نوع مقاله : مقاله پژوهشی
نویسندگان
1 پردیس علوم و فناوری‌های نوین، دانشکده مهندسی نفت، دانشگاه سمنان
2 دانشکده مهندسی شیمی نفت و گاز، دانشگاه سمنان
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Summary
Khouriyan oil seepage is located in Semnan province. In this region, the most important petroleum system in this area is Qom Formation. By studying the samples taken from the oil seepage and using surface geochemical methods, the presence of hydrocarbon is studied in this region.
Introduction
Khouriyan oil seepage is located in Semnan province. In the past period, due to the flow of oil on the ground, this area was of a great strategic location. An important hydrocarbon system was discovered in central Iran around Qom and Varamin in 1959. Geochemical methods for exploring oil and gas were first used in Russia, then in Germany and the United States. In the study, methods like Rock-Eval pyrolysis, one of the most important methods for geochemical analysis of sedimentary organic materials, provides valuable information about the total organic matter (TOC), quality and type of organic matter, hydrocarbon migration conditions, thermal evolution production potential and the amount of hydrocarbon produced. Sulfur has tended to be considered as almost a contaminant rather than an integral component of petroleum. In this study, the isotope of sulfur () and the possible source of sulfur in this region have been analyzed. To determine the type of minerals in this study, XRD analysis was carried out on sample No. 7, which has the highest free hydrocarbon content.
Methodology and Approaches
In this study, Rock-Eval pyrolysis method, one of the most important methods for geochemical analysis of sedimentary organic materials has been utilized. Also, XRD analyzes and determination of soil pH in the region have been performed as surface geochemical methods and has been done the sulfur isotope and Atomic absorption has been done for the presence of iron ion in this region.
Results and Conclusions
The presence of hydrocarbons in this area has been confirmed by performing new surface geochemical methods in the southern Semnan. The presence of a high percentage of free hydrocarbons near macro seepage, according to the Rock-Eval pyrolysis analysis, shows the presence of hydrocarbons migrating from the reservoir through the fracture and porosity in the caprock to the surface. The low pH of samples and methane in the X-ray analysis reveals the presence of hydrocarbon resources in this region. The creation of an oxidation and enhancement environment for iron ions in the sample also testifies to the presence of hydrocarbon sources leaking to the surface. Organic sulfur along with gypsum and anhydrite minerals, the exhaust of hydrocarbon gases from the area around the well Khourian, and also the high odor of sulfur in the oil drains confirms the presence of Gach-i-turush in this area. According to the new method of geochemical and assessing the high potential of hydrocarbons in this area, for more complete studies more exploration wells should be drilled.
کلیدواژه‌ها [English]
کویر خوریان در موقعیت جغرافیایی 53 درجه و 28 دقیقه شرقی و 35 درجه و 28 دقیقه شمالی در 10 کیلومتری جنوب‌شرقی شهرستان سمنان و در استان سمنان قرار دارد. این کویر از شرق به کویر نمک سمنان و از غرب به رودخانه گیناب و کویر دلازیان محدود می‌گردد. عمده پهنه این کویر پوشیده از گنبدهای نمکی و در قسمت جنوب، دشتی است که متاثر از رودخانه گیناب تبدیل به زمین‌های پفکی قلیایی و باتلاق‌های گلی رسی می‌گردد. پوشش گیاهی در نواحی شمالی استپی و در مرکز و جنوب عمدتا گیاهان هالوفیت و شور پسند است. در دوره قاجاریه به دلیل جاری شدن نفت بر روی زمین، این منطقه از موقعیت استراتژیک خاصی برخوردار شد و بارها بر سر مالکیت و استخراج نفت از آن بین دولت‌های انگلستان و روسیه دست به دست شد. در قسمت جنوبی این کویر کماکان آثار و تجهیزات مورد استفاده روس‌ها برای استخراج نفت به چشم می‌خورد. قریه کوچک خوریان که در حوزه مرکزی شهرستان سمنان قرار دارد، جزو دهستان علا (کهلا) به شمار می‌رود که در 9 کیلومتری جنوب شرقی سمنان واقع است. چاه نفت در 5 کیلومتری جنوبی قریه واقع است که به کویر نمک جندق متصل میشود[1].
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