2011•Tianranqi diqiu kexueRequires access

Characteristics of Fan Delta in Triassic Karamay Formation,Northwest Margin of Junggar Basin:Taking W16 Well Area As an Example

Jie Zhang

Abstract

The Triassic sedimentary facies of well W16 in northwest margin of Junggar basin are studied by core observation,thin section analysis,and mud logging and well logging data.Results indicate that fan delta front sub-facies is the main sedimentary system of Karamay Formation in W16 well area.The underwater distributary channel deposit and underwater inter-distributary deposit are main sedimentary microfacies in the studied area.The underwater distributary channel deposit is the main reservoir sand.Analyses of the evolution and the distribution of the microfacies in beds suggest that the accumulation of oil and gas is controlled by microfacies,and the underwater distributary channel deposit is the major oil and gas accumulation of Karamay Formation.

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Key concepts: Geology, Facies, Delta, Structural basin, Sedimentary rock, Underwater, Geochemistry, Margin (machine learning)