论文部分内容阅读
断陷湖盆中一个完整陆相层序的体系域具四分性，即低水位体系域（ＬＳＴ）、水进体系域（ＴＳＴ）、高水位体系域（ＨＳＴ）及水退体系域（ＲＳＴ），该四分体系域具显著的几何构型特征，它们分别由低位加积小层序组、退积小层序组、高位加积小层序组及进积小层序组构成。陆相层序四分体系域是一个沉积基准面旋回所引起的可容空间旋回性变化的沉积响应。对于断陷湖盆的一个完整陆相层序，其体系域划分原则为：湖相厚层泥岩代表高水位体系域，它是水退体系域和水进体系域的分界；初始湖泛面之上为水进体系域，其下为低水位体系域。断陷湖盆中一个完整的陆相层序自下而上依次由下列层序单元构成；层序界面（ＳＢ）→无湖岸上超的低水位体系域→湖岸显著上超的水进体系域→由沉积速率缓慢的垂向加积型湖相泥质岩构成的高水位体系域→湖岸显著退却的水退体系域→层序界面（ＳＢ）。
The system tract of a complete continental sequence in a fault-depressed lake basin is characterized by fourfolds: LST, TST, HST and RST ), The quaternary system has significant geometric configuration features, which are composed of low-order small-scale sequence group, small-scale sequence group, high-order small-scale sequence group and small-sequence sequence series. The terrestrial sequence tetrad system is a sedimentary response to the cyclostationary change of accommodation space caused by the sedimentary datum cycle. For a complete continental sequence of faulted lacustrine basin, the principle of system tract division is that the lacustrine thick mudstone represents the high watermark system tract, which is the boundary between the water retreat system tract and the water system tract. The initial lake flood surface On the water into the system tract, which is below the low water system tract. A complete continental sequence in a fault-depressed lake basin consists of the following sequence units from the bottom to the top: the sequence boundary (SB) → the low-level system tract overlying the lake bank → the remarkably super-super-lake water system into the system tract → high water level system tract consisting of slow sedimentary lacustrine sedimentary lacustrine facies → marked water retreat system domain → SB of the lake shore.