| 突泉盆地下侏罗统红旗组孢粉组合及其古气候意义 |
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| 引用本文：董辛伟,张德军,杨涛,尚竽良,张渝金.2026.突泉盆地下侏罗统红旗组孢粉组合及其古气候意义[J].地球学报,47(3):469-479. |
| DOI：10.3975/cagsb.2025.102021 |
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| 基金项目:本文由东北地区地层古生物地质调查项目(编号: DD20230220)和国家自然科学基金项目(编号: 42293280; 42172024)联合资助。 |
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| 中文摘要:突泉盆地是大兴安岭中段晚古生代基底之上的中生代盆地。为探查盆地内的地层发育和含油气地质情况, 中国地质调查局在盆地内部署实施了TD-1井, 获取了全井段完整的岩心实物资料和油斑、油浸级别的油气显示。然而, 迄今为止, 关于TD-1井含油气层位的地质时代仍缺乏确切的年代地层学和生物地层学证据。本文对TD-1井879.2~890.7 m井段的孢粉进行了分析, 建立了Alisporites-Cyclogranisporites-Piceaepollenites孢粉组合, 该组合的裸子植物花粉占据绝对优势地位, 以松柏类花粉为主, 单沟花粉偶有出现, 蕨类植物孢子次之, 未见被子植物花粉, 且含有一定数量的晚三叠世孑遗分子。通过对该井段的孢粉组分进行分析, 确定了其时代为早侏罗世, 对应地层为红旗组。结合孢粉植被分析, 结果反映了热-温带湿润的气候环境。 |
| 中文关键词:突泉盆地 TD-1井 早侏罗世 晚三叠世 红旗组 孢粉组合 |
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| Sporopollen Assemblage of the Lower Jurassic Hongqi Formation in the Tuquan Basin and Its Paleoclimatic Significance |
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| Abstract:The Tuquan Basin is a Mesozoic basin overlying the Late Paleozoic basement in the middle section of the Daxing’an Mountains. To explore the stratigraphic development and hydrocarbon geology within the basin, the China Geological Survey implemented “Well TD-1” inside the basin, obtaining complete core physical data for the entire well section, as well as oil showings at the oil spot and immersion levels. However, there remains a lack of definite chronostratigraphic and biostratigraphic evidence for the geological age of the hydrocarbon-bearing horizons in Well TD-1. In this study, the sporopollen in the 879.2–890.7 m well section of Well TD-1 was analyzed, and the Alisporites-Cyclogranisporites-Piceaepollenites sporopollen assemblage was established. In this assemblage, gymnosperm pollen was dominant, with coniferous pollen being the main component and monosulcate pollen occasionally appearing. Fern spores were second, and no angiosperm pollen was found. Additionally, a number of Late Triassic relict elements are present in the current assemblage. Through analysis of the sporopollen components in this well section, its age was determined to be Early Jurassic, corresponding to the Hongqi Formation. Combined with sporopollen vegetation analysis, the results reflect a warm-temperate humid climate. |
| keywords:Tuquan Basin well TD-1 Early Jurassic Late Triassic Hongqi Formation sporopollen assemblage |
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