前积反射的地质解释

Geological interpretation of progradational reflections

前积反射结构是地震剖面上的一种很重要的反射现象。用它可以确定层序和体系域边界，判断水流方向和水动力大小，识别多种沉积环境。本文对前积反射进行了多种分类，探讨了前积与倒积的区别、前积与层序及体系域的关系、假前积的识别等；总结了可出现前积反射的六种沉积环境，即冲积扇、扇三角洲、三角洲、法积员、大陆斜坡、碳酸盐岩台地边缘。

Progradational reflection configuration is a very significant reflection phenomenon in seismic section. It can be used to determine boundaries of depositional sequence and system tracts, current direction, hydraulic energy and manifold depositional environ ments. We discuss the multiclassification of progradational reflections, the difference be tween progradation and lateral accretion,the relation between progradation and sequence or system tract,the identification of false progradation,and so on. Six kinds of sedimen tary environrnent causing progradational reflection are listed,which are alluvial fan,fan delta,delta,turbidite fan, continental slope, and carbonate platform margin.