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摘要:
大庆油田B90井区SⅠ油层组具有较大的油气储量，前人对其沉积微相研究不够精细，制约了进一步勘探开发. 为了提高挖潜效率，采用封闭骨架剖面控制对比的方法开展地层精细划分，构建了由5条横剖面和5条纵剖面组成的横跨全区的封闭骨架剖面，建立SⅠ油层组高频等时地层格架. 基于岩心、测井等资料对5个沉积时间单元沉积微相进行研究. 结果表明：研究区发育窄小孤立型水下分流河道和大面积席状砂沉积，席状砂主要控因是河流作用和波浪改造作用；SⅠ油层组发育三角洲前缘亚相，水下分流河道、席状砂主体、席状砂、席状砂内缘、席状砂外缘等微相；SⅠ油层组沉积时期是一个小幅快速水退到水进的演化序列.
Abstract:The SⅠ oil formation in the B90 well block of Daqing Oilfield has large oil-gas reserves. However, the undetailed previous studies on its sedimentary microfacies restricted further exploration and development. To improve the potential exploitation efficiency, this study uses the closed skeleton profile control correlation method for fine stratigraphic division, constructs the closed skeleton profiles across the whole area with 5 transverse profiles and 5 longitudinal profiles, and establishes the high-frequency isochronous stratigraphic framework of SⅠ oil formation. Besides, the sedimentary microfacies of 5 sedimentary time units are studied based on core and well logging data. The results show that narrow and isolated underwater distributary channels and large area of sheet sand deposits are developed in the area, and the sheet sand is mainly controlled by stream action and wave modification. The delta front subfacies are developed in the SⅠ oil formation, with microfacies such as underwater distributary channel, sheet sand body, sheet sand, inner edge of sheet sand and outer edge of sheet sand. The sedimentary period of the SⅠ oil formation is a small rapid evolutionary sequence from water regression to water transgression.
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Key words:
- sedimentary microfacies /
- Sartu oil formation /
- delta front /
- logging microfacies model /
- Songliao Basin
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