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为定量表征裂缝性特低渗油藏井间复杂的裂缝信息,通过分析该类油藏水驱开发特征,将井间复杂的裂缝系统等效为均匀分布的抛物型裂缝条带,通过裂缝条带的流管束等效,建立了裂缝性特低渗透油藏示踪剂监测等效抛物型解释模型,并分析了模型中主要参数的敏感性及不同裂缝参数组合模式下的示踪剂响应曲线特征;以定波及有效裂缝体积和示踪剂曲线形态模式为约束条件,利用遗传算法建立了模型示踪剂曲线自动拟合方法,并通过矿场应用实例验证了模型的合理性和准确性。研究成果可为裂缝性特低渗透油藏水窜水淹井逐级调控实时监测、方案优化调整及效果评价提供重要依据。
In order to quantitatively characterize the complicated fractures information of fractured extra-low permeability reservoirs, by analyzing the characteristics of water flooding in such reservoirs, the complicated fracturing system between wells is equivalent to a uniformly distributed parabolic fractured strip. The equivalent parabolic flow tube bundle is used to establish an equivalent parabolic interpretation model for the monitoring of tracer in fractured ultra-low permeability reservoirs. The sensitivity of the main parameters in the model and the tracer response curve under different combinations of fracture parameters are analyzed The paper established the automatic fitting method of model tracer curves by using genetic algorithm, and verified the rationality and accuracy of the model through the example of mine application. The research results can provide an important basis for the step-by-step real-time monitoring of water-flooded wells in fractured ultra-low permeability reservoirs, optimization and adjustment of programs and evaluation of results.