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Characteristics of hydrocarbon sources and controlling factors of their formation in Pingliang Formation, West Ordos Basin

机译：鄂尔多斯盆地西部平凉组烃源特征及其控制因素

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摘要

According to organic geochemistry and organic petrology, the hydrocarbon sources in Pingliang Formation, W. Ordos basin, are systematically evaluated. The organic abundance of hydrocarbon source in this research is higher in the upper part of profilesthan in the low, and more in mudstone than in carbonate. Most of organic matters become sapropelic, and few are humic-sapropelic in the regions of Shibangou and Zhuzisan. According to stable isotopes of carbon and oxygen in carbonate rock, boron index and ratios of elements, palaeo-salinity and sedimentary velocity are calculated. The two factors of paleao-salinity and sediment velocity, which control the distribution of organic matters, are discussed. Good relationship is found between water salinityand abundance of organic matter; in contrast, poor correlation is observed between salinity and types of organic matters. The relative sediment velocity in the research regions is also related with organic abundance and types. A low sediment velocity would lead to high abundance and good type of organic matters, and vice versa.
机译：根据有机地球化学和有机岩石学，系统地评价了鄂尔多斯盆地平凉组的烃源。在这项研究中，碳氢化合物源的有机丰度在剖面的上部高于下部，在泥岩中比在碳酸盐中更高。在石板沟和竹子三地区，大多数有机物变成腐泥菌，腐殖质-腐泥菌很少。根据碳酸盐岩中碳，氧的稳定同位素，计算了硼指数，元素比，古盐度和沉积速度。讨论了控制有机物分布的古盐度和沉积速度两个因素。盐度与有机质含量之间存在良好的关系;相反，盐度和有机物类型之间的相关性很差。研究区域的相对泥沙速度也与有机质丰度和类型有关。较低的泥沙速度将导致高丰度和良好的有机物类型，反之亦然。

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