摘要： 充分利用岩心、薄片和钻测井等资料,对冀中坳陷饶阳凹陷沙河街组三段致密砂岩储集层的成岩作用、成岩相特征进行了研究。结果表明,沙三段砂岩储集层经历了压实、胶结、溶蚀和破裂等成岩作用,现今正处于中成岩A期。根据成岩作用类型和强度、成岩矿物等将储集层成岩相划分为压实致密、黏土矿物充填、碳酸盐胶结、不稳定组分溶蚀和中等压实弱胶结5种成岩相类型。选取声波时差、自然伽马和电阻率等测井曲线,通过岩心、薄片资料刻度测井曲线,归纳了不同成岩相的测井响应特征,由此建立了各成岩相的测井识别标准,实现了单井纵向上成岩相的识别与划分,探讨了单井纵向上成岩相分布规律。成岩相识别结果与试油结论以及物性分析匹配良好。成岩相的深入分析是致密砂岩储集层甜点预测的重要方法。

关键词: 致密砂岩, 成岩作用, 成岩相, 储集层评价和预测, 饶阳凹陷

Abstract: Based on the observation of bore cores and thin sections, combined with well logging and drilling data,this study documents the characteristics of diagenesis and diagenetic facies of the tight sandstones in the Member 3 of Paleogene Shahejie Formation in Raoyang sag of Jizhong Depression. The sandstones have undergone compaction,cementation,dissolution and fracturing,and they are at the phase A of the intermediate diagenetic stage. Five types of diagenetic facies are recognized on the basis of the type and intensity of diagenesis and diagenetic minerals. They are tightly compacted,clay mineral pore-filling,carbonate cemented,unstable components dissolved and moderately compacted-weakly cemented diagenetic facies. The sonic,gamma ray logs and resistivity,which are sensitive to diagenetic facies,were selected to establish the logging criteria by calibrating cores with logging curves. With the criteria,subdivision and recognition of diagenetic facies were carried out for individual wells,and then the distribution pattern of diagenetic facies in individual wells was figured out. The identified diagenetic facies match with the results of oil testing and petro-physical analysis. A sophisticated approach of diagenetic facies is an important method for predicting sweat spots of tight sand reservoirs.

Key words: tight sandstone, diagenesis, diagenetic facies, reservoir evaluation and prediction, Raoyang sag

中图分类号: 

• P618.130.2+1