杏六区东部单砂体级沉积微相精细研究

Fine study of sedimentary microfacies of single sand in eastern part Xing 6 Area

随着油田主力产层经过多年开采进入特高含水开采时期之后,对地下油气藏的研究精细程度和认识水平在剩余油的精准预测并高效挖潜上起到决定性的作用。对同一沉积时间单元内沉积微相的平面分布特征和单砂体空间展布特征进行精细研究,为油田后期开发方案的调整提供可靠参考依据。结合岩心、测井等资料,对大庆油田杏六区东部葡萄花油层组PⅠ1—PⅠ3小层9个重点沉积时间单元530口开发井储层岩石类型、构造特征进行了研究,不仅掌握了储层发育的岩相特征,而且明确了当时的沉积环境。在沉积时间单元进行精细化分并统层对比的基础上,建立了沉积微相模式,明确了各单元沉积微相在平面上及单砂体在空间上的发育规律。

After years of mining,the main producing stratum of the oilfield has entered the period of extra high water-cut stage,the fine research on the underground oil and gas reservoirs,the fine degree and the level of understanding,to a large extent,play a decisive role in the accurate prediction of the remaining oil and high potential tapping.By combining the data of core,logging and so on,9 important sedimentary time units of PⅠ1-PⅠ3 sublayer of Putaohua oil-bearing layer of 530 development wells,the types of reservoir rocks and the structural characteristics of Putaohua oil reservoir in the eastern part of Xing 6 Area of Daqing Oilfield were studied.Not only the lithofacies characteristics of reservoir development were mastered,moreover,the sedimentary environment at that time has been defined.On the basis of stratigraphic subdivision and fine correlation in sedimentary time units,the logging microfacies facies model has been established,the spatial evolution of the microfacies of each unit and the distribution of the single sand-body was defined.