河湖沉积体系层序地层学研究

河湖沉积体系层序发育的直接因素是地层基准面的变化，在其不同部位基准面变化的影响因素存在差异，地层接触关系，河道砂体的叠置方式，冲积下切作用以及古土壤面可以用来识别层序边界；河湖沉积准层序的划分基础是短期地层基准面的变化，其识别标志包括岩性特征，测井曲线特征及其内部构成特征，准层序有3种类型，即基准面上升准层序，基准面下降准层序和复合型准层序，它们在准层序的演化过程中呈现规律性变化。

Sequence Stratigraphic Study of Fluviolacustrine Sedimentary System

The direct cause of fluviolacustrine sedimentary system growth is the change of base level, where there exist differences of influence factors of base level changes at different positions.Sequence boundary could be recognized with stratigraphyic contact relationship, the patterns of superimposed channel sandbodies, the alluvial incision and paleosoil. The classification of the fluviolacustrine sedimentary parasequence is based on short term base level changes , for which the identification includes the properties of lithology, logging plots and its internal structure. The parasequence is composed of 3 types, such as the base level raising,falling and composite parasequences, regular changes appear during the evolution of parasequence.