Characterization and Identification of Gas Hydrate Bearing Sediments of Oman Sea Using Seismic Methods

توضیحات

ABSTRACT
Gas hydrates attracted worldwide attention due to their potential as huge energy resource in the recent decades. Therefore identifying and prospecting them is essential for strategic hydrocarbon reservoir management. Seismic methods are known as a powerful gas hydrate exploration methodology. In this research pre-stack seismic attributes have been used to identify elastic properties and qualitative hydrate  saturation of sediments. Using AVO analysis on pre-stack seismic data, occurrence of gas hydrate has been confirmed in the Oman Sea. Also  post-stack seismic meta-attributes (applying pattern recognition and classification methods on several attribute planes) have been successfully used to make separation between hydrate and non-hydrate sediments. Joint use of pre- and post-stack seismic attributes will be a good evaluation techniques for confirmation of this study.

INTRODUCTION

Gas Hydrates are a kind of unconventional gas resources which are found below the surface of the earth, in polar zones, deep seas and  oceans. They are naturally occurring crystalline material compose of water and light hydrocarbons (mainly methane), which gas molecules are entrapped in cage consist of water molecules . For the first time, gas hydrates were found in 19th century by Davy . In 1930, formation of  gas hydrate in gas pipelines and their obstruction effect attract more attention to them in oil exploration industry . In 1980s, they were  exploited in marine areas of Mexico ; thereafter their presence was reported in Pacific and Athlantic oceans . Abundant presence of methane  which is considered as a clean fossil fuel is seen in gas hydrate sediments. The amount of stored methane in 1 m3 of methane hydrate is equal to 164 m3 of methane gas in standard pressure and temperature. Gas hydrates contain more than half of the organic carbon of the earth .  Therefore, they become an enormous resource of natural gas and are considered as a main energy resource for future.  But their importance has other aspects. The occurrence of gas hydrate makes the sediments vulnerable to physical and chemical changes in the surface of the  earth. The changes in the environmental conditions may lead to destabilize hydrates and it may cause release of large amount of gas in the  atmosphere. It also can cause slope instability of the seabed.

Year: 2013

Publisher :  2nd National Iranian Conference on Gas Hydrate (NICGH)

By : M.Sarmadi Doost , F.Erfani , H.Hashemi , M.Sokooti , M.Sadiq-Arabani

File Information: English Language/ 12 Page / size: 1,11 KB

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سال : 1392

ناشر : دومین کنفرانس ملی هیدرات گاز (NICGH)

کاری از : اقای صرمدی دوست , عرفانی ,اقای سکوتی ,اقای صدیق-اربانی

اطلاعات فایل : زبان انگلیسی / 12 صفحه / حجم : KB 1,11

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