Analysis of Effective Reservoir Structures Fractures on Borehole Unstability in Dezful Embayment, Zagros Fold Belt
Yaghub
Jalili
Department of Geology, University of Birjand
author
Mohammad Mahdi
Khatib
Department of Geology, University of Birjand
author
Ali
Yasaghi
Department of Geology, Tarbiat Modarres University
author
text
article
2015
per
In this Study, the effect of fractures on the anticlines of the Zagros folded as one of the most important factors of wellbore unstability at the reservoir wells of Asmari Formation located in the Zagros folded in Dezful Embayment has been studied. In this regard, fracture pattern were studied in three anticlines included Kuh-e. Asmari without faulting evidence (Type I), Kuh-e. Sulak affected by the thrust in Forelimb (Type II) and Kuh-e and Kamarab in the vicinity of the Izeh transverse fault (Type III). The information of fractures in the three anticline field & Satellite Images including Geometry, Frequency, Spacing, Intensity, Density and Length were studied during Field Studies and using Satellite Images. Moreover Comparison of parameters showed that the fracture concentration in several parts of the anticlines is different. The result showed that the maximum Density and Intensity of fractures found in Hinge area in type I, Faulted forelimb in type II and SE-Nose in type III anticlines. Therefore, maximum Lost Circulation and wellbore instability expected in Hinge, Forelimb and SE-Nose respectively from First to third anticlines. Therefore, due to direct relation between fractures concentration and drilling fluid loss, and wellbore unstability is increased in the aforementioned zone.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
1
12
https://aag.scu.ac.ir/article_11522_144b0afa953f0d6e8aa59738ef55cfcd.pdf
dx.doi.org/10.22055/aag.2015.11522
Investigating of Structural analysis and its Role in Mazandaran Fluorite Mines, Case Study of Kamarpusht and Sheshroudbar Fluorite Mines
Meysam
Tadayon
Department of Geology, Tarbiat Modares University
author
علی
ناکینی
فارغ التحصیل ارشد تکتونیک دانشگاه تربیت مدرس تهران
author
Mohammad
Mohajjel Kafshdooz
Department of Geology, Tarbiat Modares University
author
Nematollah
Rashidnejad Omran
Department of Geology, Tarbiat Modares University
author
text
article
2015
per
The Kamarpusht and Sheshroudbar Fluorite mines are located in west of central Alborz mountains. There are three Veresk member of Elika Formation (Middle Triassic), Paland Formation (Upper Triassic) and Shaly sediments of Shemshak Formation (Upper Triassic to lower Jurassic)in the mines areas.The Kamarpusht and Sheshroudbar Mines are located on Lamard and Sheshroudbar anticlines, respectively. There are two types of structural fabric for the fluorite concentrationdeposits as layer type and vein type. Stratigraphy location of layer type is at top of Elika Formation and below the Shemshak Formation. Layer type follows bedding attitude produced during anticline folding that characterizes the structural setting of the mines. Vein type mineralization is associated with main fault zones. The presented model could apply for all central Alborz fluorite deposits.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
13
23
https://aag.scu.ac.ir/article_11523_49f91eabf4e55e4353f06c4ac3e81014.pdf
dx.doi.org/10.22055/aag.2015.11523
Groundwater Quality Assessment using Takagi-Sugeno-Kant Fuzzy Water Quality Index (TSKFWQI) Approach
Salaedin
Kamrani
Department of Geology, Faculty of Earth Sciences, Kharazmi University
author
Mohsen
Rezaei
Department of Geology, Faculty of Earth Sciences, Kharazmi University
author
text
article
2015
per
In this study, the drinking groundwater quality of the Lenjanat plain, Iran, is classified based on Takagi-Sugeno-Kant Fuzzy Water Quality Index (TSKFWQI). In this research, physicochemical parameters including: As, Pb, Cr, Ni, Cu, NO3, Na, K, F, Cl, Ba, Ca, Mg, Fe, SO4 and TDS were used to calculate the drinking quality rank of water samples using TSKFWQI method. In this way 79 samples were analyzed for classification. Among these , 15.18% of the samples showed excellent water, 24.05% of the samples was good quality, 34.17% of the samples showed medium water category, 18.98% of the samples showed poor water category and 7.59% have poor water quality. In TSKFWQI, the final rank of any sample is very much affected by toxic parameters. It means that, a sample with acceptable range of all parameters, except one toxic parameter, falls in the unacceptable rank.Water chemistry shows the presence of some toxic elements in the groundwater resources, TSKFWQI classification of water with regard to drinking purposes gives more reliable results.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
24
32
https://aag.scu.ac.ir/article_11524_15a64aeca2c6e78e8da857e115e6bf3c.pdf
dx.doi.org/10.22055/aag.2015.11524
Mineral Chemistry and Melt Inclusions Study of Clinopyroxene Phenocrysts and its Application at Petrologic Interpretations and Mineralization: A case study of lamprophyre Dikes in Northwest of Iran
Azam
Soltanmohammadi
