بهزاد تخم چی
دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود
[ 1 ] - طبقه بندی سنگ های آهکی براساس خصوصیات سنگ‌شناسی و ترکیب شیمیایی با استفاده از روش پردازش تصویر و شناخت الگو
رویکرد پردازش تصویر، یکی از ابزارهای کاربردی در مقوله طبقه‌بندی و تشخیص دیجیتال نوع سنگ‌شناسی است. در این مقاله، تفکیک نمونههای سنگ آهک از نظر میزان خلوص کربنات کلسیم، با استفاده از کمّیسازی ویژگیهای تصویری نمونهها و الگوریتم آماری بیزین، مطالعه شده است. بدین منظور تعداد 30 نمونه سنگ آهک از معدنی در منطقه لاج سمنان برداشت شد. هریک از این نمونهها توسط سنگشکن فکی خرد و بخشهایی از ن...
[ 2 ] - Gas migration through cement slurries analysis: A comparative laboratory study
Cementing is an essential part of every drilling operation. Protection of the wellbore from formation fluid invasion is one of the primary tasks of a cement job. Failure in this task results in catastrophic events, such as blow outs. Hence, in order to save the well and avoid risky and operationally difficult remedial cementing, slurry must be optimized to be resistant against gas migration phe...
[ 3 ] - Comparison of Different Hydraulic Fracture Growth Models Based on a Carbonate Reservoir in Iran
There has been little interest in the application of hydraulic fracture treatment in Iranian oil fields, thanks to the primarily suitable production rates of the vast oil fields. In this paper, hydraulic fracturing treatment was simulated by different models for a carbonate reservoir in the southwest of Iran. Suitable pay zones were nominated based on the lithology, water-oil saturation, geomec...
[ 4 ] - Estimation of geochemical elements using a hybrid neural network-Gustafson-Kessel algorithm
Bearing in mind that lack of data is a common problem in the study of porphyry copper mining exploration, our goal was set to identify the hidden patterns within the data and to extend the information to the data-less areas. To do this, the combination of pattern recognition techniques has been used. In this work, multi-layer neural network was used to estimate the concentration of geochemical ...
[ 5 ] - Evaluation of effective factors in window optimization of fry analysis to identify mineralization pattern: Case study of Bavanat region, Iran
The known ore deposits and mineralization trends are important key exploration criteria in mineral exploration within a specific region. Fry analysis has conventionally been considered as a suitable method to determine the mineralization trends related to linear structures. Based upon literature sources, to date, no investigation has been carried out that includes the Sensitivity Analysis of Fe...
[ 6 ] - Determination of constant coefficients of Bourgoyne and Young drilling rate model using a novel evolutionary algorithm
Achieving minimum cost and time in reservoir drilling requires evaluating the effects of the drilling parameters on the penetration rate and constructing a drilling rate estimator model. Several drilling rate models have been presented using the drilling parameters. Among these, the Bourgoyne and Young (BY) model is widely utilized in order to estimate the penetration rate. This model relates s...
[ 7 ] - Studying empirical correlation between drilling specific energy and geo-mechanical parameters in an oil field in SW Iran
Multiplicity of the effective factors in drilling reflects the complexity of the interaction between rock mass and drilling bit, which is followed by the dependence of parameters and non-linear relationships between them. Rock mass or, in other words, the formation intended for drilling, as the drilling environment, plays a very essential role in the drilling speed, depreciation of drilling bit...
[ 8 ] - Permeability upscaling in fractured reservoirs using different optimized mother wavelets at each level
We use a multi-resolution analysis based on a wavelet transform to upscale a 3D fractured reservoir. This paper describes a 3D, single-phase, and black-oil geological model (GM) that is used to simulate naturally-fractured reservoirs. The absolute permeability and porosity of GM is upscaled by all the possible combinations of Haar, Bior1.3, and Db4 wavelets in three levels of coarsening. The ap...
[ 9 ] - The impact of poor cementing casing damage: A numerical simulation study
A good knowledge of the parameters causing casing damage is critically important due to vital role of casing during the life of a well. Cement sheath, which fills in the gap between the casing and wellbore wall, has a profound effect on the resistance of the casing against applied loads. Most of the empirical equations proposed to estimate the collapse resistance of casing ignore the effects of...
[ 10 ] - Application of Bayesian decision making tool in detecting oil-water contact in a carbonate reservoir
Detection of Oil-Water Contacts (OWCs) is one of the primary tasks before evaluation of reservoir’s hydrocarbon in place, determining net pay zones and suitable depths for perforation operation. This paper introduces Bayesian decision making tool as an effective technique in OWC detecting using wire line logs. To compare strengths of the suggested method in detecting OWC with conventional one, ...
[ 11 ] - Formation interface detection using Gamma Ray log: A novel approach
There are two methods for identifying formation interface in oil wells: core analysis, which is a precise approach but costly and time consuming, and well logs analysis, which petrophysists perform, which is subjective and not completely reliable. In this paper, a novel coupled method was proposed to detect the formation interfaces using GR logs. Second approximation level (a2) of GR log gained...
