Applications of electron microprobe analysis (EPMA) in the study of Venezuelan source rocks: La Luna and Querecual Formations

S. Lo Monaco; L. Lopez; H. Rojas; P. Lugo; D. Garcia; J. Gastiel

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Applications of electron microprobe analysis (EPMA) in the study of Venezuelan source rocks: La Luna and Querecual Formations

机译：电子微探针分析（EPMA）在委内瑞拉烃源岩La Luna和Querecual地层研究中的应用

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This work presents the electron probe for microanalysis (EPMA) study of Venezuelan source rocks for stylolites (Querecual Formation), framboids (La Luna Formation), and kerogen (La Luna and Querecual Formations). Distributions of major and trace elements were studied to determine the elemental association with inorganic (minerals) and organic phases (kerogen). In the Querecual Formation an association of S with Fe, Cu, Zn, and Ni was observed in the stylolites, suggesting the presence of authigenic sulfides, whereas V and Ni are associated with organic matter. In the La Luna Formation, massive and framboidal pyrite was observed, in some cases surrounded by sphalerite; also an association of S with Fe (pyrite) and Ni with Zn (in a lower proportion) was observed. This suggests that Ni and Zn coprecipitate with pyrite, but that Zn also forms a separate phase (sphalerite). In these samples Ni is associated both with the sulfide phase and the organic matter, but V is only associated with the latter. In kerogen from La Luna and Querecual Formation, elemental mapping shows that V is associated with kerogen; it also demonstrates the presence of inorganic phases by elemental associations among C, Ca, and Mg (carbonates); Al, Si, and K (aluminosilicates); and S, Fe, Co, Cu, Zn, and Ni (sulfides); these latter also seem to be associated with kerogen. This means that acidic attack on kerogen does not completely separate mineral phases, possibly because organic matter may be surrounding mineral phases, thus inhibiting this attack. These results demonstrate EPMA potential for studies on the distribution of major and trace elements in source rocks.

机译：这项工作提出了用于委内瑞拉源岩的微分析电子探针（EPMA），用于定型针石（Querecual地层），黄石类（La Luna地层）和干酪根（La Luna和Querecual地层）。研究了主要和微量元素的分布，以确定与无机（矿物）和有机相（干酪根）的元素缔合。在古地层中，在斜长石中观察到S与Fe，Cu，Zn和Ni的缔合，表明存在自生硫化物，而V和Ni与有机物缔合。在拉鲁纳组中，观察到块状黄铁矿黄铁矿，在某些情况下被闪锌矿包围。还观察到S与Fe（黄铁矿）和Ni与Zn（比例较低）的缔合。这表明Ni和Zn与黄铁矿共沉淀，但是Zn也形成单独的相（闪锌矿）。在这些样品中，Ni与硫化物相和有机物有关，而V仅与后者有关。在La Luna和Querecual地层的干酪根中，元素图谱显示V与干酪根相关。它还通过C，Ca和Mg（碳酸盐）之间的元素缔合证明了无机相的存在。 Al，Si和K（铝硅酸盐）； S，Fe，Co，Cu，Zn和Ni（硫化物）；后者似乎也与干酪根有关。这意味着对干酪根的酸性侵蚀不会完全分离出矿物相，这可能是因为有机物可能围绕在矿物相周围，从而抑制了这种侵蚀。这些结果证明了EPMA在研究烃源岩中主要和微量元素分布方面的潜力。

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来源
《Fuel》 |2007年第6期|p.641-648|共8页
作者
S. Lo Monaco; L. Lopez; H. Rojas; P. Lugo; D. Garcia; J. Gastiel;
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作者单位

Instituto de Ciencias de la Tierra, Facultad de Ciencias, Universidad Central de Venezuela, Apdo. 3895, Caracas 1010-A, Venezuela;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类燃料化学工业（总论）;热力工程、热机;
关键词
electron microprobe; source rock kerogen; la luna and querecual formation;

机译：电子探针;干酪根来源;月球和成岩作用;

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Applications of electron microprobe analysis (EPMA) in the study of Venezuelan source rocks: La Luna and Querecual Formations

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