Different Adsorption/Occlusion Properties of Asphaltenes Associated with Their Secondary Evolution Processes in Oil Reservoirs

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• 作者：Zewen Liao ; Ansong Geng ; Alain Graciaa ; Patrice Creux ; Anna Chrostowska ; and Yaxue Zhang
• 刊名：Energy & Fuels
• 出版年：2006
• 出版时间：May 2006
• 年：2006
• 卷：20
• 期：3
• 页码：1131 - 1136
• 全文大小：110K
• 年卷期：v.20,no.3(May 2006)
• ISSN：1520-5029

文摘

In this work, two asphaltenes derived from the same set of source rocks, C1 from a crude oil and C2 froman oil sand, were studied, concerning their adsorption/occlusion properties. From the adsorbed components,saturated and aromatic hydrocarbon distributions are distinctly different for these two asphaltenes. For example,some n-alkanes and alkyl-branched alkanes were found adsorbed in C2 asphaltenes, whereas only some cycliccompounds, particularly terpanes were detected from C1 asphaltenes. This difference is due to their differentevolution processes in oil reservoirs, and the exchangeability between asphaltene-sorption compounds andthose from outside of the bulk phase is different for these two asphaltenes. However, from the asphaltene-occlusion compounds, saturated hydrocarbons show almost the same distribution features. This is consistentwith the fact that these two asphaltenes were derived from the same set of source rocks, therefore, occludedalmost the same original oils from the source rocks. The experimental results suggest that substantial microporousunits exist inside the macromolecular structures of asphaltenes and the asphaltene-derived adsorption/occlusionphenomena extensively occur in oil reservoirs. It seems that asphaltene occlusion should have taken placebefore asphaltene was detached from kerogen.