In September 2022,the Well Dongba-1,deployed by PetroChina Southwest Oil&Gas Field Company on the north slope of the central Sichuan paleo-uplift(Penglai gas area),achieved a significant exploration breakthrough in the Longwangmiao Formation of Lower Cambrian.The breakthrough conform the multi-layers three-dimensional natural gas accumulation in ultra deep and ancient marine carbonate rocks of Upper Sinian-Lower Cambrian in the north slope of central Sichuan paleo-uplift.First,this article analyzes the sedimentary facies,lithofacies,and reservoirs of multiple gas-bearing layers of Upper Sinian-Lower Cambrian in Penglai gas area.Then,starting from three aspects:source rock and source reservoir configuration,sedimentary facies and diagenesis,multi-layers gas bearing characteristics and traps,the favorable conditions for multi-layers gas bearing in the slope area are dissected,and a three-dimensional reservoir formation model is established.The results indicate the widely distributed thick and high-quality source rock such as the mud shale of the Dengying Member 3 and the black shale of Qiongzhusi Formation,provides a good material guarantee for multi-layers natural gas accumulation.The source-reservoir assemblages of upper generation-lower storage and side generation-side storage ensures the efficient filling of natural gas into the reservoir.The Sinian Dengying Formation is influenced by multiple cycles of Tongwan movement and sea level's rising and falling,and thick stacked mound-shoals are developed.The Cambrian Canglangpu Formation and Longwangmiao Formation are controlled by paleogeomorphology to develop high-energy granular shoals of dolomitization.The mound-shoals and high-energy granular shoals form the material basis for reservoir formation,and the widely developed karst process in the later stage further improves the physical conditions of the reservoir,directly controlling the formation and distribution of high-quality reservoirs.Locally developed small-scale structural traps,together with lithological traps and structural-lithological composite traps in the slope background,control the multi-layers gas bearing.Exploration practice has shown that the Sichuan Basin is rich in ultra-deep oil and gas resources.Continuously deepening the understanding of ultra-deep reservoir formation and geological theory,emphasizing the simultaneous advancement and mutual promotion of geological theory and engineering technology,and continuing to advance towards the 10 000 meter's ultra-deep layer will inevitably open up new fields of high-quality scale reserve and production.