Iranian Journal of  Petroleum Geology: 25 (25)

Open Access Article

1 - Hydrodynamic and Hydrochemical Study in Oil Reservoirs: Asmari reservoir, Rag-E-Safid Oil Field
بهمن سلیمانی abdolah Momeni Faizhabad Mousa Zohrabzadeh

The evaluation of hydrodynamic characteristics can be a useful tool to understand the field behavior and production efficiency. The present study is an attempt to clarify hydrodynamic flow in the Asmari reservoir of the Rage Safid oil field. Water oil contact (WOC) dept More

The evaluation of hydrodynamic characteristics can be a useful tool to understand the field behavior and production efficiency. The present study is an attempt to clarify hydrodynamic flow in the Asmari reservoir of the Rage Safid oil field. Water oil contact (WOC) depth is 200m lesser in northern flank than southern part. The results indicated that the aquifer potentiometric surface is tilted. The Piper and Composition diagrams are showing the mixing process of two water types including Cl-Na type with higher TDI and calcic-magnesic bicarbonate type with lower TDI in the reservoir water. The first one is sourced from salt horizons of Gachsaran Formation and the second one is from limestone-dolomitic parts of the Asmari Formation. This result is also verified by TDI to depth plot. Hydrodynamic maps and fluids trends are showing a continuous flow from NE to W-SW of the field. This flow is relatively strong in western and south western part. Generally, production index and pressure data indicate a suitable condition in southern –southwestern part of the field. By considering fluid flux from NE to W-SW it is strictly proposed to focus drilling program in the western part and the water injection program in the north eastern part of the field. Manuscript profile

Open Access Article

2 - palaeoechology and taphonomy of Albian-Cenomanian Echinoids of Kazhdumi Formation in Firouzabad section, Zagros Basin
Babak Sedghi Ali Bahrami Yazdi Yazdi

Kazhdumi Formation deposits in Firouzabad section were investigated regarding the postmortem and burial events of echinoderms, from about 150 echinoderm fossils which include 10 genera and 13 species of Coenholectypus neocomiensis, Phymosoma binexilis, Dorocidaris taouz More

Kazhdumi Formation deposits in Firouzabad section were investigated regarding the postmortem and burial events of echinoderms, from about 150 echinoderm fossils which include 10 genera and 13 species of Coenholectypus neocomiensis, Phymosoma binexilis, Dorocidaris taouzensis, Cottaldia aff. Benettiae, Leptosalenia sergipensis, Phymosoma baylei, Micropedina olisiponensis, Tetragramma deshayesi, Macraster douvillei, Mecaster batnensis, Macraster obtritus, Pliotoxaster comanchei, Macraster sp., Hemiaster sp. most part of them suffer from disarticulation and fragmentation, radial cracks and shell deformation (test outline distortion and radial cracking) and volume change and biological erosion (bioerosion) and perforation by living worms (microboring). Of course, after volume changes, fractures or taphonomic compression, the existing solutions (hydrocarbon and solutions rich in iron, manganese and sometimes silica) hydroxides have been replaced in the cracks. The test of these echinoderms has been used by symbiotic epifauna such as Osterids and Gryphaes as food and attachment points and shelter after their death and burial. It seems that the volume change, crushing, solution injection and fauna bending are influenced by the tectonic pressure of the salt domes of the region and the soft lithology (high plasticity) of the Kazhdami formation between the Darian and Sarvak formations. Manuscript profile

Open Access Article

3 - Biostratigraphy and palaeoecology of Qom formation in the Ghamsr section (SW of the Kashan)
tayyeb binazadeh Amrollah Safari Hosyen Vaziri moghadam

In order to study the biostratigraphy and palaeoecology, the Qom Formation has been studied in the Ghamsar section of Kashan. The studied section, with a thickness of 314 m, consists of medium to thick-bedded to massive limestones and shale. The Qom Formation overlies t More

In order to study the biostratigraphy and palaeoecology, the Qom Formation has been studied in the Ghamsar section of Kashan. The studied section, with a thickness of 314 m, consists of medium to thick-bedded to massive limestones and shale. The Qom Formation overlies the Eocene volcanic rocks in the Ghamsar section and is covered by the Recent alluvial sediments. A total of 21 genera and 9 species of benthic foraminifera were identified in this section and the results indicated the age of Rupelian-Chattian. According to the above palaeoecological conditions, in the lower parts of this section (Rupelian), light conditions are euphotic and nutrient conditions are first eutrophic and then Meso-oligotrophic with mainly normal sea salinity. During Chattian, the trophic state was mainly meso-oligotrophic with normal salinity, and salinity varied between 40 and 50 PSU. Light conditions also were between aphotic and mainly meso-oligophotic. Large benthic foraminifera with hyaline walls, such as Amphistegina, Lepidocyclinide and Nummulitide, in shallow environments with high energy, have thicker shells and smaller shell size, and in deep environments, due to reduced light intensity and low water circulation, they have thinner and more elongated shells. The results of the morphometry of 186 samples of Amphistegina show that the seawater depth in Ghamsar section (Rupelian-Chattian) fluctuated from less than 11 meters to less than 44 meters. Manuscript profile

