Sedimentary characteristics and depositional model of slumping deep-water gravity flow deposits:A case study from the middle Member 3 of Paleogene Shahejie Formation in Linnan subsag,Bohai Bay Basin
Cao Yingchang, Wang Sijia, Wang Yanzhong, Yang Tian, Zhang Shaomin, Zhang Huina
School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong
Abstract：Based on drilling cores,logging data,the types,characteristics and model of deep-water gravity flow deposits in the middle Member 3 of Paleogene Shahejie Formation in Linnan subsag were studied according to core observation,thin-section identification and grain size analysis. The research shows that the deep-water gravity flow deposits in the middle Member 3 of Shahejie Formation in Linnan subsag of Bohai Bay Basin are mainly developed of three kinds of sedimentary types: Slumping deposits,debris flow deposits and tubidity current deposits. The convolute bedding,liquefied sandstone vein, small terraced fault and superposition between deformed rock and undeformed rock are the typical characteristics of the slumping deposits. The sandy debris flow deposits are well developed in the research area which can be recognized with the mutant bottom contact surface,massive bedding,spliting muddy clastics,khaki muddy gravels and the mutant or irregular top contact surface. The tubidity current deposits can be recognized with marks of the normal gradings,erosional basal surface,flute casts,thin interbedding of sandstone and mudstone and the incomplete Bouma Sequence. Slumping deposits mainly developed in the root of the delta front slope while sandy debris flow deposits developed in the front of the slump deposits. Debris flow was diluted and transformed to turbidity current gradually during its forward transportation process. The slumping gravity flow deposits can be divided into three parts: Near source deposits,middle deposits and the distal deposits. The near source deposits are mainly composed of slumping deposits with deformation structures and thick massive sandy debris flow deposits. The middle deposits mainly contain sandy debris flow and tubidity current deposits. The distal deposits are dominated by thin bedded turbidite deposits.
Cao Yingchang,Wang Sijia,Wang Yanzhong et al. Sedimentary characteristics and depositional model of slumping deep-water gravity flow deposits:A case study from the middle Member 3 of Paleogene Shahejie Formation in Linnan subsag,Bohai Bay Basin[J]. JOPC, 2017, 19(3): 419-432.
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