基于E油田A1井组不同示踪剂定量解释方法的综合研究

Comprehensive study based on different tracer quantitative interpretation methods of pattern A1 in E oilfield

为了解南海E油田A1井组的注水连通情况及井间水窜通道的相关参数,优选出水溶性有机微量示踪剂MT-Q1,对该井进行了为期300d的井间示踪剂监测。分析了监测油井产出水中的示踪剂浓度,综合采用数值模拟法、半解析法以及停留时间分布分析法对示踪剂监测结果进行解释。结果表明,数值模拟法耗时18d,计算得出该井组水窜通道渗透率为1000~1500mD,井间水窜通道总体积为34276m^(3);示踪剂半解析法耗时3d,计算得出该井组水窜通道渗透率为612~950mD,孔喉半径为4.4~5.5μm,井间水窜通道总体积为39450m^(3),注采井间水窜通道类型均为高渗层;停留时间分布分析法耗时1d,计算得出该井组平均停留时间为185~272d,洛伦兹系数为0.16~0.28,井间波及总体积为45632m^(3)。综合得出,数值模拟法用时过长,主要作为油藏模型调整更新的辅助手段,矿场应用较少;半解析法用时较短,可获取渗透率、厚度、孔喉半径等多种水窜通道参数,是国内常用示踪剂解释方法;停留时间分布分析法准备数据少、操作简便、实时更新,可获取储层非均质性及波及体积等参数,解释效率高,可作为半解析法的补充手段联用。

To understand the inter-well dynamic connectivity and water channel parameters of pattern A1,E oilfield,tracer element organic tracer MT-Q1 was selected to implement IWTT(inter-well tracer test)on this pattern for an interval of 300 days.The concentration of tracer in adjacent producers were analyzed,and used numerical simulation method,semi-analytical method and residence time distribution analysis method to interpret the tracer monitoring results comprehensively.Results showed that the numerical simulation method took 18 days,calculated permeability of the water channel in this well group was 1000~1500mD,the total volume of water channel was 34276m^(3).Semi-analytical method took 3 days,calculated permeability of the water channel in this well group was 612~950mD,the pore-throat radius of the water channel was 4.4~5.5μm,the total volume of water channel was 39450m^(3),the types of water channels were all high permeability layers.The residence time distribution method took 1 days,calculated the MRT(mean residence time)was 185~272 days,the lc(Lorentz coefficient)was 0.16~0.28,the total volume of water channel was 45632m^(3).Analysis showed that the numerical simulation method takes too long,mainly used as an auxiliary means for adjusting and updating reservoir models,less application in mines.The semi-analytical method took a shorter time and can obtain various water channel parameters such as permeability,thickness,and pore throat radius.It was a commonly used tracer interpretation method in China.The residence time distribution analysis method requires less data preparation,easy to operate,and can be updated in real-time.It can obtain parameters such as reservoir heterogeneity and swept volume,and has high interpretation efficiency.It can be used as a supplementary tool for semi-analytical methods.