List of Articles Modeling

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  1 - Study of North West Sedimentary Basin of Iran by 3D Modeling of Gravity Data
  Mojtaba  Tavakoli Ali nejati
  Inversion of the gravity data is one of the most interesting numerical tools for obtaining three dimensional geological images. In this paper 3D nonlinear inversion of the gravity data is used to determine the basement topography. The basement was juxtaposed with the re More

  Inversion of the gravity data is one of the most interesting numerical tools for obtaining three dimensional geological images. In this paper 3D nonlinear inversion of the gravity data is used to determine the basement topography. The basement was juxtaposed with the regular array of rectangular prisms in which the thickness of each prism is determined by the inversion procedures. Prepared algorithm is based on singular value decomposition (SVD) method which ca modify the initial model by comparing observed and estimated gravity data. The SVD method is very popular with geophysical data analysts because it is mathematically robust and numerically stable. To illustrate effectiveness of the prepared codes and algorithm related to 3D inversion of gravity data, both synthetic and real data were tested by the mentioned algorithm. The real data were part of the gravity data which were acquired in Moghan area (located in the north-west of Iran). Because of being near to the Baku oil-rich regions and thick sedimentary rocks, the Moghan sedimentary basin is an interesting area from hydrocarbon exploration point of view. Determination of the sedimentary rocks thickness is an important factor in oil and gas exploration issues. The main goal of 3D inversion of the gravity data in the study area is to determine basement the sedimentary rocks thicknesses or the boundary of Ojagh-Gheslagh Formation and its volcanic basement. The modeled boundary of Ojagh-Gheshlagh Formation and its volcanic basement which is obtained by the inversion of gravity data, was previously confirmed by interpretation of seismic data. Manuscript profile
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  2 - Mechanism of young deformation in Tehran plain: a combination of field observation and analog modeling
  Hourieh AliBeygi Morteza Talebian Manouchehr Ghoreshi
  The capital city of Tehran is located to the south of central Alborz. The North Tehran fault, as the main structure of this region, perched on the northern part of the city and separate alluvial fans from volcanic rocks of the Alborz. There are several other faults w More

  The capital city of Tehran is located to the south of central Alborz. The North Tehran fault, as the main structure of this region, perched on the northern part of the city and separate alluvial fans from volcanic rocks of the Alborz. There are several other faults within the city which seem to be structurally related to the North Tehran fault. Geomorphic study of fans and river deposits suggest that most of these faults are active and taking up both left-lateral and shortening in a wider zone to the south of North Tehran fault. In addition to faults there is distinct folding within the Tehran plain. Field observation along road cuts which cross these structures suggest that young folding in Tehran plain are active and escalate due to the activities of the underlying faults. There is little evidence of rupture in front of these structures and thus most of them are considered as blind faulting. The trend of these structures is oblique to the North Tehran fault which is probably due to distribution of left lateral deformation in wider zone within the Tehran plain. The distance between active folds and the North Tehran fault increase from west to east. Analog modelings were carried out to study the effect of thickness and slop of deposits on position and trend of structures within the Tehran plain. Results from these experiences show that geometry, orientation and distance between structures is probably controlled by oblique shortening of the zone, as well as increase in thickness and slope of the sedimentary deposits. Manuscript profile
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  3 - Modeling of the fold interference patterns from the northern Golpaygan metamorphic complex using MATLAB
  Mohammad Reza Sheikholeslami
  20.1001.1.17357128.1400.15.58.6.0
  Modeling of geological structures plays an important role in understanding the geometry of the structures and their relationships. In recent years, digital modeling using computers has attracted the attention of engineers as well as researchers in basic sciences. "MATLA More