Open Access Article

4 - Strain and shortening analyses in the Asmari horizon, Kupal oil field, Khuzestan province
Babak Samani Mina Parvin Abbas Charchi Mohammad Hossein Talebifard

Kupal Oil Field is one of the important oil fields in the Zagros Basin, located in the eastern part of the Dezful embayment, adjacent to Aghajari Oil Field and Marun Oil Field. Some characteristics of the fold elements, such as the fold interval angle and axial surface, More

Kupal Oil Field is one of the important oil fields in the Zagros Basin, located in the eastern part of the Dezful embayment, adjacent to Aghajari Oil Field and Marun Oil Field. Some characteristics of the fold elements, such as the fold interval angle and axial surface, were determined in the Asmari folded horizon using the interpreted seismic profiles. Based on the deviation of the axial surface from the vertical surface and determination of shear angle and shear strain, minimum and maximum quadratic stretch and strain ratio (R) values were calculated in different parts of the anticline. With application of graphical functions the amounts of fold aspect ratio were determined along the anticline. Base on the results, the amounts of shear strain varies from 0.01 to 0.09 in deferent parts of anticline. Also results show the amounts of strain ratio in range of 1.25 to 1.38 and shortening about 5% to 17% in different parts of the kupal anticline oil field. Manuscript profile

Open Access Article

5 - Identification of gas in carbonate rock using wavelet transform
Hassan Omrani Hashem omrani

Gas can be diagnosed in clean sand rock by petrophysical log. It is not easy to determine the gas in carbonate rock by petrophysical log. The R.F.T. tool is used to determine the gas in carbonate rock. The fluid density in the rock is determined by calculating the press More

Gas can be diagnosed in clean sand rock by petrophysical log. It is not easy to determine the gas in carbonate rock by petrophysical log. The R.F.T. tool is used to determine the gas in carbonate rock. The fluid density in the rock is determined by calculating the pressure difference related to depth. The R.F.T. tool has some disadvantages, such as being expensive, taking much time to run, and rock having a neutron porosity of about 15%, and sometimes the R.F.T. tool is stuck in well. This study applies the wavelet transformation, a recent advance in signal analysis technique, to detect reservoir rock fluid. The porosity and water saturation are denoised using the "demy" mother wavelet. At last, the pore hydrocarbon saturation, porosity denoise by the "demy" wavelet, pore volume plot and R.F.T. tool are plotted together in one figure to identify the kind of fluid in sand and carbonate rocks. Manuscript profile

Open Access Article

6 - Evaluation of depositional environment conditions of middle Pliocene-Pleistocene clastic deposits (Bakhtiyari Formation) based on the characteristics of lithofacies the southeastern folded Zagros, north of Bandar Abbas city
Peyman Rezaei Seyedeh Akram Jooybari Shahrban Mohammadzadeh Shamili

The Bakhtiari Formation represents the Middle Pliocene-Pleistocene time period in the folded Zagros structural sedimentary zone. Debris deposits of this formation have wide outcrops in the northern area of Bandar Abbas city. In order to study the Bakhtiari formation fro More

The Bakhtiari Formation represents the Middle Pliocene-Pleistocene time period in the folded Zagros structural sedimentary zone. Debris deposits of this formation have wide outcrops in the northern area of Bandar Abbas city. In order to study the Bakhtiari formation from the point of view of sedimentary geology, three sections of this formation were selected in the northwest of Bandar Abbas city (Genow Power Plant, South of town Down Tazeyan, South of town Morvarid). From these sections, 50 samples were taken for microscopic examination and 6 samples were taken to identify heavy minerals. In all three sections, the Bakhtiari Formation includes an interval of conglomerate, sandstone and some mudstones. In the studied area, this formation is placed on the Aghajari formation with an erosional discontinuity boundary. The upper border of the Bakhtiari Formation with Quaternary deposits is also of erosional discontinuity. Field and laboratory investigations led to the identification of coarse-grained petrofacies (mud-supported conglomerate and grain-supported), medium-grained (calclitite sandstone), fine-grained (mudstone) and five structural elements (GB, CH, SB, GH, FF) has been. The results of this research show that the deposits of the Bakhtiari Formation in the north west of Bandar Abbas has been deposit in a braided river far from origin at the end of an alluvial fan. The set of heavy minerals identified in this sequence have two origins, Hormuz Salt Series and Sanandaj-Sirjan Zone, which have been affected by several sedimentary cycles. The set of petrofacies features of the Bakhtiari Formation is a confirmation of the tectonic dynamics of the end of the Cenozoic era in the middle Pliocene-Pleistocene time frame, especially the Bakhtyari tectonic event, which has led to the intensification of continental conditions in the studied area. Manuscript profile

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