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本文首先从构造、地形、物源及气候等控制因素,比较了湖泊与海洋在沉积条件上的差别,并强调对盆地整体的研究。然后谈到湖泊的分类和微相划分,提出构造成因是以碎屑沉积物为主的淡水湖泊,应以湖水深度和水动力条件,即以洪水期湖面、枯水期湖面和波浪基准面为依据,把湖泊划分成深湖和半深湖、浅湖、滨湖与湖湾等微相。对各微相的岩性组合、层理构造、生物化石……等等特征进行了描述。文章最后提出判断古代湖泊岸线应从地层等厚线、沉积相序、砂体几何形态、特殊岩矿、生物化石、层理构造和颜色,以及地震剖面地震相特征等七个方面来综合确定。
Based on the control factors such as structure, topography, provenance and climate, this paper compares the sedimentary conditions between lakes and oceans and emphasizes the study of the basin as a whole. Then, referring to the classification and microfacies division of lakes, it is proposed that the structural genesis is a freshwater lake dominated by clastic sediments. Based on the lake water depth and hydrodynamic conditions, that is, the lake surface and the lake surface in flood season, The lake is divided into deep and semi-deep lakes, shallow lakes, lakes and lakes and other microfacies. The lithology assemblage, bedding structure, biological fossil of each microfacies and so on are described. Finally, the article puts forward that the judgment of the shoreline of ancient lakes should be determined synthetically from seven aspects such as the isostasis, sedimentary facies sequence, sand body geometry, special rock and mine, biological fossils, bedding structure and color, and seismic facies seismic facies.