平邑盆地下第三系官中段核形石较为发育 ,类型多样。通过对其内部结构的研究发现核形石单元纹层有六种类型 ,作为核心的藻类仅在顶端发生碎屑粘结效应 ,而其底部则发育厚度小 ,规则的暗色纹层。纹层组合类型多样 ,主要受藻类发育程度 ,水动力强度和藻类种属的控制 ,是不同水动力环境下的产物。根据颗粒大小、纹层组合类型、纹层层数、填隙物将核形石分为浅水高能成因核形石和较深水低能成因核形石。核形石成因分析和分类对沉积环境的判别具有重要的指示作用 In the middle part of the Third Department of Pingyi Basin, the nucleolites are more developed and of various types. Through the study of its internal structure, it has been found that there are six types of karyotypes of core-shaped stone units. The core algae only have the effect of chip bonding at the top and the dark, regular dark color layer at the bottom. There are various types of lamina assemblages, which are mainly controlled by the degree of phytoplankton development, hydrodynamic strength and algal species, and are the products of different hydrodynamic environments. According to the particle size, the type of lamina, the number of layers and the interstitial materials, the nuclei are divided into shallow-water high-energy nuclei and deep-water low-energy nuclei. The analysis and classification of the kapok stone have an important directive role in determining the sedimentary environment