ORIGINAL_ARTICLE
Provenance, Tectonic Setting & Geochemical Maturity of The Early Miocene Pyawbwe Formation, Sakangyi –Thayet Area, Magway Region, Myanmar.
Abstract The best exposed Early Miocene (820 m. thick. ) shales and interbedded silty sandstones beds of the Pyawbwe Formation at Sakangyi- Thayat area,Magway Region are investigated geochemically by using Siemens SRS- X Ray 303 AS XRF Spectrometer. Major and some trace element concentrations have been determined to achieve their provenance, tectonic setting ,paleoweathering , paleoclimate and sedimentation characteristics. The geochemistry of sediments is particularly valuable in the study of fine-grained rocks that are difficult to characterize through petrographic studies. Geochemical data revealed that the felsic granitic plutonic provenance of moderate relief of arc massif exposed on tectonically calm continental margin which is probably the Shan- Thai continental block eastern and northeastern Myanmar . Average values of both Chemical Index of weathering (CIW) and Chemical Index of Alteration (CIA) ( 77.4 and 67.3 respectively ) suggest a moderately chemical weathering condition prevailed during transportation and deposition on passive shallow margin as progressive mature sediments.
https://geopersia.ut.ac.ir/article_63298_a9fe9d33a4fd8f4e64a6796b04bcb58d.pdf
2018-01-01
1
12
10.22059/geope.2017.230212.648314
Pyawbwe Formation
Early Miocene
Pyay basin
Central Myanmar Basin
Passive shallow marine margin
Mostafa
Hamad
mnhamad88@yahoo.com
1
Cairo university, Faculty of Science, Geology Department, Egypt
LEAD_AUTHOR
Reda
El-Gammal
redaelgammal2000@gmail.com
2
Consultant , Geology and Mining, GeoMine Mining Company, Cairo,Egypt.
AUTHOR
Soe
Lwin
juanmart_so@yahoo.com
3
Geology Department, Faculty of Science, Yangon university, East Yangon.
AUTHOR
Myo
Aung
aung.myo@yahoo.com
4
Geology Department, Faculty of Science, Yangon university, East Yangon.
AUTHOR
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ORIGINAL_ARTICLE
Morpho-tectonics and Geoelectrical method applied to active faults characterization in South of Mashhad Plain, Northeast of Iran
Mashhad city, the second most populous metropolis of Iran, with a population of more than three million, lies between two seismically active regions of Binalood and Kopet-Dagh. In recent years, the city has grown around the South Mashhad (SM) fault zone in the south. Given the vital role of the SM fault in influencing the seismic risk of the city, this study is aimed at the evaluation of the fault’s characteristics and activity. The overall trend of the fault and evidence of its activities are investigated by morphotectonic studies, and the situation of fault zone was explored by different geophysical methods including resistivity, magnetic and microtremor array. Morphology studies have shown that SM fault results in the deviation of the river channels, replacement, and deformation of alluvial fans. The geoelectric studies have shown three segments of the fault, F1, F2, and F3, with the notable normal displacement. Magnetometry and microtremor array studies across F1 confirmed the normal displacement of the fault. It is concluded that SM fault is an active right-lateral and normal fault system that had a significant role in the development of Mashhad Valley.
