高含水油田沉积微相至单砂体级精细研究——以萨北二区密闭取芯井区PI油层组为例

摘要

According to the analysis of cores and logging data of PI oil-bearing formation of 2-north of Sa-bei development area ,it is held that in the oil-bearing formation is developed distributary channel microfacies, abandoned channel microfacies, nature levee microfacies, sheet sand microfacies in the sedimentary setting of river-delta. The special distribution law of the sandbodies is understood according to the division and correlation of deposi-tional time unit, the establishment of logging sedimentary microfacies model and the study of sedimentary microfacies, which supplies important geological basis for the prediction of the remaining oil and the adjustment of the development plan of the oilfield.%以萨北二区密闭取芯井区为例,通过岩心及测井资料分析,得出研究区PI油层组在河流-三角洲沉积背景下主要发育分流河道、废弃河道、天然堤微相、溢岸薄层砂和席状砂等微相.通过沉积时间单元精细划分、对比、测井微相模式的建立以及沉积微相研究,揭示了单砂体的空间分布规律,为高含水油田剩余油预测、开发调整提供了可靠的地质依据.