塘沽油田沙河街组S_3~5亚段致密储层特征及含油性研究

Characteristics and Oiliness of S_3~5 Sub-member Tight Reservoir of Shahejie Formation in Tanggu Oilfield

通过薄片鉴定、x射线衍射分析、扫描电镜分析、物性分析、压汞数据分析等技术手段,系统剖析了S_3~5亚段致密储层的储集空间类型,探讨了储集空间成因及控制因素。研究区岩心室内分析化验结果证实为弱还原半深水湖相沉积,具有裂缝与基质双重孔隙介质的特点,为新型纳米级非常规碳酸盐储层。分析认为S_3~5亚段致密储层含油性主要受构造、沉积、成岩矿物组分、储集空间类型和异常超压等因素综合影响。

The storage space types of the S3^5 sub-member tight reservoir of Shahejie Formation in Tanggu Oilfield is analyzed and their origin and controlling factors are discussed by means of thin section identification, X-ray diffraction analysis, scanning electron micro- scope analysis, physical property analysis and mercury injection data analysis. The laboratory analysis results of cores show that the tight reservoir is weakly-reductive semi-deep lacustrine deposit, there are two types of storage space：crack and pore in it, and it is a new type of nanometer carbonate reservoir. It is held that the oilness of the S3^5 sub-member tight reservoir is comprehensively controlled by the many factors such as structure, deposit, diagenetic mineral composition, storage space type and abnormal overpressure.