前言从宏观上看,许多沉积层序都呈楔形。楔子的厚端,由陆源碎屑沉积物构成,而薄的一端,则由碳酸盐沉积物构成。碳酸盐沉积物相对来说不厚,但也不是特别薄。以往的研究,只集中在楔形的两端,很少涉及楔形的中段(即页岩部分)。关于页岩,我们认为它不是由于碳酸盐的外延造成,就是由碎屑岩的外延造成,很少把它看成是一个完整的沉积层。 Foreword From the macroscopic point of view, many sedimentary sequences are wedge-shaped. The thick end of the wedge, which consists of terrigenous clastic sediments, while the thin end consists of carbonate sediments. Carbonate deposits are relatively small, but not particularly thin. Previous studies have focused on both ends of the wedge, rarely involving the middle section of the wedge (ie, the shale section). With regard to shale, we do not consider it to be due to the extension of carbonates or to the detrital evolution of clastics; seldom consider it as a complete sediment.