Fig. (3) Photos of calcareous interlayers in cores.a. Normal grading, well Z609-M, 198.8 m. Calcareous conglomerate interlayers are located at the bottom and gradually grade upward into calcareous sandstone; b. Uniform distribution, well Z612-N, 306.8 m. Calcite-cemented conglomerate layer, no significant particle size change; c. Composite gradient of arrangement, well Z6, 596.55m; d. Mixed and disorderly arrangement, well Z610, 416.3 m. Calcareous conglomerate layer containing abundant gravel clasts.