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Data modelling for crude oil migration studies using ranking method: a rapid geo-tracer technique for geochemists

Acta Geochimica 2018年第6期37卷 901-910页

作者： Oluwabamise L.faboya Oluwadayo O.Sonibare olusola t.faboya Utkarsh Agrawal Zewen Liao O.Ekundayo Department of Chemical Sciences Afe Babalola University Department of Chemistry University of Ibadan School of Computer Science University of Nottingham State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences

the direction of oil charges within a field in the Niger Delta, Nigeria was determined by the sum of differences ranking method of carbazole concentrations after ascertaining other possible geological constraints on their compositional variations. the principle is that the smaller the sum, the closer the well to the source kitchen. the approach makes use of carbazoles' interaction with the matrix, which leads to a reduction in their concentration with increasing distance from the source kitchen, allowing prediction of the charging direction. A wide range of compositional variations was observed for C1(806.72–2152.90 lg/g) and C2(767–2469.72 lg/g) carbazoles within the field. Based on these results, we inferred a filling pathway orientation from west to east. this suggests that the source kitchen—the most promising region for oil exploration—is located in the western part of the oil field.

关键词： Carbazoles isomers Crude oils Charging direction Data modelling

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Distribution and geochemical significance of trace elements in shale rocks and their residual kerogens

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Acta Geochimica 2018年第6期37卷 886-900页

作者： Jian-bing Xu Bin Cheng Qian Deng Yun-gan Liang Oluwabamise Lekan faboya Ze-wen Liao Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou510640China University of the Chinese Academy of Sciences Beijing100049China

there is a dearth of information about the distribution of trace elements in kerogen from shale rocks despite several reports on trace element composition in many shale samples. In this study, trace elements in shale rocks and their residual kerogens were determined by inductively coupled plasma–mass spectrometry. the results from this study show redox-sensitive elements relatively concentrated in the kerogens as compared to the shales. this may be primarily due to the adsorption and complexation ability of kerogen, which enables enrichment in Ni, Co, Cu, and Zn. For the rare earth elements(REEs),distinct distribution characteristics were observed for shales dominated by terrigenous minerals and their kerogen counterparts. However, shales with less input of terrigenous minerals showed similar REE distribution patterns to their residual kerogen. It is speculated that the distribution patterns of the REEs in shales and kerogens may be sourcerelated.

关键词： Shale Kerogen trace elements REEs

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