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从坡积到湖泊沉积,各类沉积物都有明显的旋回性。沉积旋回既是沉积岩的重要特征,也是地层划分与对比的重要依据。沉积旋回可分三类:海洋旋回、过渡旋回和大陆旋回。海洋旋回厚度大,分布广,层序稳定,在海相地层研究中受到了充分重视。过度旋回含重要煤层,相一旋回法是煤田地质研究的重要方法,研究也较透彻。陆相地层构成我国陆相含油盆地的主体,大陆旋回的一定部位常含重要生、储油层,是石油地质工作者的研究对象,这里仅对此作一初步探讨。
From slope plot to lake sediment, all kinds of sediments have obvious cycle. Sedimentary cycle is not only an important feature of sedimentary rocks, but also an important basis for stratigraphic division and contrast. Sedimentary cycles can be divided into three categories: ocean cycle, transition cycle and continental cycle. The thickness of the oceanic gyration is large, widely distributed, and the sequence is stable. In the study of marine strata, it has received sufficient attention. Over-cycloties contain important coal seams, and the one-cycle method is an important method for coalfield geology research. The terrestrial strata form the main part of the continental oil-bearing basins. Certain parts of the continental gyration often contain important raw and reservoir reservoirs, and are the objects of study for the petroleum geologists. Only a preliminary discussion is made here.