基于时移地震资料的储层渗透率时变性研究

油田进入高含水开发期后，预测储层渗透率参数是剩余油挖潜的关键。通常渗透率资料通过测井解释获得，然而受油藏开发和储层注水冲刷的影响，开发后期投产井的测井资料无法真实反映油藏原始状态的渗透率情况。利用不同含水阶段时移地震资料，提取并筛选地震属性，优选均方根振幅、反射强度、瞬时频率、振幅包络、主频五种时移地震属性构建数据集，通过偏最小二乘回归模型建立时移地震数据与测井渗透率数据的关系，进而预测中低、高、特高含水开发阶段投产井的渗透率数据，得到全区三期渗透率模型。通过示踪剂资料验证渗透率变化倍数分布，结果表明，井组内渗透率变化趋势与示踪剂资料相吻合。提出的储层渗透率预测方法能够客观反映油藏受注水冲刷影响造成的渗透率变化，为不同开发阶段油藏储层参数预测提供依据。

Study of time-varying reservoir permeability based on time-lapse seismic data

In the high-water-cut development stage,the prediction of reservoir permeability parameters is the key to tapping the potential of remaining oil.The conventional permeability data is obtained by logging interpretation.However,due to the influence of reservoir development and water injection,the logging data of production wells in the late development period cannot truly reflect the permeability of reservoirs in their original state.With the time-lapse seismic data of different water cut stages,seismic attributes are extracted and screened.As a result,five time-lapse seismic attributes are selected for the establishment of a data set,i.e.,rootmean-square amplitude,reflection intensity,instantaneous frequency,amplitude envelope and dominant frequency.The relationship between time-lapse seismic data and logging permeability data is built by apartial least squares regression model,and then the permeability of production wells in low-,high-and ultra-high-water-cut development stages is further predicted,which yields a three-stage permeability model for the whole area.The distribution of permeability change multiples is verified by tracer data.The results show that the permeability change trend in the well group is consistent with tracer data.The established reservoir permeability prediction method can objectively reflect the permeability changes caused by water injection.The new method provides a basis for reservoir parameter prediction in different development stages.