松辽盆地梨树断陷早白垩世微体古生物、沉积环境以及控油意义  

ON THE MICROFOSSIL ASSEMBLAGES,PALEOCLIMATE INDICATOR AND OIL-CONTROLLING SIGNIFICANCE FROM THE LOWER CRETACEOUS STRATA IN THE LISHU DEPRESSION,SONGLIAO BASIN,NE CHINA

作　　者：鄢伟[1] 樊太亮[2] 王宏语[2] 孙阳子 杨帆 魏源 胡晓贤[1] 

机构地区：[1]中国地质大学能源学院,北京100083 [2]中国地质大学海相储层演化与油气富集机理教育部重点实验室,北京100083 [3]中海油深圳分公司研究院,广州510000 [4]中石化华北分公司第一采油厂,甘肃庆阳745000 [5]长庆油田第二采油厂,甘肃庆阳745000

出　　处：《微体古生物学报》2014年第2期175-189,共15页Acta Micropalaeontologica Sinica

基　　金：国家重大专项"重点油气勘探新领域储集层地质与评价"(编号:2011ZX05009-02);国家"973"计划项目(编号:2005CB422103)资助

摘　　要：根据松辽盆地梨树断陷早白垩世地层中孢粉百分含量的纵向变化特征,建立了自下而上各层组的孢粉组合。通过分析孢粉、藻类以及介形类的古环境指示特征,恢复了梨树断陷地层的气温带、古植被、干湿度以及湖水古盐度。沙河子组沉积时期为温暖潮湿的中亚热带气候,古植被为针叶林和灌草丛,湖水为淡水、微咸水;营城组沉积时期为南亚热带气候,古植被为针叶林和灌草丛,湖水同样为淡水、微咸水;到了登娄库组沉积时期,气候变得炎热干旱,为热带气候,古植被为针叶林,湖水则变为半咸水。本文的研究结果可以有效指示地层的划分与对比以及沉积环境的分析。同时,结合盆地发育讨论了古气候变化的控油意义,古气候的变化控制着烃源岩和储层的发育与分布。According to the distribution of the sporopollen components in the Lower Cretaceous strata from the Lishu fault depression of Songliao basin,sporopollen assemblages of each formations from bottom to top are identified. By analyzing the paleoenvironment indicators of sporopollen, algae and ostracods, the ancient vegetation zone, temperature, humidity and salinity are reconstructed in the Lishu depression. In the sedimentary period of the Shahezi Formation, it was a warm and humid subtropical climate, the main vegetation was coniferous forest and grass, and the lake water was fresh or brackish; in the sedimentary period of the Yingcheng Formation, it was a south Asian tropical climate, the vegetation was coniferous forest and grass,and water was also fresh and brackish. In the sedimentary period of the Denglouku Formation, the paleoclimate became hot and dry,which belongs to a tropical environment, the vegetation was coniferous forest, and water was brackish. This study provides a significant subdivision and correlation of stratigraphy, and analysis of sedimentary environment. In addition to the reconstruction of basin development, the paleoclimate change is discussed in this paper which implies their importance in controlling the oil-gas formation and preservation.

关 键 词：孢粉 古气候 沉积环境 控油 梨树断陷 松辽盆地 

分 类 号：P618.13[天文地球—矿床学] P534.53[天文地球—地质学] Q913[生物学—古生物学]