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منشا گازهای هیدروکربوری در گل‌فشان‌های جنوب‌شرق دریای خزر (دشت گرگان) براساس ترکیب مولکولی و ایزوتوپی کربن و هیدروژن
بهزاد مهرابی, آدریانو مازینی, مهین فرهادیان, الینا پلودتکینا, سالواتوره اینگواگیاتو

چکیده

گل­فشان­ها پدیده­های رایج در مناطق خشکی و ساحلی با تکتونیک فشارشی و رسوب­گذاری بالا هستند که اهمیت زیادی برای تحقیقات در زمینه فعالیت­های تکتونیکی، محیط­های رسوبی و تجمعات نفت و گاز دارد. در این مطالعه، سه گل­فشان قارنیاریق، صوفیکم و نفتلیچه در دشت گرگان توصیف و منشا گازهای هیدروکربوری آن­ها (به صورت گاز آزاد و گاز محلول در رسوبات) بررسی می­شود. ترکیب گازهای سه گل­فشان شامل مقدار بالایی از گاز متان (۶۸/۹۰ تا vol.% ۷۴/9۹) و مقادیر کمی اتان، پروپان و همچنین ایزو-بوتان در قارنیاریق و نفتلیچه است. منشا گازهای خارج­شده از گل­فشان­ها براساس ترکیب مولکولی و نسبت ایزوتوپی کربن و هیدروژن در صوفیکم (‰74-δ13CCH4=)، احیا باکتریایی کربنات و در قارنیاریق (‰2/52-δ13CCH4=) و نفتلیچه (‰2/52-δ13CCH4=) مخلوط (ترموژنیک-بیوژنیک) تشخیص داده­ شد. اگرچه مقدار کمی اتان (ppmv358) در گازهای برداشت شده از صوفیکم نشاندهنده­ حضور مقدار کمی گازهای ترموژنیک است. ترکیب ایزوتوپی کربن CO2 با مقدار ‰14/3+δ13CCO2=فرآیند تجزیه­زیستی غیرهوازی در گل­فشان نفتلیچه را نشان می­دهد. مقادیر نسبت ایزوتوپی رادیوژنیک 3He/4He نیز بیانگر منشا پوسته­ای گازهاست. حضور گازهای ترموژنیک در گل­فشان­های دشت گرگان می­تواند نشاندهنده­ پتانسیل هیدروکربوری این منطقه باشد.

واژگان کلیدی
گل‌فشان‌، ترکیب مولکولی و ایزوتوپی گازهای هیدروکربوری، منشا گازها‌، دشت گرگان‌، صوفیکم، قارنیاریق و نفتلیچه.

منابع و مآخذ مقاله

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