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

The Study of the Sedimentary Microfacies of Single Sand-body in High Water-cut Oilfield:Taking PI Oil Bearing Formation of 2-North of Sabei Development Area as an Example

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。

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, aban-doned channel microfacies, nature levee microfacies, sheet sand microfacies in the sedimentary setting of river-del-ta. 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 microfa-cies, which supplies important geological basis for the prediction of the remaining oil and the adjustment of the de-velopment plan of the oilfield.