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缅甸英雄岛始新世孢粉组合及其古环境意义

史德锋 祝幼华

史德锋, 祝幼华. 缅甸英雄岛始新世孢粉组合及其古环境意义[J]. 石油实验地质, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136
引用本文: 史德锋, 祝幼华. 缅甸英雄岛始新世孢粉组合及其古环境意义[J]. 石油实验地质, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136
SHI Defeng, ZHU Youhua. Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136
Citation: SHI Defeng, ZHU Youhua. Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 136-145. doi: 10.11781/sysydz202401136

缅甸英雄岛始新世孢粉组合及其古环境意义

doi: 10.11781/sysydz202401136
基金项目: 

中国科学院战略性先导科技专项 XDB26000000

详细信息
    作者简介:

    史德锋:史德峰(1987-), 男, 硕士, 工程师, 从事油气勘探研究。E-mail: shidf@cnooc.com.cn

    通讯作者:

    祝幼华(1965-), 女, 教授, 从事中、新生代海相微体藻类生物地层及沉积环境研究。E-mail: yhzhu@nigpas.ac.cn

  • 中图分类号: TE121.31

Eocene sporopollen assemblage from Ramree Island, Myanmar and its palaeoenvironment significance

  • 摘要: 为配合中缅合作的M区块油气勘探,确定该区块英雄岛含油气地层时代与沉积环境,对缅甸英雄岛R-3井2 562~2 844 m井段10个烃源岩样品进行了孢粉实验分析。通过观察,在每个样品中均发现了较丰富的孢粉化石,共鉴定出85属135种或未定种。该井段的孢粉化石以MomipitesQuercoidites含量丰富,始新世常见分子Sabalpolllenites areolatus断续出现,并见有特征分子Schizaeoisporites eocenicus为主要特征,根据孢粉特征分子和优势属种的分布规律,命名为Schizaeoisporites eocenicus-Quercoidites-Momipites-Sabalpollenites areolatus组合;对比相同井段有孔虫和钙质超微化石的分布时代,推测当前的孢粉组合时代为中晚始新世。依据孢粉组合面貌,对照我国油气区古近纪—新近纪孢粉序列的数据统计结果,系统研究后所建立的划分孢粉植物类型、气温带和干湿度带的3个模式,并结合本钻井其他孢型化石分布特征,认为研究区中晚始新世地层为近海陆地环境,北亚热带、暖温带湿润型古气候沉积。

     

  • 图  1  缅甸英雄岛R-3井位置

    据文献[6]修改。

    Figure  1.  Location of well R-3 in Ramree Island, Myanmar

    图  2  缅甸英雄岛R-3井始新世代表性孢粉化石图谱

    Figure  2.  Diagram of representative Eocene sporopollen fossils from well R-3 of Ramree Island, Burma

    图  3  缅甸英雄岛R-3井始新世代表性孢粉化石

    1,9.三孔沟粉未定种Tricolporopollenites sp.(1为2 762~2 764 m,9为2 702~2 704 m);2.古新黄杞粉Engelhardtioidites paleocenicus,2 702~2 704 m;3.小五角粉Pentapollenites minor,2 840~2 844 m;4.三沟粉未定种Tricolpopollenites sp.,2 762~2 764 m;5.三肋脊榆粉Ulmoideipites tricostatus,2 792~2 794 m;6.拟桦粉未定种Betulaceoipollenites sp.,2 792~2 794 m;7.隐现莫米粉Momipites occultatus,2 732~2 734 m;8.褶皱肋桦粉Betulaepollenites plicoides,2 840~2 844 m;10,22.变形桤木粉Alnipollenites metaplasmus(10为2 672~ 2 674 m,22为2 840~2 844 m);11.网面厚沟缘粉Crassimarginpollenites reticulates,2 702~2 704 m;12,26.极环山核桃粉Caryapollenites polarannulus(12为2 702~2 704 m,26为2 702~2 704 m);13.小榆粉Ulmipollenites minor,2 732~2 734 m;14.亚三角形枥粉Carpinipites subtriangulus,2 732~2 734 m;15.三射莫米粉Momipites triradiatus,2 702~2 704 m;16.苗榆粉未定种Ostryoipollenites sp.,2 762~2 764 m;17.莫米粉未定种Momipites sp.,2 582~2 584 m;18.小杨梅粉Myricipites minor,2 582~2 584 m;19.真桤木粉Alnipollenites verus,2 672~ 2 674 m;20,27,29.真胡桃粉Juglanspollenites verus(20为2 702~2 704 m,27为2 702~2 704 m,29为2 792~2 794 m);21.混杂异常桤木粉Paraalnipollenites confusus,2 762~2 764 m;23.三皱痕莫米粉Momipites triletipollenites,2 792~2 794 m;24.穴纹扇巴棕榈粉Sabalpollenites areolatus,2 582~2 584 m;25.锦致柳粉Salixipollenites elegans,2 702~2 704 m;28.粒纹亚三孔粉Subtriporopollenites granulatus,2 822~2 824 m;30.克氏脊榆粉Ulmoideipites krempii,2 672~2 674 m;31.极环莫米粉Momipites polanulatus,2 840~2 844 m;32.条纹江苏粉Jiangsupollis striatus,2 840~2 844 m;33.显明杨梅粉Myricipites conspicus,2 672~2 674 m;34.拟榛莫米粉Momipites coryloides,2 672~2 674 m;35.山核桃粉未定种Caryapollenites sp.,2 642~2 644 m;36.三角山核桃粉Caryapollenites triangulus,2 672~2 674 m;37.三角莫米粉Momipites triangulus,2 672~2 674 m;38.粒纹库盘尼粉Cupanieidites granulatus,2 792~2 794 m;39.伸长木兰粉Magnolipollis elongatus,2 582~2 584 m;40.日耳曼水藓孢Sphagnumsporites germanicus,2 702~2 704 m;41.老水藓孢Sphagnumsporites antiquus,2 762~2 764 m;42.乌斯曼平瘤水龙骨孢Polypodiisporites usmensis,2 822~2 824 m;43.外点单缝孢未定种Extrapunctatosporis sp.,2 792~2 794 m;44.哈氏水龙骨单缝孢Polypodiaceaesporites haardti,2 642~2 644 m;45.安定型罗汉松粉Podocarpidites andiniformis,2 732~2 734 m;46.银杏粉未定种Ginkgoretectina sp.,2 822~2 824 m;47,53,56.雪松粉未定多种Cedripites spp.(47为2 562~2 564 m,53为2 588~2 590 m,56为2 702~2 704 m);48.梭形麻黄粉Ephedripites(Distachyapites)fusiformis,2 732~2 734 m;49,54.双束松粉未定多种Pinuspollenites spp.(49为2 562~2 564 m,54为2 582~2 584 m);50.始新希指蕨孢chizaeoisporites eocenicus,2 642~2 644 m;51.云杉型罗汉松粉Podocarpidites piceiformis,2 702~2 704 m;52.罗汉松粉未定种Podocarpidites sp.,2 732~2 734 m;55.微小铁杉粉Tsugaepollenites minimus,2 702~2 704 m;57.具缘铁杉粉Tsugaepollenites igniculus,2 702~2 704 m。

    Figure  3.  Representative Eocene sporopollen fossils from well R-3 in Ramree Island, Burma

    表  1  缅甸英雄岛R-3井始新世孢粉化石统计

    Table  1.   Statistics of Eocene sporopollen fossils from well R-3 in Ramree Island, Burma

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  • 收稿日期:  2023-04-20
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