https://geopersia.ut.ac.ir/article_63998_c0e676e594c3c206403b051d2cc40ac7.pdf
2018-01-01
13
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10.22059/geope.2017.230489.648312
South Mashhad Fault
geoelectric
Morpho-tectonic study
Mashhad plain
Naser
Hafezi Moghaddas
nhafezi@um.ac.ir
1
Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran, Fellowship, School of Computing, Engineering & Math, Western Sydney University, Kingswood Campus, Sydney, Australia
LEAD_AUTHOR
Chin
Leo
c.leo@westernsydney.edu.au
2
School of Computing, Engineering & Math, Western Sydney University, Kingswood Campus, Sydney, Australia
AUTHOR
Behnam
Rahimi
b-rahimi@um.ac.ir
3
Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
AUTHOR
A
Azadi
4
Department of Geology, Faculty of Science, Payame noor university of Parand, Tehran, Iran
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Zamani, A., Nourbakhsh, A., Samiee Ardabili, J., 2010. Evaluation of Active Tectonics of Regions Using Morphotectonic, Structural, and Seismicity Studies: Mashhad Plain, NE Iran, EGU General Assembly 2010, Vienna, Austria.##
53
ORIGINAL_ARTICLE
Comparison Between Unsupervised and Supervise Fuzzy Clustering Method in Interactive Mode to Obtain the Best Result for Extract Subtle Patterns from Seismic Facies Maps
Pattern recognition on seismic data is a useful technique for generating seismic facies maps that capture changes in the geological depositional setting. Seismic facies analysis can be performed using the supervised and unsupervised pattern recognition methods. Each of these methods has its own advantages and disadvantages. In this paper, we compared and evaluated the capability of two unsupervised methods Fuzzy c-means (FCM) and Gustafson Kessel (GK) and one supervised method Adaptive Neuro-Fuzzy Inference Systems (ANFIS) at revealing the presence of a channel system. The process is performed in an interactive scheme in the SeisART software to obtain the best output. The seismic facies analysis was conducted on a 3D seismic data set acquired at North Sea block F3. Based on the results, the GK method outperformed the other two methods in delineating the channel pattern.
https://geopersia.ut.ac.ir/article_64226_57c7fe8ca51e8773087ddacc0292815e.pdf
2018-01-01
27
34
10.22059/geope.2017.240099.648346
Seismic facies analysis
seismic attributes
fuzzy c-means
Gustafson Kessel
Adaptive Neuro-Fuzzy Inference Systems (ANFIS)
Saeed
Hadiloo
hadiloo80@gmail.com
1
Research Institute of Applied Sciences, (ACECR), Shahid Beheshti University,Tehran,Iran
AUTHOR
Saeid
Mirzaei
s.mirzaei@acecr.ac.ir
2
Research Institute of Applied Sciences (ACECR), Shahid Beheshti University, Tehran, Iran
LEAD_AUTHOR
Hosein
Hashemi
hashemy@ut.ac.ir
3
Institute of Geophysics, University of Tehran,Iran
LEAD_AUTHOR
Bijan
Beiranvand
biranvandb@ripi.ir
4
Research Institute of Petroleum Industry, Tehran, Iran
AUTHOR
Abraham, A., 2005. Adaptation of fuzzy inference system using neural learning. Fuzzy systems engineering, 914-914.##
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47
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48
ORIGINAL_ARTICLE
Algae (Dasycladales) from the Upper Triassic Nayband Formation (northeast Iran)
Dasycladales are relatively abundant in the bedded limestones of the Bidestan and Howz-e Khan members of the Late Triassic Nayband Formation in central Iran. In a locality south of the town of Naybandan (northwest of Dig-e Rostam), several Rhaetian dasycladacean algae were found in thin sections. The following taxa are described: Diplopora phanerospora Pia, Naybandoporella rhaetica nov. gen. nov. sp., Naybandoporella cf. rhaetica. The species Probolocuspis sarmeikensis Senowbari-Daryan is replaced and attributed to the genus Naybandoporella. The microfacies characteristics of the limestones as well as the associated organisms are mentioned.Key words: Algae, Dasycladales, Naybandoporella, Upper Triassic, Nayband Formation, Iran
