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所谓成岩相是指具有特征的成岩组构的岩体。研究成岩相的目的主要是通过对沉积物中不稳定颗粒在不同的成岩条件下的后生变化特征的研究来弄清其成岩环境的变化。本文通过对湖南慈利晚二叠世生物礁成岩特征的研究，从礁相体系中划分出四种基本的成岩相类型：即海底成岩相、混合成岩相、埋藏成岩相和表生成岩相。部分成岩相又可进一步划分出成岩亚相。
The so-called diagenetic phase refers to the rock with characteristic diagenetic fabric. The purpose of studying diagenetic facies is to find out the changes of diagenetic environment through the study of epigenetic changes of unstable particles under different diagenetic conditions. Based on the study of diagenetic diagenesis of the Late Permian bioherm in Cili, Hunan, four basic types of diagenetic facies are distinguished from the reef facies system: seabed diagenetic facies, mixed diagenetic facies, burial diagenetic facies and epithermal facies. Part of the diagenetic facies can be further divided into diagenetic subfacies.