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The petrological characteristics and signif icance of organic-rich shale in the Chang 7 member of the Yanchang Formation,south margin of the Ordos basin,central China

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Petroleum Science 2019年第6期16卷 1255-1269页

作者： Sen Li Ru-Kai Zhu Jing-Wei Cui Zhong Luo Jing-Gang Cui Han Liu Wei-Qiang Li Research Institute of Petroleum Exploration and Development Beijing 100083China Tight Oil and Gas Research Center of National Energy Beijing 100083China Key Lab of Oil and Gas Reservoir of PetroChina Beijing 100083China

The organic-rich shale of the Chang 7 member is the most important source rock in the Ordos basin.The sedimentary environment and the controlling factors of organic matter enrichment,however,are still in contention.In this investigation,the Yishicun outcrop,located on the south margin of the Ordos basin,has been considered for the study.X-ray diffraction,polarizing microscopy,field emission scanning electron microscopy and cathodoluminescence(CL)were used to investigate the petrological features of the organic-rich shale.The content of volcanic ash and the diameter of pyrite framboid pseudocrystals were measured to illustrate the relationship between oxygen level,ash content and the enrichment of organic matter.It has been found that the diameter of pyrite framboid pseudocrystals has a strong correlation with the total organic carbon,demonstrating that the redox status degree of the water column has a positive impact on the enrichment of organic matter.Additionally,with an increase in the ash content,the content of organic matter increased at first and then decreased,and reached a maximum when the ash content was about 6%,illustrating that the ash input has a double effect on the enrichment of organic matter.

关键词： Organic-rich shale Volcanic ash framboidal pyrite pseudocrystal Chang 7 member Ordos basin

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