https://geopersia.ut.ac.ir/article_63787_8ac088a5f023408cfa6f02eea6a07d49.pdf
2018-01-01
35
42
10.22059/geope.2017.235449.648331
Algae
Dasycladales
Naybandoporella
Upper Triassic
Nayband Formation
Baba
Senowbari-Daryan
baba.senowbari-daryan@fau.de
1
Geozentrum Nordbayern, Department of Palaeoenvironment, University of Erlangen-Nürnberg, Loewenichstr. 28, 91054 Erlangen, Germany
LEAD_AUTHOR
Bodrogi, I., Conrad, M. A., Lobitzer, H., 1993. Lower Cretaceous Dasycladales from the Villány zone, Southwest Hungary. Biogeographical significance. Boll. Soc. Paleont. Ital., special 1: 59-68 (in: Barattolo, F., De Castro, P. & Parente, M. (eds.): Suties on Fossil Benthic Algae.##
1
Brönnimann, P., Zaninetti, L, Bozorgnia, F., Dashti, G. R., Moshtaghian, A., 1971. Lithostratigraphy and foraminifera of the Upper Triassic Nayband Formation, Iran. Rev. Micropaleont., 14 (5): 7-16.##
2
Cherchi, A., Schroeder R., 2013. Revision of the holotype of Lithocodium aggregatum Elliott 1956 (Lower Cretaceous, Iraq): New Interpretation as sponge-calcimicrobe consortium. Facies, 59: 49-57.##
3
Deloffre, P., 1988. Nouvelle Taxonomie des Algues Dasycladales.- Bull. Centr. Rech. Expl.-Prod. Elf-Aquitane, 12 (1): 165-217.##
4
Endo, R., 1952. Stratigraphical and Paleontological Studies of the Later Paleozoic Calcareous Algae in Japan, II. Trans. Proc. Paleont. Soc. Japan, new. ser., 5: 139-144.##
5
Fenninger, A., 1969. Ein Beitrag zur Flora and Fauna im Raum von Golpaygan (Iran). Verh. Geol. Bundesanstalt, 1: 22-32.##
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Flügel, E., 2004. Microfacies of carbonate rocks. 976 p., Springer.##
7
Flügel, E., 2010. Microfacies of carbonate rocks. Springer.##
8
Flügel, E., Mu, X. 1982. Upper Triassic Dasycladaceae from Easten Tibet. Facies, 6: 59-74.##
9
Fürsich, F. T., Hautmann, M., Senowbari-Daryan, B., Seyed-Emami, K., 2005. The Upper Triassic Nayband and Darkuh formations of east-central Iran: Stratigraphy, facies pattern and biota of extensional basins on an accreted terrane. Beringeria, 35: 53-133.##
10
Kützing, F. T., 1843. Phycologia, Generalis oder Anatomie, Physiologie und Systematik der Tange. FA Brockhaus, Leipzig: 311-313.##
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Nittel, P., 2006. Beiträge zur Stratigraphie und Mikropaläontologie der Mitteltrias der Innsbrucker Nordkette (Nördliche Kalkalpen, Austria). Geo. Alp., 3: 93-14.##
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Papenfuss, G. F., 1955. Classification of the algae: A century of progress in the natural sciences 1853-1953. Californian Acad. Sci. San Francisco, 20: 115-224.##
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Parente, M., Climaco, A., 1999. Dasycladacean green algae from the Upper Triassic of Mt. Rotonda (Verbicaro Unit, Calabria-Lucania border, Southern Italy). Facies, 41: 159-182.##
14
Pascher, A. 1931. Systematische Übersicht über die mit Flagellaten in Zusammenhang stehenden Algenreihen und Versuch einer Einreihung dieser Algenstämme in die Stämme des Pflanzenreiches. Botanisches Centralblatt, Beiheft, 48: 317-332.##
15
Pia, J., 1920. Die Siphoneae verticillatae vom Karbon bis zur Kreide. Abh. Zool.-bot. Ges. Wien, 11(2): 1-263.##
16
Pia, J., 1930. Upper Triassic fossils from the Burmo-Siamese frontier. A new Dasycladacea, Holosporella siamensis nov. gen., nov. sp., with a description of the allied genus Aciculella Pia. Records geol. Surv. India, 63(1): 177-181.##
17
