对超压特征和形成机制的研究有利于提出识别超压地层的有效方法和预测超压。准噶尔盆地南缘为新近纪以来的再生前陆盆地,从白垩系到新近系都有超压发育,其主要成因是泥岩欠压实作用和构造应力挤压作用。南缘中段独深1井和安6井超压段的钻井和测井响应研究证明,研究区主要由欠压实作用引起的超压,泥岩中具有高时差、低密度和低视电阻率值特征;主要由构造应力挤压引起的超压,泥岩中具有接近正常声波时差趋势和高视电阻率的特征。 The study of overpressure features and formation mechanism is propitious to propose an effective method to identify overpressure strata and predict overpressure. The southern margin of the Junggar Basin is a reclaimed foreland basin since the Neogene, with overpressure development from the Cretaceous to the Neogene. The main causes of mudstone are under-compaction and tectonic stress extrusion. Drilling and well logging responses of over-pressure section of Dushan-1 well and An-6 well in the middle margin of the southern margin show that the overpressure caused by under-compaction mainly in the study area has high time-lag, low density and low apparent resistivity Features; Overpressure mainly caused by tectonic stress extrusion, mudstone with near-normal acoustic jet lag and high apparent resistivity.