摘要
基于准噶尔盆地车排子地区下白垩统地震、钻井、录井和古生物资料分析,运用高精度层序地层分析方法,结合下白垩统沉积序列和构造演化特征、气候周期性变化特征等,将下白垩统吐谷鲁群划分为4个三级层序,并指出各层序边界在地震、岩性和电性资料上的响应特征。根据车排子地区特定的缓坡斜坡构造背景,建立起无坡折缓坡型层序地层模型,将三级层序划分为湖侵体系域和湖退体系域。湖侵体系域以粗粒扇三角洲前缘和细粒滨浅湖沉积为主,湖退体系域则发育粒度相对较粗的滨浅湖滩坝沉积。研究区沉积演化旋回性特征明显,幕式构造运动和古气候旋回变化对层序的发育起重要的控制作用。
Based on the analysis of seismic data, drilling data, drilling, paleontological data and well-seismic calibra- tion, and combined with the characteristic of sedimentary sequence, tectonic evolution and climate periodic change in Chepaizi area, northwestern margin of Junggar Basin, the lower Cretaceous could be divided into 4 3nl order sequences under the guidance of high-resolution sequence stratigraphy analysis method. A sequence stratigraphic model for de- pression basin without slope break was established according to the gentle slope tectonic setting in Chepaizi area. In this model, the third-order sequence consisted of 2 system tracts, transgressive system tract （TST） and regressive sys- tem tract （RST）. Coarse-grained fan delta front and fine-grained shore-shallow lacustrine was mainly developed in TST, and relatively coarse-grained shore-shallow lacustrine was developed in RST. The cyclicity feature of sediment evolution in the study area was obvious. Both the episodic movement and the ancient climate change of Lower Creta ceous play an important role during the sequence development.
出处
《沉积学报》
CAS
CSCD
北大核心
2013年第6期1070-1080,共11页
Acta Sedimentologica Sinica
关键词
层序地层
主控因素
下白垩统
准噶尔盆地
车排子地区
sequence stratigraphy
controlling factor
Lower Cretaceous
Junggar Basin
Chepaizi area