Ott, E. 1967. Dasycladaceen (Kalkalgen) aus der nordalpinen Obertrias. Mitt. Bayer. Staatssamml. Paläont. hist. Geol., 7: 205-226.##
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Ott, E., 1972. Zur Kalkalgen-Stratigraphie der Alpinen Trias. Mitt. Ges. Geol. Bergbaustud., 21: 455-464.##
19
Rashidi, K., Senowbari-Daryan, B., 2011. Sponges from a section of the Upper Triassic Nayband Formation, northeast of Esfahan, central Iran. Ann. Naturhist. Mus. Wien, Ser. A, 113: 309-317.##
20
Schafhäutl, K. E., 1963. Süd-Bayerns Lethaea Geognostica. Geologisch betrachtet in ihren Petrefacten.- L. Voss, Leipzig, xvii + 487 p., 86 pls.##
21
Schlagintweit, F., 2011. Taxonomic Revision of Late Triassic „Lithocodium aggregatum Elliot“(Northern Calcareous Alps, Austria). Jb. Geol. B.-A. Wien, 151 (3+4): 375-396.##
22
Senowbari-Daryan, B., 1980. Fazielle und paläontologische Untersuchungen in oberräthischen Riffen (Feichtenstein‑ und Gruberriff bei Hintersee, Salzburg, Nördliche Kalkalpen). Facies, 3: 1‑237.##
23
Senowbari-Daryan, B., 2005a. Neue inozoide Schwämme aus den obertriassischen (Nor-Rhät) Riffen der Nayband-Formation (Zentraliran). Senckenbergiana lethaea, 85 (2): 261-299.##
24
Senowbari-Daryan, B., 2005b. Hypercalcified sphinctozoan sponges from Upper Trissic (Norian-Rhaetian) reefs of Nayband Formation (Central and Northeast Iran) - Jb. Geol. B.-A., Wien, 145 (2): 171-277.##
25
Senowbari-Daryan, B., 2014. Dasycladales algae from the Norian-Rhaetian reef carbonates of Argolis Peninsula, Greece. Acta Palaeont. Romoniae, 10(1-2): 39-46.##
26
Senowbari-Daryan, B., Hamedani, A., 2000. Obertriadische Dasycladaceen aus der Nayband-Formation vom Zentraliran. Rev. Paléobiol. Genève, 19 (1): 97-121.##
27
Senowbari-Daryan, B., Majidifard, M. R., 2003. A Triassic “Problematic” microfossil revealed: Probolocuspis espahkensis Bronnimann, Zaninetti, Moshtaghian & Huber 1974 is attributed to the dasycladacean algae. Facies, 48: 107-114.##
28
Senowbari-Daryan, B., Rashidi, K., Saberzadeh, B., 2011. Dasycladalean green algae and some problematic algae from the Upper Triassic of the Nayband Formation (northeast Iran). Geol. Carpathica, 62 (6): 501-517.##
29
Senowbari-Daryan, B., Torabi, H., Rashidi, K., 2008. New solenoporaceans from the Upper Triassic (Norian?-Rhaetian) reef limestones in central Iran. Geol. Croatica, 61(2-3): 135-157.##
30
ORIGINAL_ARTICLE
Prediction of pore facies using GMDH-type neural networks: a case study from the South Pars gas field, Persian Gulf basin
The current study proposes a two-step approach for pore facies characterization in the carbonate reservoirs with an example from the Kangan and Dalanformations in the South Pars gas field. In the first step, pore facies were determined based on Mercury Injection Capillary Pressure (MICP) data incorporation with the Hierarchical Clustering Analysis (HCA) method. In the next step, polynomial meta-models were established based on the evolved Group Method of Data Handling (GMDH) neural networks for the purpose of pore facies identification from well log responses. In this way, the input data table used for training GMDH-type neural network consists of CALI, GR , CGR , SGR, DT, NPHI, RHOB, PEF, PHIE and VDL logs. The MICP-HCA derived pore facies were considered as the desired outputs. Moreover, multi-objective genetic algorithms (GAs) are used to the evolutionary design of GMDH-type neural networks. Training error and prediction error of neural network have been considered as conflicting objectives for Pareto multi-objective optimization. The results of this study indicate the successful implementation of GMDH neural networks for classification of pore facies in the heterogeneous gas bearing carbonate rocks of South Pars gas field.
