Along-Strike Reservoir Development of Steep-Slope Depositional Systems: Case Study from Liushagang Formation in the Weixinan Sag, Beibuwan Basin, South China Sea

Seismic, core, drilling, logging, and thin-section data are considered to analyze the reservoir diversity in east, middle, west fan of Liushagang Formation steep-slope zone Weixinan Sag, Beibuwan Basin. Three factors primarily affect differences for systems: (1) Sedimentary mostly control scales characteristics drainage system microfacies. Massive high-quality reservoirs have shallow burial depths. Channel development sediment supply favor formation these reservoirs. The sedimentary microfacies suggest delta plain distributary channels. (2) Lithofacies types evolution. diagenesis is weak, a weak compaction–cementation diagenetic facies medium compaction–dissolution were developed. (3) Sandstone thickness oil-bearing properties average porosity permeability large, critical sandstone small, capacity high. Furthermore, prediction models summarized as nearshore subaqueous models. model plain, lithology medium–coarse sandstone. organic acid + meteoric freshwater two-stage dissolution developed, various dissolved pores formed, Type I middle fan, medium–fine Only dissolution, pores, I–II Regarding models, large-scale, channel Weak evolution, good physical properties, thick sandstone, developed reservoir. study northern was undertaken order guide predictions. Further, it provides reference distribution system.