安徽宿松栖霞组古代上升流强度及其特征

No consensus has been reached yet about the characterization method of Ancient Upwelling,the thickness of deposition can be obtain by the field observation, adoption of percentage of upwellingmale accumulation deposit thickness to layer thickness are calculated the upwelling strength,the evolution feature of upwelling strength is then analyzed. The upwelling deposit of Qixia Formation is mainly in 7-14 layers and 17-21 layers，from bottom to top ,the upwelling strength shows the change tendency from weakness to strength to weakness. Under the same sedimentary microfacies,the upwelling strength shows the change characteristic from strength to weakness. In the four sedimentary microfacies of upwelling, the greatest upwelling strength is silicalite microfacies, the lowest upwelling strength is chert strip micritic microfacies,too high or too low strength of the upwelling is bad to form the fine hydrocarbon source rocks, the research suggested that the fine hydrocarbon source rocks can form while the upwelling strength in the range of 20%-50%.