酒泉盆地第三纪孢粉组合及其古环境探讨

THE TERTIARY SPOROPOLLEN ASSEMBLAGE IN THE JIUQUAN BASIN AND THE PALAEOENVIRONMENT

马瑾乾

Ma Jinqian

玉门石油管理局研究院 735200

Research Institute of Yumen Bureau of Petroleum Supervision

孢粉是母体植物的生殖细胞。因此,利用孢粉谱能够部分或近似地恢复古植被与古气候。本文利用孢粉组合图式代替孢粉谱,探讨了酒泉盆地第三系各岩组的孢粉组合特征,用孢粉组合及植物的生态习性推测了各沉积时期的古植被、古气候分布特征,又用孢粉分异度的变化探讨了各岩组的古环境变化,从而揭示了孢粉植被与古环境之间的内在联系,为油气勘探和研究提供了依据。

As sporopollen is the generative cell of maternal plants, a paleo-vegetation and paleo-climate may be partially and approximately revealed by using the sporopollen spectrum. However, the characteristics of sporopollen assemblages from various Tertialry sequences in the Jiuquan Basin are approached with an alternative method to substitute a sporopollen spectrum by a sporopollen assemblage pattern. The distributive characteristics of paleo-vegetations and paleo-climates during different stages of sedimentation are inferred by sporopollen assemblage and ecologic behaviour of plants, and sporopollen differentiation index are applied to analyse the changes in the pateoenvironments for various sequences. Thus the paper has revealed an internal relationship between sporopollen vegetation and paleoenvironment, which can provide scientific basis for petroleum exploration and research.

https://doi.org/10.11781/sysydz199304423