Research on preservation and enrichment mechanisms of organic matter in muddy sediment and mudstone

被引:61
作者
Cai JinGong [1 ]
Bao YuJin
Yang ShouYe
Wang XingXin
Fan DaiDu
Xu JinLi
Wang AiPing
机构
[1] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
[2] Shengli Oil Co, Inst Earth Sci, Dongying 257015, Peoples R China
来源
SCIENCE IN CHINA SERIES D-EARTH SCIENCES | 2007年 / 50卷 / 05期
基金
中国国家自然科学基金;
关键词
clay minerals; dissoluble organic matter; organo-clay complexes; organic-matter enrichment mechanisms;
D O I
10.1007/s11430-007-0005-0
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Using multidiscipline methodologies, the differences in preservation and enrichment mechanisms of organic matter (OM) in muddy sediment and mudstone are investigated. In clay fractions, concentrations of TOC and chloroform bitumen "A" are significantly higher than those in coarser fractions. This indicates that clay minerals (CM) play an important role in enriching OM. The content of chloroform bitumen "A" increases obviously in the clay fraction, which reveals that dissolvable OM is the main composition of coalesce with clay minerals. Furthermore, TG and DTA data show that OM enrichment mechanisms and preservation forms have multiplicity. Several exothermic peaks in the DTA curves demonstrate that muddy sediment and mudstone contain a number of bioclasts and amorphous OM besides dissolvable OM. Through analyzing with XRD and DTA after mudstone samples were pretreated, the conclusions can be arrived at. Firstly, CM interlayer space of XRD curves and exothermic peaks of DTA curves both change as temperature increases. Secondly, the changes of CM interlayer space and exothermic peaks are concordant and stable around 350 degrees C. All these are the features that OM enters CM interlayers to form stable organo-clay complexes. Therefore, the combination format of OM with CM is not only surface adsorption, partial OM enters CM interlayers to form stable organo-clay complexes. Finally, through the research on OM preservation forms and enrichment mechanisms in muddy sediment and mudstone, the hydrocarbon-generation processes and the global carbon cycle and budget can be explained.
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页码:765 / 775
页数:11
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