B1块精细地质模型建立与剩余油分布研究

Establishment of Fine Geological Model for Block B1 and Study on Remaining Oil Distribution

摘要: B1块受长期开采的影响，剩余油高度分散、零碎，层间、平面和层内剩余油分布研究不充分，潜力认识不清，影响后续开发措施的调整效果。为提高研究区油藏开发效果，对B1块开展精细油藏地质研究，在建立精细地质模型的基础上进行数值模拟，认识到，B1块剩余油以次流线区域井间未动用剩余油和构造高部位剩余油为主，厚层上部剩余油饱和度普遍高于下部，上部采出程度比下部低4%~8%。主力厚层上部剩余油富集。开发上需摒弃笼统厚层开发思路，坚持上部富集区精准施策、下部强水区控水稳油的差异化技术体系，通过靶向上部布井、分层注采调控、差异化三采适配，实现层内顶部难采剩余油高效挖潜。

Abstract: Due to long-term mining, the remaining oil in Block B1 is highly dispersed and fragmented, with insufficient research on the distribution of remaining oil between layers, planes, and within layers. The potential is unclear, which affects the adjustment effect of subsequent development measures. In order to improve the development effect of oil reservoirs in the research area, a detailed geological study of the B1 block was conducted. Based on the establishment of a detailed geological model, numerical simulations were carried out. It was recognized that the remaining oil in the B1 block is mainly composed of unused remaining oil between wells in the secondary flow line area and remaining oil in the high part of the structure. The remaining oil saturation in the upper part of the thick layer is generally higher than that in the lower part, and the recovery degree in the upper part is 4%~8% lower than that in the lower part. The remaining oil in the upper part of the main thick layer is enriched. In development, it is essential to abandon the generalized and thick-layered approach, adhering instead to a differentiated technical system that employs precise measures in the upper enriched zone and controls water while stabilizing oil production in the lower high-water zone. By targeting well placement in the upper section, implementing stratified injection-production regulation, and adopting tailored three-phase recovery methods, the efficient extraction of difficult-to-recover remaining oil in the upper part of the formation can be achieved.