2021-07-16T10:05:16Z https://geopersia.ut.ac.ir/?_action=export&rf=summon&issue=7306

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Ali Shekarifard To evaluate the relationship between total organic carbon (TOC) and Rock-Eval S2 (petroleum potential) of petroleum source rocks, atotal of 180 outcrop samples from the black organic matter–rich facies of Mesozoic strata from a locality of southwest of Iran wereinvestigated using Rock-Eval VI pyrolysis and Leco Carbon Analyzer. The linear regression is applied to determine the correlationbetween Leco TOC and Rock-Eval S1 and S2. The accuracy of the proposed model by this method has approximately 95% conformityaccording to the Rock-Eval S2 and Leco TOC data (TOC = 0.492 + 0.174 S2). Then, by using the P value method, it was determinedthat TOC is a function of S2 and S1 only causes the fluctuations. By means of sensitivity analysis of TOC with respect to S1 and S2, itwas shown that TOC has a linear relationship with S2 and does not have any noticeable correspondence to S1. The result of this studycan be used to evaluate petroleum potential (S2) of organic matter–rich facies by using TOC obtained by Leco Carbon Analyzer. Forthe studied samples from the organic matter-rich facies, organic carbon richness is a quality and quantity index of petroleum potential. Leco TOC Organic Matter–Rich Facies P value Petroleum Potential index Rock-Eval VI pyrolysis 2015 03 01 1 6 https://geopersia.ut.ac.ir/article_54069_90adf05d92f8dc4209d8474c509bcbf5.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Ali Kadkhodaie-Ilkhchi Optimization of reservoir parameters is an important issue in petroleum exploration and production. The Ant Colony Optimization(ACO) is a recent approach to solve discrete and continuous optimization problems. In this paper, the Ant Colony Optimization is usedas an intelligent tool to estimate reservoir rock properties. The methodology is illustrated by using a case study on shear wave velocityestimation from petrophysical data by the linear and nonlinear ACO models. The results of this research show that the ACO is a fast,robust and cost-effective method for rock properties estimation. It is proposed that ant colony optimization aids in future reservoircharacterization studies. Ant colony Optimization Petrophysical Data Rock Properties Shear wave velocity 2015 03 01 7 17 https://geopersia.ut.ac.ir/article_54070_e7bbe124bb27f8e497a5be7b2c270db2.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Hossein Sabbaghiyan Ebrahim Ghasemi - Nejad Mohammadreza Aria-Nasab Rhaetian strata from the Nayband Formation of the Tabas block, East- Central Iran, were studied palynologically. The materialexamined contained moderately diverse and well-preserved dinoflagellate cyst assemblages which lead to the identification ofRhaetogonyaulax rhaetica Zone. The assigned age of this dinozone (Rhaetian) is justified by plant fossils such as Equisetitesarenaceus, Scytophyllum persicum, Pterophyllum bavieri, Pterophyllum aequale and Nilssoniopteris musafolia recorded from thesestrata. The dinoflagellate cysts show close similarities with assemblages reported from Australia, Northwest Europe, Arctic Canadaand Northern Iran. Furthermore, the associated marine palynomorphs (dinoflagellate cysts), accompanied by spores grain indicate anearshore depositional environment for the Late Triassic (Rhaetian) deposits in Tabas Block of Iran. Late Triassic Dinoflagellate cysts Palaeobiogeography Tabas block Iran 2015 03 01 19 26 https://geopersia.ut.ac.ir/article_54071_a3cbcf67aec2afa30eab12617c152ee5.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Fatemeh Vaez-Javadi Mohsen Allameh Jurassic deposits are well exposed in the Bazehowz area, South west of Mashhad city, East Alborz, Iran. It contains plant macrofossilsbelonging to eighteen species of eleven genera of various orders such as Equisetales, Filicales, Bennettitales, Cycadales,Corystospermales, Caytoniales, Ginkgoales and Pinales. Two biozones were recognized in the type section of Bazehowz Formation.Biozone I is an assemblage biozone with its lower and upper boundaries identified by first observed occurrence (FOO) and the lastobserved occurrence (LOO) of Nilssonia rigida, Nilsssonia sp. cf. N. bozorga and Nilssonia feriziensis. Since there are species fromLiassic such as Nilssonia rigida and uppermost Liassic such as Nilssonia feriziensis and Nilssonia sp. cf. N. bozorga, a Toarcian ageis suggested for this biozone. Biozone II is an interval zone with its lower and upper boundaries identified by FOO of Klukia exilis andPtilophyllum vasekgahenses and Coniopteris hymenophylloides and Ctenozamites cycadea, respectively. According to occurrence ofKlukia exilis, a lowermost Middle Jurassic age is suggested for the lower boundary and based on the occurrence of Coniopterishymenophylloides Aalenian age is considered for upper boundary of Biozone II. On the basis of relative abundance of Filicales(%16.6), Bennettitales (%27.7) and Cycadales it is considered a humid sub-tropical climate for this period of time. Alborz Bazehowz Formation Biostratigraphy Jurassic Flora Iran 2015 03 01 27 44 https://geopersia.ut.ac.ir/article_54072_b66da46ac2ce41729b3da600eba848b9.