Hydrocarbon Accumulation And Petroleum Formation In The Northern Margin Of Jiangnan Uplift

Jiangnan Uplift is located between the Yangzi Plate and Huaxia plate. There are many oil and gas showing and paleo-reservoir in northern margin of Jiangnan uplift. The research of paleo-reservoir anatomization and contrast can open out the law of reservoir distribution. The study of hydrocarbon accumulation and reservoir destruction in Palaeozoic offer the exploration direction of discover reservoir in low metamorphosed and well saved place. So it is nessary and important to strengthen research of paleo-reservoir for exploration in Palaeozoic.This paper analyses the asphalt characteristic and its composition that paleo-reservoir remained to verdict asphalt source and attribute. "IES" basin model is used to analyze the burial history and hydrocarbon forming history of paleo-reservoir. Asphalt of reservoir and hydrocarbon enclosure is used to verify the reservoir forming time. These ways are used to anatomize and contrast paleo-reservoir in order to find out the process of paleo-reservoir forming and destruction.Majiang paleo-reservoir is unisource paleo-reservoir. The source rock is Lower Cambrian. Reservoir bed are karsts carbonate rock of Ordovician Honghuayuan. formation (O₁h) and sandstone of Lower Silurian Wengxiang formation (S₁₊₂wn). Cap rock is mud rock of Middle-upper Wengxiang formation. The trap is opened anticline zone formed during Caledonian. Hydrocarbon peak production of source rock is from Laster Silurian to Early Devonian, and during this period the originality reservoir formed. The originality reservoir was uplifted in Guangxi tectogenesis epoch, and the cap rock was disintegrated so the originality reservoir was oxygenated. From Middle Carboniferous to Middle Triassic the originality reservoir pyrolysised to gas pool and asphalt. From Yanshan to Himalayan epoch the crust uplifted and stratum was disintegrated, gas pool was destructed and Majiang paleo-reservoir formed.Kaili remainder reservoir is multiple source reservoir and has two petroleum system. Source rock are Lower Cambrian and Lower-Middle Silurian. Reservoir bed are dolostone emposieu, cave and crack of Sinian Dengying formation (Z₂dy) , limestone crack of Lower Cambrian Jiumencong formation (∈₁jm) , karst carbonate rock of Ordovician Honghuayuan formation (O₁h) and sandstone of Lower Silurian Wengxiang formation (S₁₊₂wn) . Cap rock is mud shale rock of Lower Cambrian Jiumencong, Bianmacong and Palang formation, Silurian Middle-upper Wengxiang...