松辽盆地晚白垩世古气候变化对层序发育的影响  

Effect of palaeoclimate change at the late Cretaceous period on lithologic sequences in Songliao basin

作　　者：王书宝[1,2] 孙钰[3] 钟建华[1,4] 王国壮[5] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国石化西北油田分公司 [3]中国石化石油勘探开发研究院 [4]中国石油大学(华东)地球资源与信息学院 [5]中国石化胜利油田分公司东辛采油厂

出　　处：《石油地质与工程》2008年第4期29-32,共4页Petroleum Geology and Engineering

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.

关 键 词：松辽盆地 晚白垩世 古气候 孢粉组合 地化资料 层序地层 

分 类 号：TE111.3[石油与天然气工程—油气勘探]