[ 12 ] - Limestone chemical components estimation using image processing and pattern recognition techniques
In this study based on image analysis, an ore grade estimation model was developed. The study was performed at a limestone mine in central Iran. The samples were collected from different parts of the mine and crushed in size from 2.58 cm down to 15 cm. The images of the samples were taken in appropriate environment and processed. A total of 76 features were extracted from the identified rock sa...
[ 13 ] - Displacement Discontinuity Analysis of the Effects of Various Hydraulic Fracturing Parameters on the Crack Opening Displacement (COD)
The combination of horizontal drilling along with hydraulic fracturing has significantly improved the production of hydrocarbon reservoirs and made it possible to extract the relatively impermeable and uneconomical reservoirs. The production rate of oil and gas wells increases proportional to hydraulic fracture aperture or crack opening displacement (COD). This is an important parameter i...
[ 14 ] - A New Approach towards Precise Planar Feature Characterization Using Image Analysis of FMI Image: Case Study of Gachsaran Oil Field Well No. 245, South West of Iran
Formation micro imager (FMI) can directly reflect changes of wall stratums and rock structures. Conventionally, FMI images mainly are analyzed with manual processing, which is extremely inefficient and incurs a heavy workload for experts. Iranian reservoirs are mainly carbonate reservoirs, in which the fractures have an important effect on permeability and petroleum production. In this paper, a...
[ 15 ] - شناسایی راک‌تایپ‌های مخزنی با استفاده از الگوریتم گوستافسون-کسل و تخمین‌گر لولیموت
تفکیک مخزن به بخش‌های هموژن از نظر ویژگیهای پتروفیزیکی مانند تخلخل و تراوایی را شناسایی راک‌تایپ‌های پتروفیزیکی می‌نامند. روش‌ها و معادلاتی متعدد برای بررسی راک‌تایپ‌های پتروفیزیکی وجود دارند: معادلات وینلند، معادلات پیتمن و شاخص کیفیت سنگ و ... . لازمه شناسایی و تفکیک زون‌های مخزنی برمبنای این ویژگی‌ها وجود مغزه است، ولی در اغلب چاه‌های نفت و حتی در تمام اعماق یک چاه مغزه‌گیری ممکن نیست، اما...
[ 16 ] - شناسایی شکستگی‌ها در نمودارهای تصویری الکتریکی با استفاده از تکنیک‌های پردازش تصویر و الگوریتم ژنتیک
در مخازن با شکستگی طبیعی، شکستگی‌ها نقش اساسی در تولید هیدروکربن ایفا می‌کنند. به همین دلیل، شناسایی شکستگی‌ها در جنبه‌های مختلف تولید و توسعه این میادین بسیار اهمیت دارد. نمودارهای تصویری، ابزاری بسیار قوی برای مطالعه شکستگی‌ها در چاه‌ها هستند. نمودار تصویری، یک شبه تصویر با تفکیک‌پذیری بالا از دیواره چاه می‌باشد. این نمودارها اطلاعات مهمی را درباره جهت‌گیری، عمق و نوع شکستگی‌های طبیعی فراهم م...
[ 17 ] - A comprehensive benchmark between two filter-based multiple-point simulation algorithms
Computer graphics offer various gadgets to enhance the reconstruction of high-order statistics that are not correctly addressed by the two-point statistics approaches. Almost all the newly developed multiple-point geostatistics (MPS) algorithms, to some extent, adapt these techniques to increase the simulation accuracy and efficiency. In this work, a scrutiny comparison between our recently dev...
[ 18 ] - New Approaches in 3D Geomechanical Earth Modeling
In this paper two new approaches for building 3D Geomechanical Earth Model (GEM) were introduced. The first method is a hybrid of geostatistical estimators, Bayesian inference, Markov chain and Monte Carlo, which is called Model Based Geostatistics (MBG). It has utilized to achieve more accurate geomechanical model and condition the model and parameters of variogram. The second approach is the ...
[ 19 ] - بهبود در نقشه‌های نواحی امیدبخش اکتشافی با استفاده از رویکرد ترکیبی فرایند تحلیل شبکه‌‌ای- تاپسیس
افزایش در صحت خروجی نقشه‌های نواحی امیدبخش اکتشافی و همچنین کاهش مساحت فضای جستجو در اکتشاف از اهداف اصلی پی‌جویی اکتشافی است. انتخاب صحیح روش تلفیق داده‌های اطلاعاتی که بیشترین تطابق را با ماهیت داده‌های مورد استفاده داشته باشد، اولین قدم در این راه است. با توجه به اینکه داده‌های اکتشافی عموماً بهصورت دوطرفه به یکدیگر وابسته‌اند و با توجه به شرط ارتباط یکطرفه در داده‌های مورد ارزیابی در روش ت...
[ 20 ] - Rock physical modeling enhancement in hydrocarbon reservoirs using Choquet fuzzy integral fusion approach
Rock physics models are widely used in hydrocarbon reservoir studies. These models make it possible to simulate a reservoir more accurately and reduce the economic risk of oil and gas exploration. In the current study, two models of Self-Consistent Approximation followed by Gassmann (SCA-G) and Xu-Payne (X-P) were implemented on three wells of a carbonate reservoir in the southwest of Ira...
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