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

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Science Bulletin 2007年第S1期 103-112页

作者： CHEN MengJin1, NING Ning2, HU GuoYi2 & LI Jian2 1 Ordos Branch of Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 2 Langfang Branch of Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China

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 profiles than 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 salinity and 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.

关键词： Ordos Basin pingliang formation abundance kerogen type palaeo-salinity sedimentary velocity

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甘肃平凉中-上奥陶统三道沟组和平凉组界线附近的牙形石/刺（英文）

甘肃平凉中-上奥陶统三道沟组和平凉组界线附近的牙形石/刺（英文...

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中国古生物学会第十二次全国会员代表大会暨第29届学术年会

作者：樊茹邓胜徽卢远征张师本李鑫马雪莹 Research Institute of Petroleum Exploration & Development PetroChina

The Guanzhuang section(also known as the pingliang section) located in pingliang City of Gansu Province,is well-known for being the type locality of the pingliang formation and being previously selected as one of the stratotype candidates for the base of the Upper Series of the Ordovician *** of the pingliang formation in this classic section have been extensively researched for ***,the lowermost few meters of this formation and the underlying Sandaogou formation were not included in these researches because of not being well exposed in the study *** results in poor knowledge of biostratigraphy of the pingliangSandaogou ***,a fresh outcrop of this interval is observed recently in a disused quarry,about 200 m west of the classic location of the Guanzhuang *** this new-found locality,the bottom of the pingliang formation consists of shale with intercalated limestone beds,and the top of the Sandaogou formation is characterized by medium to thick bedded *** from this interval are sampled and *** shows that fossils are not recovered from the bottom of the pingliang formation,but quite rich in samples collected from the top of the Sandaogou *** fauna represents 17 species and 14 genera,mainly including Pygodus anserinus,Erismodus typus,Microcoelodus asymmetricus,Periodon aculeatus,Spinodus spinatus,Protopanderodus varicostatus,*** and Panderodus *** Pygodus anserinus conodont biozone is *** biozone occurs in the lower part of the pingliang formation as well according to previous studies at the classic ***,it is evident that the pingliang formation conformably overlies the Sandaogou formation in the study area.

关键词： Conodont Middle-Upper Ordovician Sandaogou formation pingliang formation Gansu Province

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