Abstract
The inadequate resolution of cavity karst reservoir characterization is a key factor affecting the hydrocarbon production efficiency of ultra-deep marine carbonates. Full waveform inversion (FWI) using high-frequency seismic data can provide a higher resolution than conventional methods. However, computational efficiency limits its application. This paper proposed a target-oriented local FWI method for cavity karst reservoir characterization. Based on the wavefield injection and Marchenko redatuming methods, a local wavefield forward modeling operator is derived. It can obtain the local wavefield corresponding to the physical source at the surface. Based on this local wavefield reconstruction, an objective function of the local FWI is established. To enhance the reservoir boundaries in the inversion results, a stabilizing strategy that combines total variation and minimum support regularization is proposed. A synthetic data test demonstrates that the obtained model can well describe the cavity karst reservoir structures.
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