泥质烃源岩的比表面与有机质关系研究进展及意义

doi:10.11743/ogg20120306

摘要/Abstract

摘要：

烃源岩中有机质的富集一直备受关注,研究有机质与比表面关系是认识有机质富集机理的重要方法之一。泥质烃源岩比表面的构成较为复杂,它与烃源岩的孔隙尺寸、岩石组分、矿物成分以及粘土矿物的内表面和外表面等因素密切相关;但是,比表面的各检测方法都有其局限性,如压汞法适用于检测介孔和大孔,氮气吸附法适合于微孔和外表面,EGME法适用于微孔和内表面等,因此,选择合适的检测方法研究泥质烃源岩的比表面特征至关重要。烃源岩中有机质的赋存方式不同,特别是可溶有机质,或以物理吸附方式附着于矿物的外表面,或以化学吸附方式进入矿物的内表面,这造成了有机质与比表面相关性的变化与差异。因此,在开展泥质烃源岩比表面研究时,既要关注岩石矿物及有机质赋存特征影响,也要依据研究目的选择合适的比表面检测方法。

关键词: 比表面积, 检测方法, 有机质富集, 泥质烃源岩

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

中图分类号:

TE135

朱晓军,蔡进功. 泥质烃源岩的比表面与有机质关系研究进展及意义[J]. 石油与天然气地质, 2012, 33(3): 375-384. doi: 10.11743/ogg20120306 Zhu Xiaojun,Cai Jingong. Progress and significance of research on relation between specific surface area and organic matter in argillaceous source rocks[J]. Oil & Gas Geology, 2012, 33(3): 375-384. doi: 10.11743/ogg20120306

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