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Mohammad Reza Aminizadeh Bazanjani Iman Aghamolaie Golamreza Lashkaripour Mohammad Ghafoori This research was performed to determine the efficiency effect of sedimentary environment of Kerman City area on soil structure bycomparing natural and reconstituted consolidation curves. In this regard, four different criteria such as sensitivity strength, stresssensitivity, Schmertman criteria and the result of the uniaxial compression test were used. The base of these criteria is to compare theresults of natural and undisturbed soil consolidation tests. The position of undrained shear strength of Kerman City soils in Iv-Su spacewas located on the left side of the intrinsic strength line and this confirms that the stress sensitivity of soils is less than the unit.Therefore, the soils in the city subzone are mostly over consolidated, and cementation and chemical bonds have not developed. Theswelling sensitivity of fine grained soils based on Schmertman criteria are often less than 2 or slightly larger than 2.5 indicating that thesoils of Kerman City subzones have underdeveloped swelling sensitivity due to poor cementation. Intrinsic Compression line sedimentary environment Strength Sensitivity Stress Sensitivity 2015 03 01 45 54 https://geopersia.ut.ac.ir/article_54074_5e07b965be5bdb762688cd7f682cab54.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Younes Karami Aznadaryani Akbar Cheshomi Amir Khabbazi Basmenj Mohammad Ghafoori Clogging occurs during mechanical tunneling with a Tunnel Boring Machine (TBM) because of adhesion of clayey soils to the cutterhead and conveyor system. The present study examined the effects of water and sand contents on clogging in Montmorillonite clayeysoil. Testing was carried out using an adhesion test device on 28 samples with different water and sand contents to determine adhesionstress and degree of clogging. The results indicate that the consistency index (Ic) of the samples decreases as the sand and watercontent increases. The results for variation of adhesion stress versus water content at different sand contents formed similar bellshapedcurves. In all graphs, an increase in sand content decreased adhesion stress. Adhesion stress increased until the water contentincreased to 138%, at which point it began to decrease. The results show that adhesion of the soil to the surface of the metal piston didnot occur in samples having a sand content of >40% and in samples with >133% water content having a sand content of <40%, Ic>0.5adhesion occurred. adhesion Clayey Soil Clogging TBM tunnel boring machine 2015 03 01 55 62 https://geopersia.ut.ac.ir/article_54075_7deddbf1e0eea23a639c9fe4789eeee9.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Sakineh Parhizkar Khalil Ajdari Gholam Abbas Kazemi Samad Emamgholizadeh It is over two decades that groundwater flow models are routinely implemented for better management of groundwater resources.Modeling groundwater flow with the help of the ground water modeling system (GMS) in the Damghan plain aquifer in northern Iran,which experiences declining levels and numerous environmental hazards, has demonstrated that, (a) in the worst case scenario theaquifer will face 320 cm of drawdown by year 2019 and (b) land subsidence is observed mainly in areas that are subjected to anaccelerated water level drawdown rate, such as, the southern part of the aquifer. Four different rainfall scenarios that have beenmodeled demonstrate that some areas of the aquifer are slightly impacted by climatic change in contrast to some other areas that arebeing influenced substantially. Together with GMS, Genetic Expression Programming (GEP) and Multiple Linear Regression (MLR)models were used to forecast land subsidence by applying developing functional relations to the long-term groundwater drawdowndata. This segment of the study shows that a 35.4 cm and 39.45 cm settlement will occur if the groundwater level drops by 295 cm and343 cm, respectively. This research shows that the water level in the Damghan aquifer continues to decline and the land subsidencewill intensify. It is, therefore, needed to reduce groundwater pumping in high-risk areas. Ground Water Modeling Damghan Land Subsidence Overexploitation Water Level Drawdown 2015 03 01 63 80 https://geopersia.ut.ac.ir/article_54076_f3dcc779dfe8f73db14c9acbf252b62e.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 Mohammad Mohajjel Abdolaziz azodi Dariush Esmaeili Mohammadvali Valizadeh Shahryar Mahmoudi The Shah-Kuh granitoid has intruded in the Triassic–Jurassic, pelitic and psammitic low-grade metamorphic rocks of the NE LutBlock, in Central Iran. Cordierite porphyroblasts are common in the southern pelitic sediments, but are rare in the northern psammiticrocks, in the contact aureole. Deformation fabrics in the contact aureole are well-preserved within the cordierite porphyroblasts. Therelation of the cordierite porphyroblasts and deformation fabrics indicate that the time of growth has started and is synchronous withthe first deformation phase and ends after the second deformation stage. The porphyroblasts are also generated in syn-intrusion ductileshear zones existing in the contact aureole and continue inside the Shah-Kuh granitoid. Shear zones in the contact aureole containdeformed cordierite porphyroblasts, with microstructures indicating clear shear sense. Structural analysis of various metamorphic rocksin the contact aureole of the Shah-kuh granitoid indicates a first stage, which is tight to the isoclinal folds, with well-developed axialplanefoliation, and a second stage of crenulation cleavage. Sequential growth of cordierite porphyroblasts preserved fabric fromvarious stages of a progressive deformation in the granite contact aureole. It is concluded that the Shah-Kuh granitoid has intrusionssynchronous with progressive deformation, cordierite porphyroblasts growth, and shear zone development in the contact aureole of thegranitoid. Contact Aureole Cordierite Porphyroblast Deformation Iran Shah-Kuh 2015 03 01 81 91 https://geopersia.ut.ac.ir/article_54118_f5cccf167648fe72b3000287b5ad9934.pdf

2015-03-01 10.22059

Geopersia 2228-7817 2228-7817 2015 5 1 2015 03 01 1 4 https://geopersia.ut.ac.ir/article_54119_46b610ff0ba8be513a8893dc2e38ca1f.pdf