Lithology Identification of Metamorphic Basement Reservoirs in the J Oilfield Using a Linear Discriminant Analysis-Assisted Supervised Self-Organizing Map.

During migmatization, incompatible radioactive elements (e.g., U, Th, and K) preferentially fractionate into the melt phase, resulting in elevated GR values within leucosomes (felsic, light-colored bands). Consequently, a decreasing trend in GR response characterizes the transition from migmatitic granite to migmatitic gneiss.

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