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泥质烃源岩中<2μm黏粒级组分的有机质与比表面关系

, PP. 634-641

Keywords: 黏粒级,有机质,比表面积,赋存特征

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Abstract:

?选取东营凹陷13块烃源岩岩芯,提取<2μm黏粒级组分,对氯仿抽提前后样品分别进行热解分析和N2吸附法比表面积测试,探讨了黏粒级组分有机质与比表面积(SBET)的关系.结果显示:(1)黏粒级组分中不同赋存态有机质共存,不同演化阶段对生烃贡献有差异,并影响了黏粒级组分SBET的测定;(2)黏粒级组分有机质与比表面积关系受多种因素影响,TOC含量与SBET呈非线性负相关;(3)黏粒级组分的孔隙是可溶有机质的主要赋存空间,氯仿沥青“A”含量与SBET呈负相关;(4)游离态烃类(S1)主要赋存空间为黏粒级组分的孔隙或表面,热解烃(S2)则以与黏土矿物相结合形式存在.泥质烃源岩<2μm黏粒级组分中不同赋存态有机质的研究及与比表面关系的探讨,对有机质生烃、烃类聚集和运移研究都有重要意义.

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