Hydrocarbon potential assessment of the lacustrine fan delta reservoirs in the Lower Cretaceous syn-rift Xing’anling Formation in the Beier Sag, Hailar Basin, Northeast China

Efficient exploration and development of oil gas resources in complex geological environments continue to pose significant challenges for the energy industry. The localization extraction reservoirs basins with structures, developed faults, scattered sedimentary sand bodies are topics international interest. One such basin, Hailar Basin northeastern China, represents a environment heterogeneous distributions reserves, along variable reservoir conditions, leading hydrocarbon extraction. Sudeert field, situated within this is known its high productivity; nevertheless, underlying factors responsible success not yet fully comprehended. Based on seismic, logging, core data from as well previous research, study comprehensively analyzed environment, facies characteristics, body distribution patterns, vertical stacking relationships bodies, accumulation potential Lower Cretaceous Xing’anling Formation field. I II deposited fan-delta front microfacies that conducive include underwater distributary channels, natural levees, estuary dams, silt beds, turbidite sands. Among them, channel main depositional bodies. Three major patterns fan lobes can be identified system: 1) isolated, 2) contact, 3) superimposed lobes. Different combinations different blocks resulted patterns. isolated mainly western oil-producing (B28 block) due scarcity slowly increasing accommodation space. contact central block (B14 sufficient sediment supply steadily space across wide area. southeast (B16 input restricted In whole area, lobe pattern most favorable forms highest-quality because degree connectivity. These results also highlight utility assemblage studies similar rifted basins.