Stratigraphic Sequence and Horizon Relationship of Permian Wuerhe Formation in Northwestern Margin of Junggar Basin

Researchers have been confused by stratigraphic sequence and horizon relationship of Permian Wuerhe formation in Zhongguai-5-8 Zone and slope of west of Mahu sag for years.Until the mid 1980s and early 1990s,Ke-79 well in Zhongguai are and Ma-2 well in Mahu sag got mid-high yield commercial oil and gas flow in Permian Wuerhe formation one after another.Many geologic researchers attach importance to such a problem.With the development of further 3-D seismic data joining processing and further exploration in slope of Mahu sag,research has been done thoroughly and meticulously in recent years,by using drilling and biological data combining with seismic interpretation.It is confirmed that the Wuerhe formation belongs to the Upper Wuerhe formation of Upper Permian in Zhongguai-5-8 Zone and the Lower Wuerhe formation of Middle Permian in slope of Mahu sag.