摘要
在陆相盆地中,基底沉降、沉积物供给和气候控制着基准面变化和层序发育,而气候的变化造成植被的变化,即造成了植被所产生的孢粉组合的变化,层序地层与孢粉组合有着密切的联系。首先根据孢粉母体植物生长的环境来恢复古气候,然后与综合岩性、电性及地震等资料在济阳坳陷古近系划分出的1个一级层序、4个二级层序、10个三级层序相对照。结果表明,利用孢粉组合特征进行层序地层学研究是可行的;牛38井沙三段中连续取芯井段,根据孢粉可以划分出湖侵体系域和湖退体系域2个三级层序,依据主要孢粉属种的变化,进一步划分出17个次级层序,与高精度层序地层对应。在资料丰富的情况下,可以运用孢粉组合变化进行高精度层序地层学分析,以提高区域地层对比的精度。
In continental basins, base level and sequence stratigraphy is controlled by tectonic movement, climate, and sediment supply. Climate is also a major controlling factor on vegetation and palynological as- semblage. Thus, sequence stratigraphy and palynological assemblages may be related. This study focuses on the palynology and sequence stratigraphy of the Paleogene successions in the Jiyang Depression. Paleo- gene climate was reconstructed using palynological data. The palynological data was also correlated with sequence stratigraphic data from one first-order, four second-order, and ten third-order sequences. This study shows that palynological data can be used in sequence stratigraphic division of Paleogene successions in the Jiyang Depression. Using palynological data, we recognized two third-order sequences, as well as their lacustrine transgression and regression system tracts in the Niu 38 Well which penetrates the middle Es3 Member. These two third-order sequences can be further divided into, on the basis of palynological da- ta, 17 parasequences. This study shows that palynological data can assist in achieving high resolution in sequence stratigraphic division and regional correlation.
出处
《地层学杂志》
CSCD
北大核心
2007年第4期407-414,共8页
Journal of Stratigraphy
基金
中石化集团公司科技攻关项目"断陷湖盆碎屑岩储层成岩演化与评介"(P06010)资助
关键词
孢粉
层序地层
古近纪
济阳坳陷
山东
palynology, sequence stratigraphy, Paleogene, Jiyang Depression, Shandong
