西加盆地 Cardium 组薄砾岩储层水驱可行性分析

Analysis of waterflood feasibility for the thin conglomerate reservoir of Cardium Formation, Western Canada Basin

摘要

为明确西加盆地 Cardium 组 Cardium A 薄砾岩油藏水驱开发潜力，基于岩心观察、压汞及相渗实验、现场注水试验数据和油藏数值模拟等，划分储层类型，分析油藏水驱开发效果。结果表明：西加盆地 Cardium 组 Cardium A 薄砾岩储层类型可划分为I类纯净砾岩和II类含杂质砾岩，油井产能受控于砾岩储层厚度和储层类型；砾岩储层非均质发育、平面岩相相变快，现场注水无法形成连片有效的水驱通道，油井动态响应呈快速水窜型和轻微受效型；水驱开发数值模拟显示温和注水方案的整体增油效果优于强化注水方案的，注水方案相比不注水方案轻微增油，Cardium A 薄砾岩油藏的水驱增油可行性较低。该结果为其他同类型油藏注水开发提供参考。

Abstract

In order to make clear the waterflood development potential of the thin conglomerate reservoir named Cardium A in Cardium Formation of Western Canada Basin, the reservoir type was classified according to the core observation, mercury injection and phase permeability experiments. The waterflood development effect was analyzed based on the data from the field water injection test. The results show that the conglomerate reservoir can be classified into type I pure conglomerate and type II impure conglomerate. The well productivity is controlled by the conglomerate reservoir type and reservoir thickness. The field water injection can hardly form extensive and effective waterflood channels due to the heterogeneity and rapid rock face changes of the conglomerate reservoir. The producer dynamic responses present the type of quick water breakthrough and the type of slight influence. The numerical simulation of waterflood shows that the total oil increase of the gentle water injection scenario is larger than that of the enhanced water injection scenario. The oil increase of water injection scenarios is little compared with that of the scenario without water injection. This research confirms that the waterflood feasibility for Cardium A, the thin conglomerate reservoir, to increase oil production is quite low, which also provides references for water injection development of other similar reservoirs.

关键词

西加盆地 / Cardium 组 / 薄砾岩 / 储层类型 / 产能 / 水驱

Key words

Western Canada Basin / Cardium Formation / thin conglomerate / reservoir type / productivity / waterflood

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基金资助

中国石油化工股份有限公司科技部项目(P19020-1)