论文部分内容阅读
以泌阳断陷双河－赵四地区下第三系核三上段陆相层序地层学研究为例，建立了断陆湖盆陡坡带陆相层序地层学模式：①陆相层序及其体系域界面模式；②体系域模式；③陆相层序地层模式。其中，陆相层序地层模式包括岩相格架模式及年代框架模式两个内容。研究结果显示，断陷湖盆陡坡带可识别出Ⅰ型和Ⅱ型两类陆相层序；一个完整的Ⅰ型陆相层序从下往上发育ＬＳＴ、ＴＳＴ、ＨＳＴ及ＲＳＴ四个体系域，共五个界面，除顶、底界面归属层序界面之外，其它三个界面皆为体系域界面；而Ⅱ型陆相层序缺失ＬＳＴ。无论何种体系域，其沉积体的几何形状均为模状体，且各体系域的沉积相横向配置呈现规律性变化。陆相层序地层等时框架模式清晰地显示了研究区下第三系核三上段的沉积充填史及其沉积层序时空展布特征。
Taking the terrestrial sequence stratigraphy of the upper third member of the Shuanghe-Sanzhao area in the Biyang fault depression as an example, the terrestrial sequence stratigraphic model of the steep slope zone in the Huanghu Lake basin was established as follows: ①The continental sequence and its System domain interface mode; ② system domain model; ③ terrestrial sequence stratigraphic model. Among them, the terrestrial sequence stratigraphic model includes two phases: the lithofacies grid model and the age framework model. The results show that there are two types of continental sequences, type I and type II, in the steep slope of the fault depression lake basin. A complete type I terrestrial sequence develops four system domains of LST, TST, HST and RST from the bottom up , A total of five interfaces, in addition to the top and bottom interfaces belong to the sequence interface, the other three interfaces are the system domain interface; and type II terrestrial sequence missing LST. No matter what kind of system domain, the geometry of the sedimentary body is a mold body, and the sedimentary facies of each system tract shows a regular change in the lateral configuration. The isochronal framework model of terrestrial sequence stratigraphy clearly shows the sedimentary filling history and the spatial-temporal distribution of sedimentary sequences in the upper third member of the Lower Tertiary in the study area.