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مدل‌سازی عددی مخزن زمین‌گرمایی در محیط غیراشباع (مطالعۀ موردی: میدان زمین‌گرمایی شمال‌غرب سبلان) | ||
| فصلنامه سیستم های انرژی پایدار | ||
| دوره 1، شماره 4، مهر 1401، صفحه 311-327 اصل مقاله (1.75 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ses.2023.355432.1024 | ||
| نویسنده | ||
| میرمهدی سیدرحیمی نیارق* | ||
| دانشیار، دانشکدۀ فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل | ||
| چکیده | ||
| در این پژوهش، ابتدا یک مدل مفهومی طراحی‌شده از 10 چاه عمیق اکتشافی توسعه داده شده و بر این اساس، مدل عددی سه‌بعدی از سیستم زمین‌گرمایی شمال غرب سبلان ارائه شده است. به همین منظور، برای شبیهسازی مدل از مدول EOS3 (معادلۀ حالت آب- هوا) کد شبیهساز Tough2 استفاده شده است. مدل عددی مخزن با یک منشور مستطیلی با km 5/11 طول و km 8 عرض (km2 92) و km 11/5 عمق بیان شده و با 21 لایۀ افقی با محدودۀ ضخامت 100 تا 1000 متر از ماکزیمم ارتفاع 4110 تا 1000- متر از سطح دریا گسترش داده شده است. تعداد 22 تیپسنگ که توزیع آنها بر اساس توزیع واحدهای سنگی و ساختارهای زمینشناسی در 10 چاه اکتشافی عمیق بنا نهاده شده است، به مدل اختصاص داده شد. نفوذپذیری این ساختارهای زمین از 17-10×1 تا 13-10×9 مترمربع متغیر است. مدل‌سازی برای حالت طبیعی مخزن انجام شد و نتایج اعتبارسنجی، تطبیق خوبی بین دادههای اندازهگیریشده درون‌چاهی و مدل‌سازی انجام‌شده برای دما و فشار را نشان می‌دهد. در بهترین حالت تطبیق، شبیهسازی یک زون جریان دما بالای رو به بالا در بخش جنوب شرقی محدوده (زیر سایتهای D و E)، فراهم کرد. این جریان از طریق زونهای نفوذپذیر، گسلی و شکسته انتقال می‌یابد و درنهایت، از طریق سیماهای سطحی (چشمههای آبگرم) در بخش شمال غربی ناحیه تخلیه میشود. نتایج مطالعه مدل مفهومی مناسبی از مخزن زمین‌گرمایی سبلان را ارائه می‌دهد که میتواند در توسعههای آتی مخزن استفاده شود. | ||
| کلیدواژه‌ها | ||
| محیط غیراشباع؛ حالت طبیعی مخزن؛ سیستم زمین‌گرمایی؛ شمال‌غرب سبلان | ||
| عنوان مقاله [English] | ||
| Numerical modeling of geothermal reservoir in unsaturated environment (Case study: Geothermal field northwest of Sabalan) | ||
| نویسندگان [English] | ||
| Mirmahdi Seyedrahimi-Niaraq | ||
| Faculty of engineering, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| چکیده [English] | ||
| In this research, firstly, a conceptual model designed of ten deep exploratoration wells has been developed, and based on this, a three-dimensional numerical model of the North-West Sablan geothermal system has been presented. For this purpose, the EOS3 module (water-air equation) of the Tough2 simulator code was used to simulate the model. The numerical model of the reservoir is expressed by a rectangular prism with a length of 11.5 km, a width of 8 km (92 km2) and a depth of 5.11 km, and it was expanded with 21 horizontal layers with a thickness range of 100 to 1000 meters from the maximum altitude of 4110 to -1000 masl. The number of 22 rock-types, whose distribution is based on the distribution of rock units and geological structures in 10 deep exploratory wells, was assigned to the model. The permeability of the rock types varies from 1*10E-17 to 9*10E-13 square meters. Modeling was done for the natural state of the reservoir and the validation results showed a good match between the data measured in the well and modeled for temperature and pressure. In the best fit, the simulation provided a zone of high temperature upward flow in the southeastern part of the range (sites D and E). This flow is transferred through permeable, faulted and fractured zones and is finally discharged through surface features (hot water springs) in the northwestern part of the area. | ||
| کلیدواژه‌ها [English] | ||
| Numerical modeling, Unsaturated environment, The natural state of the reservoir, geothermal system, Northwest of Sabalan | ||
| مراجع | ||
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