南堡凹陷湖相碳酸盐岩优质储层识别及分布预测

Identification and distribution prediction of high-quality reservoir of lacustrine carbonate rocks in Nanpu Sag

张汶

ZHANG Wen

中海石油（中国）有限公司天津分公司，天津 300459

Tianjin Branch of CNOOC Limited, Tianjin 300459, China

南堡凹陷曹妃甸A油田沙一下亚段发育湖相碳酸盐岩储层，常表现出岩性特征复杂、纵横向非均质性强的特征，识别该类储层中的优质储层并预测其分布范围对勘探开发具有重要意义。文中通过岩心、薄片、测井、压汞曲线等资料分析，对研究区各类储层的岩性特征、测井响应特征、孔喉结构及物性特征进行对比分析，其中生物碎屑白云岩发育体腔孔、铸模孔，储层物性、连通性及孔喉结构较好，为研究区的优质储层。同时，根据在等时地层隔架内分析的有利岩相与古地貌、古环境的关系，结合井上岩性组合特征，建立了沙一下亚段碳酸盐岩沉积模式，预测了优质储层的展布形态；再将地质模式与钻井资料相结合，转换为数学模型，定量预测了优质储层的分布范围及变化趋势。

Lacustrine carbonate reservoirs developed in the lower Es1 of Caofeidian A Oilfield in Nanpu Sag, which exhibit the characteristics of complex lithological and high crosswise heterogeneity. Identifying the high-quality reservoir and predicting its distribution range are of great significance. Through the research of core thin sections, logging and intrusive mercury curve, this paper carries out a comparative analysis on lithological characteristics, log response characteristics, pore throat structure and physical properties in various reservoirs of the study area. The results show that dorsal foramen and mould pore developed in bioclastic dolostone. Hence, the bioclastic dolostone has better reservoir property, connectivity and pore throat structure, which is the high-quality reservoir of the study area. And according to the analysis on the relationship between favorable lithofacies and paleoenvironment, combined with the characteristics of lithologic assemblages of each well, this research establishes the sedimentary model of carbonatite in the lower Es1 and predicts the distribution of high-quality reservoir. In addition, this study predicts the distribution range and variation trend of high-quality reservoirs by combining geologic model with drilling data and converting into mathematical models.

10.6056/dkyqt201805007