https://geopersia.ut.ac.ir/article_63986_32076e1982c6b9d6ce917d31b9ddf417.pdf
2018-01-01
43
60
10.22059/geope.2017.228906.648302
rock typing
MICP curves
Clustering
Classification
South Pars gas field
Ali
Kadkhodaie
kadkhodaie_ali@tabrizu.ac.ir
1
Department of Earth Science, Faculty of Natural Science, University of Tabriz,Tabriz, Iran
LEAD_AUTHOR
Ebrahim
Sefidari
ebispidari@gmail.com
2
Department of Geology, University College of Sciences, University of Tehran, Tehran, Iran
AUTHOR
Behzad
Ahmadi
kadkhodaie_ali@yahoo.com
3
Department of Mechanical engineering, Sharif University, Tehran, Iran
AUTHOR
Bahman
Ahmadi
ebrahimspidari@yahoo.com
4
Department of Mechanical engineering, University of Guilan, Rasht, Iran
AUTHOR
Mohammad Ali
Faraji
faraji_salar@yahoo.com
5
Department of Geology, University College of Sciences, University of Tehran, Tehran, Iran
AUTHOR
Aali, J., Rahimpour-Bonab, H. and Kamali, M. R., 2006. Geochemistry and origin of the world's largest gas field from Persian Gulf, Iran. Journal of Petroleum Science and Engineering, 50: 161-175.##
1
Ahr, W.M., 2008. Geology of Carbonate Reservoirs: the Identification, Description, and Characterization of Hydrocarbon Reservoirs in Carbonate Rocks. (Hoboken: Wiley), 296 pp.##
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Jamali, A., Nariman-zadeh, N., Darvizeh, A., Masoumi, A., Hamrang, S., 2009. Multi-objective evolutionary optimization of polynomial neural networks for modelling and prediction of explosive cutting process, Engineering Applications of Artificial Intelligence 22, (4-5): 676-687.##
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Kashfi, M. S., 1992. Geology of the Permian ‘supergiant’ gas reservoirs in the greater Persian Gulf area Journal of Petroleum Geology, 15: 465–80.##
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27
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28
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30
Rahimpour-Bonab, H., Asadi-Eskandar, A. andSonei, R., 2009. Effects of the Permian–Triassic boundary on reservoir characteristics of the South Pars gas field, Persian Gulf. Geological Journal, 44(3): 341-364.##
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45
ORIGINAL_ARTICLE
Gaseous Reservoir Horizons Determination via Vp/Vs and Q-Factor Data, Kangan-Dalan Formations, in One of SW Iranian hydrocarbon Fields
An important method in oil and gas exploration is vertical seismic profile (VSP) to estimate rock properties in drilling well. Quality factor is also the crucial point of seismic attenuate in VSP data. In the present study, this factor was used to evaluate the hydrocarbon potential of Kangan Formation in one of the Persian Gulf oil fields using VSP zero offset method. Quality factor was estimated using VSP spectral ratio method. Density and porosity logs are also used to determine lithology and reservoir fluid types. Analysing Vp/Vs ratio changes is a useful tool to detect hydrocarbon accumulation. These points marked by high amplitude energy in seismograms in correlation with petrophysical logs. According to Vp/Vs plots and geological logs of the field revealed that Vp/Vs ratio is increased at depths indicating hydrocarbon presence. Data are showing good correlation to petrophysical logs. Therefore, VSP method can be applied as a suitable alternative method to find hydrocarbon reserves in those boreholes without petrophysical logs.