  Modeling of geological structures plays an important role in understanding the geometry of the structures and their relationships. In recent years, digital modeling using computers has attracted the attention of engineers as well as researchers in basic sciences. "MATLAB" is one of the softwares that is used with its extensive facilities for data analysis and modeling in various sciences, including structural geology. In this paper, possible models of interference patterns of the three generations of folds in metamorphic rocks of the Golpayegan area were reconstructed using the script written in MATLAB software. The required data include the attitudes of the mean axis and the mean axial planes of three consecutive generations of folds which were obtained during field measurements. Field studies show that the first and second generation folds are almost coaxial, however the third generation folds have a different axial trend. The results of modeling indicate that four classical fold interference patterns may be formed in horizontal (map view) and vertical sections in Golpayegan metamorphic rocks. Modeled fold interference patterns are closely consistent with the natural fold interference patterns observed in the outcrop and regional scales. Using the modeling, it can be determined that the different interference patterns of the folds in the northern Golpayegan metamorphic rocks are related to superposition of the related fold generations. Manuscript profile
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  4 - Exploration analysis and determining the relationship between mineralization and faults as a new exploration key in the Sirjan-Beshneh copper deposit
  Reza Ahmadi S.J. Hosseini Shahraki
  20.1001.1.17357128.1401.16.63.5.6
  Sirjan-Beshneh copper deposit with 0.5 kilometer area is located in Kerman province 80 kilometers west of Sirjan city. The variety of exploration activities including remote-sensing, field traverses, geophysical explorations, surface explorations comprising surface samp More

  Sirjan-Beshneh copper deposit with 0.5 kilometer area is located in Kerman province 80 kilometers west of Sirjan city. The variety of exploration activities including remote-sensing, field traverses, geophysical explorations, surface explorations comprising surface sampling and geochemical analysis of 94 samples, drilling and surveying three trenches with sampling and analysis of six samples as well as drilling of eight deep exploration borehole with the total length of 414.5 meter, have been carried out in the metallic deposit. All faults in the region were mapped based on the remote-sensing and structural geology operations of the region. In the present research, all exploration activities carried out in the Beshneh copper deposit were analyzed through investigating their relationship with the faults in the region. To achieve this goal, various techniques including drawing rose-diagram of faults, processing of resistivity and chargeability data of rectangle survey and smoothed inversion of data for five dipole-dipole profiles, imaging isograde maps for the surface and trench samples as well as 3-D modeling of exploration boreholes assays of the region were employed. The results showed that locations of mineralization related to the fractures and faults present in the region since the trend of most mineralized veins is along the main faults. At the end, in order to complete the explorations of the previous stages to get a better recognition of the deposit, drilling of several new exploration boreholes was proposed based on all performed studies and integrating obtained results as an exploration key.. Manuscript profile
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  5 - Effect of water seepage and dissolution on the stability of Neyshabur bar dam
  M.T. Karbasi Maroof HamidReza Nasseri Farshad Alijani
  20.1001.1.17357128.1402.17.65.2.4
  Bar dam has been constructed in northwest Neyshabur city, off-stream Bar river to provide the urban drinking water and Neyshabur steel factory water demand, respectively. The water balance of the Bar dam has indicated 35-70% water seepage from the dam reservoir during More

  Bar dam has been constructed in northwest Neyshabur city, off-stream Bar river to provide the urban drinking water and Neyshabur steel factory water demand, respectively. The water balance of the Bar dam has indicated 35-70% water seepage from the dam reservoir during six trial water intakes. The significant seepage, high concentration of solutes in the leaked water, impact on water resources planning and projected allocations threaten the stability of the Bar dam. Analysis of the observation wells hydrograph indicated major water seepage from the central part of the foundation of the main dam site and minor seepage from other areas. water seepage modeling using MODFLOW software showed that 75% of the volume of the leaked water passed through the foundation of the main dam site. Furthermore, the chemical analysis of the leaked water samples indicated an increase in total dissolve solids to more than 5 to 10 times, especially in the central and left areas of the dam reservoir. The amount of the dissolved material due to water seepage from the main dam site was calculated based on the data collected from the modeling of water seepage from the dam reservoir, results of hydrochemical sampling, time series analysis of the seepage rate, and mass balance of the dam reservoir water. Finally, the effect of dissolution on the increase of porosity was investigated and based on the results,the maximum annual development of porosity in the middle part of the main dam axis was about 0.06%. Manuscript profile