DIVISION AND CORRELATION OF UPPER PERMIAN-LOWER TRIASSIC IN MIDDLE PART OF HENAN AND DISCUSSION ON SOME GEOLOGICAL TOPICS

The relationship between the sequences of Permian and Triassic is previously considered as conformable contact.The author of this paper suggests there is a depositional break between Shiqainfeng Formation of Upper Permian and Fangshan Formation of Lower Triassic,according to the analysis and correlation of observed informations from plenty of outcrop sections and well loggings.That is to say there is an uplift movement at the end of Shiqainfeng Formation (the end of Varisian movement).It is believed that the relationship between the sequences of Permian and Triassic is disconformable contact which would certainly influence the generation,migration and accumulation of oil/gas in the coal measure of this area.