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This work proposes a geoscience-tailored fine-tuning solution of SAM2 that combines a hybrid prompt strategy with multi-loss objectives and post-regularization techniques, targeting thin features, class imbalance, and slice-to-slice consistency for practical interpretation workflows. We tackle the problem by fine-tuning SAM2’s image encoder, prompt encoder, and mask decoder using cosine-annealed AdamW with warm restarts, training on synthetic seismic slices with automatically generated yet specifically placed point prompts per facies mask and a calibrated score-regression term.