Biodegradation and water washing effect on gasoline range hydrocarbons and quality of crude oils from HJN and MKM fields of upper Assam basin, India

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• 作者：Manoj Kumar Sarmah ; Srinivasan V. Raju
• 关键词：Oligocene ; Miocene ; gasoline ; Pristane ; Phytane ; Assam
• 刊名：Journal of the Geological Society of India
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：87
• 期：3
• 页码：327-336
• 全文大小：310 KB
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• 作者单位：Manoj Kumar Sarmah (1)
  Srinivasan V. Raju (1)
  
  1. Oil India Limited, P. O. Duliajan, Dist. Dibrugarh, 786602, Assam, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geology
  Geosciences
  Geography
  Mineralogy
  
• 出版者：Springer India, co-published with Geological Society of India
• ISSN：0974-6889

文摘

The crude oils from Oligocene and Miocene formation of upper Assam basin have moderate API gravity and significant wax content. Crude oils from HJN and MKM fields of upper Assam basin are being produced from Oligocene and Miocene sands. These oils are somewhat biodegraded in nature as evidenced from their API gravity, density, bulk composition, GC fingerprints and relative concentrations of compounds in the gasoline range. It is observed from whole oil gas chromatographic data that the lighter hydrocarbons are more effected as a result of biodegradation and water washing than the heavier components. In the gasoline range compounds highest degradation of n-alkanes are observed followed by iso- and cyclo- alkanes. The extent of the effect of biodegradation of the gasoline range compounds in crude oil samples cannot be illustrated by the concentrations of the compounds. The concentrations only describe qualitative differences in molecular composition. This difficulty can be overcome by using parameters called degradative loss (%). This parameter shows exactly how much loss or gain has taken place in the gasoline range compounds. Within the gasoline range compounds, n-alkanes, Benzene baring HJN 15 and MKM 14 and Toluene experienced degradative loss indicating effects of both biodegradation and water washing in these oils. Cyclo-alkanes are least effected by biodegradation followed by iso-alkanes in all the oils. The extent of biodegradation and water washing is different for each oils from HJN and MKM fields as indicated by the degradative loss (%) of the compounds in the gasoline range.