【摘要】 依据内蒙古自治区海拉尔盆地北部Hong-5井1 631～2 270m井段8块样品的孢粉鉴定数据，建立了Cicatricosisporites-Protoconiferus-Perinopollenites孢粉组合，其特征为裸子植物花粉百分含量(82.29%～93.08%)远高于蕨类植物孢子百分含量(6.92%～17.71%),Protoconiferus和Perinopollenites百分含量高是本组合的突出特征，出现了下伏塔木兰沟组没有的早白垩世孢粉类型Cicatricosisporites、Aequitriradites、Pilosisporites、Maculatisporites、Fixisporites、Exesipollenites、Jiaohepollis、Erlianpollis和Parvisaccites等，可作为邻井地层对比的孢粉地层学标准。组合中早白垩世孢粉特征分子数量虽然较低，但类型较丰富，同时古松柏类花粉类型多样，百分含量高(6.62%～24.22%),海金砂科分子类型尚未达到多样化且百分含量低，可确定其地质时代为Berriasian—Valanginian期。Hong-5井1 631～2 270m井段孢粉组合特征可与Hong-6井铜钵庙组上部的孢粉组合对比，因此该井段可划归到铜钵庙组，解决了该井段地层层位归属问题。更多还原

【Abstract】 Based on sporopollen examination data of 8 samples from depth 1,631～2,270 m segment of the well Hong-5 in the Hailar Basin northern part, Inner Mongolia have established a Cicatricosisporites-Protoconiferus-Perinopollenites sporopollen assemblage with features of gymnosperm pollen percentage 82.29%～93.08% thus well above percentage of pteridophyte spore 6.92%～17.71%. The high percentages of Protoconiferus and Perinopollenites are prominent features of the assemblage. Early Cretaceous palynomorphs Cicatricosisporites, Aequitriradites, Pilosisporites, Maculatisporites, Fixisporites, Exesipollenites, Jiaohepollis, Erlianpollis and Parvisaccites etc have not been appeared in the underlying Tamulangou Formation, thus can be a palynostratigraphic criterion in correlation with neighboring well strata. Although the number of early Cretaceous sporopollen characteristic elements are lower, but the types are abundant, at the same time with various types and high percentages(6.62%～24.22%) of coniferous pollen, as well as the Lygodiaceae elements not yet been diversified and low percentage, thus geological age of the segment can be assigned into the Berriasian—Valanginian. The sporopollen assemblage features of the depth 1,631～2,270 m segment in well Hong-5 can be correlated with sporopollen assemblage in the upper part of Tongbomiao Formation in well Hong-6, so that the segment can be put under Tongbomiao Formation and solved the issue of stratigraphic horizon ascription of the segment.更多还原