستگی... more چکیده در این تحقیق با استفاده از روشهای سنجشازدور و پردازش دادههای ماهوارهای، سیستمهای شکستگی منطقه اخلمد رسم و در مرحله بعد الگوی فراکتالی آنها مورد بررسی قرارگرفت. در اینجا با توجه به مورفولوژی مرتبط با گسلش از چند تکنیک مختلف برای بارزسازی گسلها و شکستگیهای موجود در منطقه استفاده شده است. جهت مطالعه محدوده مورد نظر از دادههای SPOT5، ETM+Landsat و Aster استفاده گردید. جهت داشتن توان تفکیک مکانی بالاتر، باند Panchromatic، با تصاویر ETM+Landsat تلفیق گردید. سپس این دادهها با هدف بارزسازی خطوارههای تکتونیکی،قطعشدگیهای ناگهانی لیتولوژی و جابجایی ناشی از گسلشبا استفاده از نرمافزارهای ER Mapper ، ENVI وArcGISمورد پردازش قرارگرفت. همچنین از روشSunshading برای شناسایی ناهمواریهای ناشی از گسلها برروی دادههای DEM منطقه مورد استفاده قرارگرفت. در نهایت با استفاده از تصاویر حاصل از تکنیکهای مذکور نقشه شکستگیهای ساختاری منطقه ترسیم شد. در مرحله بعد، الگوی فراکتالی حاکم بر شکستگیهای ساختاری منطقه به روش مربع شمار انجام شد؛ که برای این منظور منطقه مطالعاتی را به 94 محدوده مجزا...

$Research paper thumbnail of Evolution of N-S trending fractures in Khajeh Morad Leucogranite, southeastern Mashhad, NE Iran$

Geosciences Journal, 2021

In the southern part of the Kopeh Dagh basin, NE Iran, outcrop of the Kardeh fault damage zone in... more In the southern part of the Kopeh Dagh basin, NE Iran, outcrop of the Kardeh fault damage zone in Mozduran carbonate formation provides an opportunity for investigation of the impact of faulting on permeability and porosity. For this purpose, three methods were focused on: 1) gas injection in oriented cores prepared parallel and perpendicular to fault strike and parallel to fault dip, 2) microscopic analysis and 3) determining variation of the degree of fractures connectivity in the fault damage zone. Results of tests show air-porosity and air-permeability increase from fault core toward host rock. Using microscopic studies, we attribute these variations to bioclasts destruction and filling, precipitation of calcite cement in fractures and pores, development of compaction structures such as stylolites and particle abrasion. Analyzing variation of the fractures connectivity in the fault damage zone in macro-scale shows degree of connectivity increases from host rock toward fault core (Y and X nodes). Clear dependence between this parameter and fluid flow is reflected by connected linear springs developed in the damage zone in close proximity to the fault core. Results of this study show that permeability in a fault zone is a scale dependent feature.

Environmental Earth Sciences, 2021