Sedimentary characteristics of braided channel reservoirs of Guantao Formation in Laizhouwan Sag
The braided channel deposits of Neogene Guantao Formation has good reservoir performance and are important reservoirs in Bohai Bay Sag.Scholars at home and abroad have done a lot of research on the typical braided channel sedimentary model and reservoir characteristics,but there are few studies on the a-typical braided channel sedimentary characteristics of sand and mud stone with different thickness.Accord-ing to the sedimentary characteristics and reservoir distribution of the braided channel in Guantao Formation,Laizhouwan Sag,southern Bohai Bay Basin,the studies on core observation,thin section identification,well logging analysis,mercury injection testing are carried out.Based on the study of sedimentary models and seismic techniques,the planar distribution of sandy bodies in braided midstream bars is analyzed.The research shows that:(1)Guantao Formation in the study area developed distal sandy braided channel de-posits.(2)Reservoir types mainly include two types:channel bar and braided channel.The channel bar reservoir is a high-quality reservoir with coarse grain size,large thickness,and good physical properties,characterized by high resistivity,high porosity and permeability,high oil saturation,and low shale content.(3)Combined with seismic attribute research,the channel bar reservoir has a wide plane distribution range and is an advantageous area for development.The results can provide a good reference for distal sandy brai-ded channel reservoir evaluation,the deployment of development well location and remaining oil distribution.
braided river depositschannel barbraided channelsedimentary modelreservoir evaluation
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