Petroleum geology
Seyed Mahmoud Fatemi Aghda; Mashaallah Taslimi; Ahmad Fahimifar
Abstract
The main aim of this study is to examine the feasibility of estimation of flow zone indicator in carbonate rocks by integration of hydraulic flow unit concept a nuclear magnetic resonance technology. The two main permeability models Timur-Cotes and mean T2 models, because of worldwide usage of these ...
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The main aim of this study is to examine the feasibility of estimation of flow zone indicator in carbonate rocks by integration of hydraulic flow unit concept a nuclear magnetic resonance technology. The two main permeability models Timur-Cotes and mean T2 models, because of worldwide usage of these models, were used for evaluating the ability of nuclear magnetic resonance to estimate the flow zone indicator. One of the most important points in this study is the use of the experimental results of the nuclear magnetic resonance in laboratory on core that is never done in Iran. In this study, 24 carbonate samples were selected, and porosity, permeability and nuclear magnetic resonance experiments were performed. Then, using the results of the porosity and permeability tests, the flow zone indicator was determined and was considered as an index for evaluating the accuracy of the nuclear magnetic resonance method. Using the parameters obtained from the nuclear magnetic resonance test and nuclear magnetic resonance permeability models, flow zone indicator was estimated and compared with the core flow zone indicator. According to the results, it seems that the nuclear magnetic resonance permeability models, with the routine coefficients, do not have the proper ability to estimate the flow zone indicator, and it is necessary to correct the coefficients according to the lithology of rocks.
Exploration and Mining
Ali Aalianvari; Saeed Soltani-Mohammadi; Maryam Miri
Abstract
The main objective of this paper is to estimate water seepage from the Azad dam foundation, based on the combined geotechnical investigations and multivariate geostatistical methods. Geological filed investigations and records at the 38 exploratory boreholes have been considered as the main source for ...
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The main objective of this paper is to estimate water seepage from the Azad dam foundation, based on the combined geotechnical investigations and multivariate geostatistical methods. Geological filed investigations and records at the 38 exploratory boreholes have been considered as the main source for seepage calculations. Due to expansion of reservoir and a few boreholes and limitation of geological investigations, distribution of permeability and permeability changes in the reservoir area is not an indicator for reservoir. In this research using geostatistical method (Kriging), Lugeon values have been estimated for abutments and foundation of the reservoir. Afterward, seepage was estimated for reservoir by using numerical method (FEM).results show that around 450 lit/min water was seepage from the dam. That is very close to the observed seepage from dam foundation. Based on the results, the total seepage estimated is around 450 lit/min that is relatively closed to the observed and measurements flow (350lit/min).
F. Hormozzade; M. Baniassadi; F. Sahabi; H. Izadi; H. Memarian
Abstract
The determination of Petrophysical rock properties has always been an important part of geological modeling and also is used in reservoir engineering studies. Permeability (k) is one of the most important properties of porous media which is the measure of a porous material to allow fluids to pass through ...
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The determination of Petrophysical rock properties has always been an important part of geological modeling and also is used in reservoir engineering studies. Permeability (k) is one of the most important properties of porous media which is the measure of a porous material to allow fluids to pass through it. Permeability can be determined from both experimental tests and numerical simulations. Numerical simulations should be performed on geometries determined from advanced imaging techniques. Digital rock physics (DRP) is an approach for studying rocks nondestructively. In this paper, 10 carbonate rock plugs from the oil fields in South-West of Iran were imaged by medical CT scan and the outputs were used for image processing and permeability determination. We evaluated the use of Navier-Stokes equations to perform fluid flow simulation through the pore spaces geometry. The permeability of the samples were calculated and compared with laboratory-derived values. The results indicated a trend between the permeability values reported by the laboratory and medical CT images with R2=90%.
T. Naderi; M. Pourkermani; A. Shafiei Bafti; M. R. Aminizadeh; S. Bouzari
Abstract
In this study, the permeability of structures associated with Kuhbanan fault zone has been investigated. The Kuhbanan fault zone is one of the most seismically active structural trends in Kerman province. The behaviour of fault zones against groundwater flow (conduit, barrier, or a combination of both) ...
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In this study, the permeability of structures associated with Kuhbanan fault zone has been investigated. The Kuhbanan fault zone is one of the most seismically active structural trends in Kerman province. The behaviour of fault zones against groundwater flow (conduit, barrier, or a combination of both) is relatively controlled by fault core, damage zone, and permeability of fractures and rock units in the fault zone. In this research, qualitative and quantitative data, together with field observations and numerical models have been used. In order to measure the structures in the Kuhbanan fault zone, 23 outcrops were selected for model parameters. Results show that the fault zone acted as barrier in 12 outcrops, conduit in 4 outcrops and a combined barrier-conduit in 6 outcrops. In total, the 61-m-wide southern part of the Kuhbanan fault zone is composed of a fault core of 38 m and a damage zone of 23 m wide, respectively. Therefore, this segment of the Kuhbanan faul zone acts as a combination of conduit and strong barrier for fluid flow. The fault core is well developed but the damage zone is weakly developed , and therefore deformation has been largely localized within the fault core and distributed in the damage zone. To analyze the architecture of the fault zone three Fa, Fs, Fm indices were used. For the southern segment of the Kuhbanan fault zone, the Fa, Fs and Fm were measured as 0.47, 0.73 and 0.51, respectively. The relatively low Fa and high Fs indicate that the Kuhbanan fault zone in this area is not associated with uniform architecture. Also the numerous fault springs in the area are affected by this fault zone.
Mehran Arian; R. Mohammadian
Abstract
Marun oil field is situated on the eastern part of Dezful Embayment zone (Zagros).Aghajari Formation is cropping out on the surface. Asmari formation, Bangestan and Khami Groups are the Main reservoirs in this field. Asmari formation with six reservoirs layers is the most important reservoir. Dolomitic ...
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Marun oil field is situated on the eastern part of Dezful Embayment zone (Zagros).Aghajari Formation is cropping out on the surface. Asmari formation, Bangestan and Khami Groups are the Main reservoirs in this field. Asmari formation with six reservoirs layers is the most important reservoir. Dolomitic carbonates are dominant lithology in the 1,2,3layers and so, fracture density is high, especially in the first layer(90% Dolomite).Increasing of shale and Marle Layers in the 4,5,6 layers caused to decreasing of brittle property and fracture density is low. According to this research, Marun Anticline is a fault (thrust) related fold with faulted Detachment Fold mechanism. Two major fractures system in the Marun oil field could be recognized which are regional fractures (with east-west trending) and local fractures (fold and bending related fractures). The main fractured sectors, Marun Anticline are being seen in the southern limb and the eastern part of northern limb by curvature investigation (by Differential and Graphical methods).The results of Isopermeability, RFT, PI maps are consistable with the results of fracture study in order to identification of fractured sectors in the Marun Anticline