天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 13931402.doi: 10.11764/j.issn.1672-1926.2021.04.003
苟迎春1,2(),张小军1,2,李延丽1,张世铭1,2,秦九妹3,吴梁宇1,2
Yingchun GOU1,2(),Xiaojun ZHANG1,2,Yanli LI1,Shiming ZHANG1,2,Jiumei QIN3,Liangyu WU1,2
摘要:
碳酸盐胶结物是酒西盆地石油沟油田古近系白杨河群间泉子组(N1b1)M油组砂岩储层中最重要的自生矿物,其含量及分布是储层定量评价的主要参数。通过矿物学、岩石学和地球化学测试分析认为,该区碳酸盐胶结物主要以方解石为主,少量白云石胶结物,胶结物分布范围为2.11%~56.39%,平均为12.93%。碳酸盐胶结物以基底式、孔隙式结构为主,部分斑点状、环边状。研究表明,不同微相砂体中碳酸盐胶结物相对含量明显不同,其中沙坝微相含量最高,平均为14.6%,河心滩微相含量最低,平均为8.09%,而滞留沉积微相含量居中,平均为7.73%。碳、氧稳定同位素分析表明,δ18O(PDB)值为-11.14‰~-3.25‰,δ13C(PDB)值为-7.32‰~-0.42‰,显示了该区碳酸盐胶结物来自淡水—微咸水环境,与溶解—沉积作用相关。δ13C、δ18O 值呈现由深部到浅部逐渐变小、变轻的趋势,说明由深到浅大气淡水影响逐渐增强,水体盐度减小,成岩温度逐渐增高。研究还发现,碳酸盐胶结物δ18O、δ13C值的分异与油气富集程度具较好的分区性,油浸—含油级砂岩碳酸盐胶结物富集δ13C,油斑—油迹级砂岩缺少δ18O同位素,荧光级砂岩胶结物同时缺少δ18O和δ13C同位素。
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