Geoloagy Department, Faculty of Earth Sciences, Shahid Beheshti University, Iran
Geoscience Environment Toulouse, Paul-Sabatier University, France
author
Mohammad
Rahgoshay
Geoloagy Department, Faculty of Earth Sciences, Shahid Beheshti University, Iran
author
Amir Morteza
Azimzadeh
Geoloagy Department, Faculty of Science, Zanjan University, Iran
author
text
article
2015
per
There is a close temporal and spatial relationship between calc-alkaline lamprophyres and gold mineralization. In Calc alkaline lamprophyre dykes in the Salavat mountain, northwest of Iran, silicate melt inclusions recognized as poly phase inclusions in clinopyroxene. They composed of glass, daughter minerals and volatile bubble. Melt inclusions compositionally are similar to those of host-clinopyroxene phenocrysts, which overlap with calc alkaline lamprophyres. Raman spectroscopy studies of shirinkiage bubble in melt inclusions show they are rich in volatile phase such as CO2. Combination of mineral chemistry data and melt inclusions indicate effect of fluids and its main role on metasomatism processes to generate parent magma of lamprophyres in the Salavate Mountain. Application of this study has significant importance to interpret related to upper mantle processes, evolution of alkaline magma and related mineralization.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
33
44
https://aag.scu.ac.ir/article_11525_d9e29e153011a0fd437569efecfc53f8.pdf
dx.doi.org/10.22055/aag.2015.11525
The Survey of Trajectory and Effects of Hendijan-Bahregansar Basement Fault in
Dezful Embayment
Esmaeil
Farahzadi
National Iranian south oil company(NISOC)
author
Abbas
Charchi
Department of Geology, Shahid Chamran University,Ahvaz
author
Mahmoud
Jamilpour
National Iranian south oil company(NISOC)
author
Ghasem
Saedi
National Iranian south oil company(NISOC)
author
text
article
2015
per
The Effect of Hendijan-Bahregansar Basement Fault (with Arabian trend) on Tango, Rag-e Sefid, Aghajari, Pazanan, Paranj, Parsi and Kuh-e- Bangestan anticlines was investigated using seismic profile, structural, stratigraphic and Field study evidences.Based on the present evidences, the Hendijan-Bahregansar fault has Arabian trend. The Arabian trend of fault can be a marker for its basement property. In this research, with present evidences, better pathway is obtained than older map for Hendijan-Bahregansar fault. Stratigraphic evidences in fields, deilling of the Bangestan reservoir, shows upper Cretaceous formations are absent or their thickness has decreased, because of basement fault activity and consequent regions uplifting during Sub-Hersinian event. In Parsi, Paranj and Kuh-e Bangestan that their Bangestan formations were not drilled, the fault activity was evaluated by structural evidences. So, bending of structures, moving of folds axial surfaces are controlled by cross and basement faults. In addition to stratigraphic and structural changes, this basement fault controls the condition of hydrocarbon production by creation of sedimentary changes in two sides of fault surface and also effect on trend and density of fractures in studied fields.
Highly change in thickness and facies reveals that factor controlling role on sealing efficiency property of Pabdeh and Gurpi formations (for Bangestan reservoir) in studied fields, as existence of this paleo high was caused to intensive reduction in cap rock formations (Pabdeh and Gurpi) thickness and change their ductile facies (shaly) to brittle facies (limy). Lack of sedimentary proportion thickness in two sides of fault surface was caused that the structure has no same response to pleistocene folding producting stress. This factor can be one of effective agents on folding morphology in basement fault pathway.in terms of applied. This reserch can be use in design of drillig direction and trajectory near the hendijan - bahregansar fault in the stadied fields.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
45
59
https://aag.scu.ac.ir/article_11526_f7bd36d883149d5c5524e8342585bccb.pdf
dx.doi.org/10.22055/aag.2015.11526
Evaluation of Morphometric Characteristics of the Zayandehrood River from Zayandehrood Dam to Zaman-khan Bridge
Elham
Davoodi
Faculty of Natural Resourses and Earth Sciences, University of Shahrekord, Iran
author
Alireza
Davoudian Dehkordi
Faculty of Natural Resourses and Earth Sciences, University of Shahrekord, Iran
author
Nahid
Shabanian Brougeni
Faculty of Natural Resourses and Earth Sciences, University of Shahrekord, Iran
author
text
article
2015
per
The study area is a part of the Zayandehrood River basin that start from Zayandehrood dam and extend to Zamankhan Bridge. In order to study the morphometric features, at first the area have divided to several sub-basins based on topography and drainage characteristics and then some morphometric features are measured including sinuosity, basin relief, ruggedness number, bifurcation ratio, compactness coefficient, basin elongation, drainage density, basin circularity and ruggedness number. The obtained results showed that in morphology, zayanderoud river, Zamankhan Bridge, Chaharmahal & bakhtiari.
