Abstract：This study proposes a new prestack seismic inversion method based on orthogonal matching pursuit algorithm to generate the blocky layers with high resolution and provide more advantageous data for geological interpretation. The stra-tegy of the proposed inversion method is to seek the location of reflections firstly, and then re-estimate the value of coefficients at each iteration step. This is an improved version of match pursuit (MP) algorithm called orthogonal match pursuit (OMP) algorithm. This paper adds the regularization term by utilizing the L0 norm to constraint the reflectivity sparsity, and establishes the objective function of prestack inversion based on OMP algorithm. And it is necessary to utilize the model constraint to enhance the stability of inversion. Because of the strong sparsity of the L0 norm constraint, the inversion results will be expressed as blocky or the step stairs. The method is performed in a synthetic example and a field example. In both of them, the proposed orthogonal matching pursuit prestack seismic inversion method works well with credible results compared with the true model and the well log data. The inverted results from the field data are blocky layers with higher resolution.
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