https://geopersia.ut.ac.ir/article_63999_f247c07faa5c8eabe374630904591f1d.pdf
2018-01-01
61
76
10.22059/geope.2017.239616.648340
Vertical Seismic Profile (VSP)
ِDalan-Kangan formations
quality factor
Hydrocarbon reservoir
Bahman
Soleimani
soleimani_b@scu.ac.ir
1
Department of Geology, Faculty of Earth Sciences,Shahid Chamran University of Ahvaz, Iran
LEAD_AUTHOR
Kazem
Rangzan
kazemrangzan@scu.ac.ir
2
Department of Remote Sensing and GIS, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz
AUTHOR
Ehsan
Larki
ehsan58larki@gmail.com
3
Geophysics-Seismic Exploration, Well logging NIDC, Ahvaz
AUTHOR
Kurosh
Shirali
kourosh.shirali@gmail.com
4
Department of Geology, Faculty of Earth Sciences,Shahid Chamran University of Ahvaz, Iran
AUTHOR
Masoud
Soleimani
msd.soleimani@yahoo.com
5
Department of Geology, Faculty of Earth Sciences,Shahid Chamran University of Ahvaz, Iran
AUTHOR
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ORIGINAL_ARTICLE
Rock typing and reservoir zonation based on the NMR logging and geological attributes in the mixed carbonate-siliciclastic Asmari Reservoir
Rock typing is known as the best way in heterogeneous reservoirs characterization. The rock typing methods confine to various aspects of the rocks such as multi-scale and multi-modal pore types and size, rock texture, diagenetic modifications and integration of static/dynamic data. Integration of static and dynamic behavior of rocks and their sedimentary features are practiced in this study. Porosity, permeability and pore size distributions are investigated as the static and capillary pressure, water saturation and irreducible water saturation as dynamic behavior of the rocks. Results from core data analysis in some intervals and continuously NMR data through the whole well are also involved. Initially, based on Flow Zone Index method, while considering geological attributes, 7 rock types are determined. The petrophysical properties of the rock types including Pc, SW and SWir are combined into the rock types. Afterward, pore types, facies characteristics, texture and diagenetic overprints are involved in the rock type’s classification to capture spatial trends and relationships. Eventually, the rock types are defined in the cored intervals by these parameters and predicted in non-cored intervals by NMR. The rock types are established to provide a clue on the high and low permeable zones and accurate reservoir zonation
https://geopersia.ut.ac.ir/article_64157_137b5148138f3a546ea9453ce9718e54.pdf
2018-01-01
77
98
10.22059/geope.2017.237140.648333
Asmari Reservoir
capillary pressure
rock typing
reservoir zonation
mixed carbonate-siliciclastic reservoirs
Sajjad
Gharachelou
sgharechelo@ut.ac.ir
1
School of geology, College of science, university of Tehran, Tehran, Iran.
AUTHOR
Abdolhossein
Amini
ahamini@ut.ac.ir
2
Department of Geology, Faculty of Science, University of Tehran, Tehran, Iran
LEAD_AUTHOR
Ali
Kadkhodaei
kadkhodaie_ali@yahoo.com
3
Earth Science Department, University of Tabriz, Tabriz, 14355-9785, Iran
AUTHOR
Ziba
Hosseini
ziba.hosseini85@gmail.com
4
Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 15445-9123 Iran
AUTHOR
Javad
Honarmand
honarmandj@gmail.com
5
Research Institute of Petroleum Industry, Petroleum Geology Department, Tehran, 14167-6654, Iran
AUTHOR
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ORIGINAL_ARTICLE
Application of TDA technique to estimate the hydrocarbon saturation using MRIL Data: A Case study for a Southern Iranian Oilfield
Petrophysical evaluation of petroleum reservoirs is one of the most challenging tasks for hydrocarbon reserve determination. One critical petrophysical parameter is the water saturation which is normally calculated from Archie’s equation. Carbonate reservoirs, however, due to their complex mineralogy are not good candidates for Archie’s equation because Archie’s parameters are strongly dependent on pore pattern distribution, type and distribution of clay content, wettability and mineralogical properties. In the present study, Magnetic Resonance Image Logging (MRIL) was used to determine water and hydrocarbon volumes using Time Domain Analysis (TDA) technique. The results of TDA technique indicated that the water and oil peaks are well separated in the light oil zones and the calculated volumes of hydrocarbon and water by using TDA were in agreement with water and oil saturation calculated from conventional logging measurements. Moreover, values of reservoir oil viscosities were estimated to be less than 10 cps by intrinsic T1. This study shows that MRIL-based interpretation models are easy to apply because they require fewer unknowns as inputs and because MRIL response is not influenced by the resistivity model’s parameters, water salinity, etc.
