松辽盆地晚白垩世古气候变化对层序发育的影响
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摘要
根据松辽盆地上白垩统地层中的孢粉组合及地化资料的分布特征,对其古气候进行恢复。结果表明古气候变化可分为两个干热→温湿→干热的旋回,这一结论与利用岩性、电性及地震等资料解释出的两个二级层序的旋回变化有良好的对应关系。气候的旋回性变化导致湖平面和沉积物供给的变化,进而影响层序的发育。每个旋回内气候的干热→温湿→干热的变化影响层序的低水位体系域、湖侵体系域和高水位体系域的发育,同时也控制着体系域内沉积物的堆积方式及沉积相的分布。
On the study on distributional characteristics of sporopollen assemblage and geochemical data at the late Cre- taceous period in Songliao basin,the paleoclimate was recov- ered.The result indicates that the palaeoclimate change is classified into two cycles.,from xerothermic to humit to xe- rothermic.The cycles above are well corresponding with the cycles of two secondary sequences interpreted from the li- thology,the electrical property and seismic data.The cyclic change of palaeoclimate results in the changes of lacustrine level and sediment supply,consequently affecting the devel- opment of lithologic sequence.The palaeoclimate change of each cycle affects the changes of the low-stand systems tract (LST),transgressive systems and high-stand systems tract (HST),and also controls the accumulation model of deposits and the distribution of sedimentary facies.
On the study on distributional characteristics of sporopollen assemblage and geochemical data at the late Cre- taceous period in Songliao basin,the paleoclimate was recov- ered.The result indicates that the palaeoclimate change is classified into two cycles.,from xerothermic to humit to xe- rothermic.The cycles above are well corresponding with the cycles of two secondary sequences interpreted from the li- thology,the electrical property and seismic data.The cyclic change of palaeoclimate results in the changes of lacustrine level and sediment supply,consequently affecting the devel- opment of lithologic sequence.The palaeoclimate change of each cycle affects the changes of the low-stand systems tract (LST),transgressive systems and high-stand systems tract (HST),and also controls the accumulation model of deposits and the distribution of sedimentary facies.
引文
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2王东坡，刘招君，刘立．松辽盆地演化与海平面升降[M]．北京：地质出版社，1994．114～127
3高瑞祺，赵传本，乔秀云等．松辽盆地白垩纪石油地层孢粉学[M]．北京：地质出版社，1999．300～333
4邓宏文，钱凯．沉积地球化学与环境分析[M]．兰州：甘肃科学技术出版社，1993．10～31
5刘英俊．元素地球化学[M]．北京：科学出版社，1984．6～415
6张世奇，纪友亮．东营凹陷早第三纪古气候变化对层序发育的控制[J]．石油大学学报．1997，22(6)：26～30
7郭了萍，李登伟，彭军等．我国层序地层学研究的发展趋势[J]．河南石油，2005，19(6)：1～5
8王玉林．济阳地区上古生界沉积与层序地层分析[J]．河南石油，2003，17(5)：1～3
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