Abstract: The Erlian basin has been made a target for oil and gas exploration only recently. From a preliminary analysis of the conditions of oil generation of the basin in the light of its regional geological setting and tile geochemical indices of the source rock, it is proposed that the dark mudstone containing abundant organic matter as source material of oil predominanly of the mixed type, is the main source rock of the basin. The threshold depth for oil occurrence in the various depressions is determined on the basis of oil generation ratio, reflectance of vitrinites, distribution of n-alkanes and the character of clay minerals.

摘要： 二连盆地是油、气勘探的新领域。本文结合区域背景,据几口参数井的生油岩有机地球化学指标,对盆地的生油条件进行初步分析。认为白彦花群暗色泥岩段是主要生油岩。该段有机质丰度商,生油母质类型以混合型为主。根据生油率、镜质体反射率、正烷烃分布及粘土矿物特征确定各凹陷的生油门限深度。