中文摘要：

目前，针对珊瑚礁的钻探勘察工作十分有限，获取完整的珊瑚礁地质信息则更加困难，而开展珊瑚礁的研究对我国海洋资源的开发和利用具有重要意义。结合西沙琛航岛地质调查，应用数字钻孔摄像技术，获得大量第一手地质资料，由于传统的岩体完整性指数（RMDI）法并不完全适用于珊瑚礁岩体的评价，考虑到珊瑚礁岩体的孔洞尺寸效应，提出珊瑚礁孔密度的概念，并建立孔密度函数和块度函数，从而改变传统RMDI法中的？值，重新构建珊瑚礁岩体完整性密度函数（DIDF），最终确定珊瑚礁 RMDI 值，对珊瑚礁岩体的完整性进行评价，并应用于南海西沙群岛琛航岛数字钻孔摄像工程地质勘测中CK1孔的完整性评价，与其他评价结果一致，结果表明：高精度的钻孔图像能为珊瑚礁岩体完整性评价提供可靠的结果；孔密度函数能反映钻孔壁孔洞对珊瑚礁岩体影响程度的轴向分布状况；DIDF能反映钻孔孔壁珊瑚礁岩体完整程度的轴向分布状况；RMDI法用于评价珊瑚礁岩体完整性是可行的，能实现全孔或局部孔段的珊瑚礁岩体完整性评价。

英文摘要：

At present, relatively few drilling surveys have been conducted on coral reefs, and comprehensive geological info on coral reefs is difficult to obtain. However, research on coral reef is of great importance to our development and exploitation of maritime resources. The survey of Chenhang Island in Paracell（Xisha） Islands saw China’s first usage of digital borehole camera technology, which resulted in a large amount of first-hand geological data, but the traditional rock mass integrity index （RMDI） method is not suitable for coral reef rock mass. To evaluate the size effect of cavities on coral reef rock mass, we proposed the concept of coral reef cavity density, and established the coral reef cavity density and block functions. Afterwards, the value of coefficient？in the RMDI can be determined;the integrity index density function （DIDF） can be reconstructed;and then ultimately the coral reef RMDI can be determined and used to evaluate the coral reef rock mass integrity. The evaluation method is applied to the borehole CK1 of Chenhang Island in ParacellIslands. The evaluation results are generally consistent with other evaluation methods. Some conclusions are drawn as follows. High-resolution borehole images can provide reliable results for evaluation of coral reef rock mass integrity. The cavity density function can reflect the distribution of cavity effects on coral reef rock mass along the axial direction;DIDF is a good representation of coral reef rock mass integrity along the axial direction; The RMDI method is a feasible approach for the evaluation of coral reef rock mass integrity along the full or partial depth of a borehole.