https://geopersia.ut.ac.ir/article_64439_f9d65c478f456a2609c0311d8f445667.pdf
2018-01-01
99
110
10.22059/geope.2018.230931.648315
MRIL
Time Domain Analysis (TDA)
hydrocarbon saturation
water saturation
viscosity
Mahdi
Rastegarnia
mahdi65.rastegarnia@gmail.com
1
Department of Petrophysics, Homai Well Services Company, Tehran, Iran
AUTHOR
Ali
Sanati
ali.sanati@yahoo.com
2
Senior lecturer at the Faculty of Petrochemical and Petroleum Engineering, Hakim Sabzevari University, Sabzevar, Iran
LEAD_AUTHOR
Dariush
Javani
javani.dariush@gmail.com
3
Mining Engineering Department, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin, Iran
AUTHOR
Amirov, E., 2016. Application of MRIL-WD (Magnetic Resonance Imaging Logging While Drilling) for irreducible water saturation, total reservoir, free-fluid, bound-fluid porosity measurements and its value for the petrophysical analysis of RT/RM data from the Shah Deniz wells which were drilled in the Khazarian-Caspian Sea of the Azerbaijan Republic. Geophysical Research Abstracts.##
1
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10
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12
ORIGINAL_ARTICLE
Adakite magmatism within the Sabzevar ophiolite zone, NE Iran: U-Pb geochronology and Sr-Nd isotopic evidences
Numerous post-ophiolite intrusions exposed into the late Cretaceous–Paleocene Sabzevar ophiolite belt, northeast Iran. The intrusions consist of calc-alkaline intermediate to felsic rocks with metaluminous to peraluminous in nature and adakitic affinities. Based on U-Th-Pb dating on separated zircons by SHRIMP Ⅱ, the emplacement age of these rocks into the ophiolite zone is constrained to ~45 Ma. All intrusions show similar MORB –like initial Nd and Sr values of 0.512911 to 0512846 and 0.704758 to 0.703790, respectively, with positive εNd (45 Ma) values of +5.26 to +6.45 implying their cogenetic nature. These isotopic signatures combined with geochemical evidences are corresponding to parental adakitic magmas derived from wet partial melting of a garnet-amphibolite source from Sabzevar subducted oceanic lithosphere. After emplacement in the deep magma storage region (equal to 700-900 MPa), this magma evolved to intensify adakitic signatures via amphibole–dominated magma fractionation.
https://geopersia.ut.ac.ir/article_64220_1f8c7e13837c78ddf61696280c92db2c.pdf
2018-01-01
111
131
10.22059/geope.2017.242944.648352
Geochronology
Sr–Nd Isotopes
Adakite
Sabzevar
Iran
Khadije
Jamshidi
khj.jamshidi@yahoo.com
1
Department of Petrology, School of Geosciences, Shahrood University of Technology, Shahrood,Iran
LEAD_AUTHOR
Habibolah
ghasemi
h-ghasemi@shahroodut.ac.ir
2
Department of Petrology, School of Geosciences, Shahrood University of Technology, Shahrood,Iran
AUTHOR
Laicheng
Miao
miaolc@mail.iggcas.ac.cn
3
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, P.O. Box 9825 China
AUTHOR
Mahmoud
Sadeghian
m.sadeghian1392@yahoo.com
4
Department of Petrology, School of Geosciences, Shahrood University of Technology, Shahrood,Iran
AUTHOR
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ORIGINAL_ARTICLE
Correlation between rock types and Copper mineralization using fractal modeling in Kushk-e-Bahram deposit, Central Iran
In this paper, correlation between rock types and Cu mineralization obtained by Concentration-Number (C-N) fractal model calculated in Kushk-e-Bahram Cu deposit, Central Iran. This deposit is located in the Urumieh-Dokhtar magmatic arc (UDMA). The main subject in this study was determination of relation between the Cu grade populations and rock types based on subsurface data using logratio matrix. The C–N log–log plot reveals six geochemical populations which defined by Cu
https://geopersia.ut.ac.ir/article_64342_e69426873fd30069ef42d6034804cf39.pdf
2018-01-01
131
141
10.22059/geope.2017.237332.648334
Kushk-e-Bahram Cu deposit
Concentration-Number (C-N) fractal model, Logratio matrix
Peyman
Afzal
peymanafzal@yahoo.com
1
Department of Mining Engineering, South Tehran branch, Islamic Azad University, Tehran, Iran
LEAD_AUTHOR
Marjan
Jebeli
jebeli_marjan@yahoo.com
2
Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran
AUTHOR
Mohsen
Pourkermani
mohsen.pourkermani@gmail.com
3
Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran
AUTHOR
Alireza
Jafari Rad
alirad@yahoo.com
4
Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
AUTHOR
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