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This study discusses the formation mechanisms of the delta front reservoir of K1q4 of the Quantou Formation in the central region of the Fuyu oil field and summarizes the types of deposition based on an analysis of facies markers and a comprehensive study of the sedimentary microfacies using well cores, logs, and geologic data. The results show that K1q4 of the Quantou Formation mainly formed through shallow-water sedimentation on a delta front and includes five sedimentary microfacies: underwater distributary channels, underwater natural levees, underwater diversion bays, river mouth bars, and distal bars. Due to the effects of allocyclicity, the composite sand body evolved by vertical overlaying, whereas because of the effects of autocyclicity, the composite sand body evolved by horizontal transport. Three main types of composite sand bodies are located in the study area, including composite underwater distributary channels without levees, composite underwater distributary channels with natural levees, and composites of underwater river mouth bars with distributary channels.

Origin and classification of the composite sand bodies of the delta front in K1q4 of the Quantou Formation in the central region of the Fuyu oil field