海拉尔盆地Hong-5井早白垩世孢粉组合及其地质意义  

Early Cretaceous Sporopollen Assemblage and Its Geological Significance in Well Hong-5,Hailar Basin

作　　者：张艳[1,2,3] 薛云飞 卜春阳[3] 刘学生[4] 李倜 张昕 金玉东[3] 万传彪[3] 孙跃武[2] Zhang Yan;Xue Yunfei;Bu Chunyang;Liu Xuesheng;Li Ti;Zhang Xin;Jin Yudong;Wan Chuanbiao;Sun Yuewu(College of Earth Sciences,Jilin University,Changchun,Jilin 130061;Research Center of Paleontology and Stratigraphy,Jilin University,Changchun,Jilin 130026;Exploration and Exploitation Research Institute,Daqing Oilfield Co.Ltd,Daqing,Heilongjiang 163712;Geological Survey of Jilin Province,Changchun,Jilin 130102)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学古生物学与地层学研究中心,长春130026 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [4]吉林地质调查院,长春130102

出　　处：《中国煤炭地质》2022年第2期34-42,共9页Coal Geology of China

基　　金：国家自然科学基金项目(41972012)。

摘　　要：依据内蒙古自治区海拉尔盆地北部Hong-5井1631~2270m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1631~2270m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。Based on sporopollen examination data of 8 samples from depth 1,631~2,270m 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 1,631~2,270m 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.

关 键 词：海拉尔盆地 Hong-5井 铜钵庙组 孢粉组合 Berriasian—Valanginian期 

分 类 号：P534.53[天文地球—古生物学与地层学]