微量元素示踪监测技术在火烧山油田H3油藏的应用
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摘要
火烧山油田H3油藏为低渗裂缝性砂岩油藏,受裂缝和储层非均质性的双重影响,在注水开发过程中,流体的渗流规律愈来愈复杂,油水井的注采关系难以判断。为了更好的认识该油藏的水驱规律,在该油藏北部优选了5个井组开展微量元素井间示踪监测。根据监测结果分析,注采对应的一线油井仅有一半左右能够受到相应注水井的注水控制,且油井多为单层、单向受效;注采井间注入水主流通道以裂缝为主,波及系数小;油层平面及层内非均质矛盾中等偏强,H_3~3、H_3~2小层的层内非均质程度整体上要大于H_3~1小层;监测区域北部、东北部的显裂缝发育区剩余油饱和度较高,分布集中,形成明显的剩余油富集。
The H3 layer in the Huo Shaoshan oilfield is fractured low permeable sandstone reservoir. Because of the dual effects of fractures and reservoir heterogeneity, percolation pattern of fluids gets more and more complex during water flooding, and the injection-production relation of oil and water wells is difficult to determine. In order to understand the law of water flooding reservoir better,five well groups were selected to carry out microelement interwell tracer monitoring in the north of the reservoir. According to analysis of the monitoring results, only about half of the injection-production corresponding one line oil wells can be appropriately controlled by injection wells, and production wells are mainly single direction response per layer.The mainstream channels of injection-production wells are fractures, so the sweep efficiency is small. The reservoir plane and layer have medium to strong heterogeneity contradictions. Intraformational heterogeneity degrees of the whole H33 and H32 single layers are higher than the H31 single layers. Monitoring area with fractures developed in north and northeast area have high residual oil saturation, which are centralized distribution, therefore,forming areas with rich remaining oil reserves.
The H3 layer in the Huo Shaoshan oilfield is fractured low permeable sandstone reservoir. Because of the dual effects of fractures and reservoir heterogeneity, percolation pattern of fluids gets more and more complex during water flooding, and the injection-production relation of oil and water wells is difficult to determine. In order to understand the law of water flooding reservoir better,five well groups were selected to carry out microelement interwell tracer monitoring in the north of the reservoir. According to analysis of the monitoring results, only about half of the injection-production corresponding one line oil wells can be appropriately controlled by injection wells, and production wells are mainly single direction response per layer.The mainstream channels of injection-production wells are fractures, so the sweep efficiency is small. The reservoir plane and layer have medium to strong heterogeneity contradictions. Intraformational heterogeneity degrees of the whole H33 and H32 single layers are higher than the H31 single layers. Monitoring area with fractures developed in north and northeast area have high residual oil saturation, which are centralized distribution, therefore,forming areas with rich remaining oil reserves.
引文
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