Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (3): 375-384.doi: 10.11743/ogg20120306

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Progress and significance of research on relation between specific surface area and organic matter in argillaceous source rocks

Zhu Xiaojun, Cai Jingong   

  1. State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
  • Received:2011-12-07 Revised:2012-05-15 Online:2012-06-28 Published:2012-07-10

Abstract:

The enrichment of organic matter in source rocks is a topic of concern and studying the relation between organic matter and specific surface is important to recognizing the enrichment mechanism of organic matter.Specific surface area of argillaceous source rocks is complex in components and is controlled by various factors such as pore size,components,mineral constituents,inner surface and external surface of clay minerals.Each measuring method for specific surface area has its own limitations.For example,mercury porosimetry is suitable for measuring mesopores and macropores,nitrogen adsorption method is the best in measuring micropores and external surface,and EGME method is fit for measuring micropores and inner surface.Therefore,it is crucial to choose the right method to detect the specific surface area of argillaceous source rocks.The occurrence modes are different for different organic matters,especially the soluble organic matter,which is absorbed on the external surface of minerals by physical adsorption,or enters into the inner surface of minerals via chemical adsorption.All of these result in the variations and differences of the correlation between organic matter and specific surface.Consequently,in addition to the features of minerals and organic matter's occurrence,it should be paid attention to find the suitable method to determine the specific surface area in argillaceous source rocks.

Key words: specific surface area, detection method, enrichment of organic matter, argillaceous source rock

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