钙质夹层分布对油田开发中后期剩余油挖潜具有重要意义。以研究区南海珠江口盆地番禺油田钻井取心、测井资料为基础，根据钙质夹层的岩性、测井曲线、薄片等特征分析，确定了研究区珠江组钙质夹层的成因及识别特征。研究结果表明：番禺油田珠江组以三角洲前缘沉积为主，钙质夹层具有胶结致密、厚度薄、物性差、分布不连续的特征，其形成主要与成岩阶段含钙流体的过饱和沉淀有关。根据发育位置将钙质夹层分为顶钙和层内钙两种类型。顶钙主要受控于层序界面，连续性较强。层内钙受控于沉积微相，连续性较差。层内钙质夹层主要发育在水下分流河道砂体底部、河口坝砂体顶部，其分布范围和规模受控于沉积微相和砂体叠置界面。钙质夹层分布与剩余油挖潜关系密切，较连续发育的钙质夹层为大底水、低油柱、稠油油藏的经济挖潜提供了有利条件。

In order to characterize the distribution of calcareous interlayers and provide a basis for fine tapping of remaining oil in the later stage of oilfield development. Based on the drilling coring and logging data of Panyu oilfield in the Pearl River Mouth Basin of the South China Sea in the study area, and through the analysis of the lithology, logging curves, thin sections and other characteristics of the calcium interlayers, the genesis and identification features of the calcium interlayers in the Pearl River Formation in the study area were determined. It is concluded that the Pearl River Formation in Panyu oilfield is dominated by delta front deposits, and the calcareous interlayer has the characteristics of dense cementation, thin thickness, poor physical properties, and discontinuous distribution. Its formation is mainly related to the supersaturated precipitation of calcium bearing fluid in the diagenetic stage. Calcium interlayers are divided into two types based on their developmental position: apical calcium and intralayer calcium. The top calcium is mainly controlled by sequence boundaries and has strong continuity. The intra layer calcium is controlled by sedimentary microfacies and has poor continuity. Calcareous interlayers mainly develop at the bottom of underwater distributary channel sand bodies and the top of river mouth dam sand bodies, and their distribution range and scale are controlled by the sedimentary microfacies and sand body stacking interface. The distribution of calcareous interlayers is closely related to the potential of remaining oil, and the continuous development of calcareous interlayers provides favorable conditions for the economic potential of large bottom water, low oil column, and heavy oil reservoirs.