基于数字滤波的低频信息可控约束波阻抗反演
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中图分类号：P631 文献标识码：A DOI：10.13810/j.cnki.issn.1000-7210.20250180
Digital filteringbased impedance inversion with controllable low-frequencyconstraints
Yang Peijie， Xiu Jinlei，Wang Changjiang，Luo Hongmei （Exploration and Development Research Institute of Shengli Oilfield，SINOPEC， Dongying，Shandong 257Ol5，China）
Abstract： Seismic data generally lacks low-frequency information in a range of 0-5Hz ， so how to effectively compensate for such information constitutes a critical step in improving the objective accuracy of seismic inversion.To this end，this paper proposes a digital filtering-based impedance inversion method with controlable lowfrequency constraints.First，an inversion objective function is established to match synthetic seismogram derived from inversion results with seismic data and impose regularization constraints on reflection coefficients. Second，digital filtering is integrated into the objective function.During inversion iterations，low-passfilters are separately appliedtothe broadband geological modeland inversion results by digitalfilter，soas to force the'lowfrequency information of inversion resultstoconform to that of the geological model.Therefore，the modeldriven constraints on inversion results are achieved.Both model test and field application demonstrate that，compared with the existing impedance inversion methods，the proposed method only uses thelow-frequency informationofthe geological model to constrain thelow-frequency information of inversion results without distorting the mid-frequency and high-frequency information.Moreover，by regulating the frequency components of lowfrequency informationvia a digital filter，this method ofers a novel low-frequency constraint strategy for seismic inversion，which efectively enhances the application flexibility of geological models and improves the resolution and accuracy of impedance inversion results.
Keywords： broadband geological model，digital filtering，low-frequency information of geological model，controllablelow-frequency constraint
0 引言
约束在地震反演中具有重要作用，主要有先验约束[1-2]、岩石物理约束[3-4]、地质模型约束[5-11]等。（剩余9309字）