The development of effective hydrocarbon reservoirs in clastic sedimentary rocks subjected to deep burial conditions is a crucial area of investigation in reservoir research and hydrocarbon exploration. With the continuous development of exploration practices, geological understanding, and engineering technologies, traditional interpretations of deep reservoir formation are continually refined. Current exploration practices have confirmed the existence of effective clastic rock reservoirs at depths ranging from 6000 m to 8000 m. Through a comprehensive review of the literature on deep- buried reservoir formation mechanisms, combined with multi- scale observations of typical deep reservoirs in the four major basins of the central and western regions, the effect of original sedimentation conditions and various diagenetic processes on reservoir formation has been clarified. Our findings show that under deep and ultra- deep conditions, several key factors contribute to the preservation of primary pores and the formation of dissolution pores in clastic rocks. These factors include favorable sedimentary hydrodynamic conditions, multi- stage hydrocarbon charging, overpressure conditions, and the inhibitory effect of low geothermal fields on diagenetic evolution. Late structural transformation can enhance reservoir permeability through the formation of fractures. Therefore, ultra- deep clastic rocks possess significant exploration potential. Favorable zones of reservoir development in clastic rocks, governed by the interplay of sedimentation, diagenesis, and tectonic activity, represent promising exploration targets.