the regions which are near to faults, form factor and basin elongation factor are low, whereas bifurcation ratio and basin relief are high. The regions which are lithologically susceptible to erosion, drainage density and ruggedness number are high. Finally, it can be concluded that the studied region is tectonically semi-active.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
60
71
https://aag.scu.ac.ir/article_11527_640e6afd239dece73051a6144c2ad2a4.pdf
dx.doi.org/10.22055/aag.2015.11527
Prediction of Sedimentary Features in Asmari Formation, SW of Iran: Using Electrofacies Analysis
Iman
Zahmatkesh
Department of Geology, Faculty of Earth Sciences., ShahidChamran University, Ahvaz
author
Bahman
Soleimani
Department of Geology, Faculty of Earth Sciences., ShahidChamran University, Ahvaz
author
Ali
Ghobeishavi
NIOC, Ahvaz
author
Hosein
Sheikhzadeh
NIOC, Ahvaz
author
text
article
2015
per
One of the most important elements in reservoir characterization is mapping of the features and heterogeneities of the reservoir. In heterogeneous carbonate reservoirsdue to presence of high complexity and heterogeneity, the porosity and permeability distribution is diverse and ambiguous. Accordingly, use of modern methods in improved assessment of these reservoirs would be essential. Among these approaches, identification and application of Electrofacies (Log Facies) has been considered as one of the most important methods in production of reservoirs as well as development of the Oilfields.The present work is devoted to utilize Self Organization Map (SOM) mode in neural network to clustering electrofacies of Asmari Formation in one of the oil field in southwest Iran. The Electrofacies reservoir quality shows that EF1 and EF5 appear to have the best reservoir characteristics, followed by EF2 and EF6. By contrast, Electrofacies 3, 4 and 7 show poor reservoir quality. Cited facies correlated with Petrographical features to relate carbonate and sandstone sedimentary fabrics with pore space size distribution and petrophysical characteristics of electrofacies in studied wells. Totally the defined facies show well correlation with petrography of the analyzed intervals and hence the electrofacies defined in this study could be considered as replacement of sedimentary ones and propagated to all wells of this field.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
72
81
https://aag.scu.ac.ir/article_11528_6ed738463f9cbd43ce80a952c845bb66.pdf
dx.doi.org/10.22055/aag.2015.11528
Mineralization,Alteration and Geochemistry in Surface and Exploration Drill Holes and Interpretation of IP/RS data in North of Mehr, Khash area, Birjand
Maryam
Javidi Moghadam
Department of Geology, Ferdowsi University of Mashhad
author
Mohammad Hasan
Karimpour
Research Center for Ore Deposits of Eastern Iran, Ferdowsi University of Mashhad
author
Mohammadreza
Haidarian Shahri
Research Center for Ore Deposits of Eastern Iran, Ferdowsi University of Mashhad
author
Azadeh
Malekzadeh Shafaroudi
Research Center for Ore Deposits of Eastern Iran, Ferdowsi University of Mashhad
author
text
article
2015
per
Mehrkhash area is located in eastern Iran, about 110 km North West of Birjand. The area comprises outcrops of Paleocene to Eocene volcanics, which was intruded by Quartz diorite sub volcanic body. The main alterations consist of propylitic, argillic and silicified- carbonate. The major mineralization in surface includes malachite, azurite, Iron oxides, covellite and chalcocite. Integrating the result of drilling with that of IP/RS data revealed thatmaximum geochemical anomalies and mineralization are in drill holes where high IP anomalies and low resistivity are located and is associated with argillic alteration and veinlet mineralization. Meanwhile drill holes with lower geochemical anomalies are in places where high IP and resistivity anomalies are situated and associated with mainly disseminated and less veinlet mineralization with silicified –carbonate alteration. The results confirm performance of IP/RS in the exploration of epithermal deposits that mineralization is observed as vein, veinlet and disseminated.
Advanced Applied Geology
Shahid Chamran University of Ahvaz
2251-7057
5
v.
2
no.
2015
82
92
https://aag.scu.ac.ir/article_11709_d6d7466f634cae890e6686e6fd052e87.pdf
dx.doi.org/10.22055/aag.2015.11709