Hydrocarbon Generation,Migration,and Accumulation in the Eocene Niubao Formation in the Lunpola Basi

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The Eocene Niubao Formation is the primary research target of oil exploration in the Lunpola Basin.Crude oil was extracted from Well Z1 on the north margin of the basin in 1993.In this study,an integrated evaluation of the source rock,geothermal,and maturity histories and the fluid inclusion and fluid potential distributions was performed to aid in predicting areas of hydrocarbon accumulation.Due to the abundance of organic matter,the kerogen types,maturity,and oil-sources correlate with the geochemical data.The middle submember of the second member of the Niubao Formation(E2n2-2)is the most favorable source rock based on the amount of oil produced from the E2n2-3 and E2n3-1 reservoirs.One-and two-dimensional basin modeling,using BasinMod software,shows that the E2m2-2 source rock started to generate hydrocarbon at 35-30 Ma,reached a maturity of Ro=0.7%at 25-20 Ma,and at present,it has reached the peak oil generation stage with a thermal maturity of Ro=0.8%to less than Ro=1.0%.By using fl.uid inclusion petrography,fl.uorescence spectroscopy,and microthermometry,two major periods of oil charging have been revealed at 26.1-17.5 and 32.4-24.6 Ma.The oil accumulation modeling results,conducted by using the Trin-ity software,show a good fit of the oil shows in the wells and predict that the structural highs and lithologic transitions within the Jiangriaco and Paco sags are potential oil traps.
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