Characteristics and Controlling Factors of Glutenite Reservoir in Permian Lower Urho Formation in the South Slope of the Mahu Sag

doi:10.11885/j.issn.1674-5086.2019.06.12.03

Abstract

Abstract: Good prospects of exploration of the Permian Lower Uhro Formation on the south slope of Mahu Sag in Juggar Basin. Based on the core observation, the casting of the thin sections, SEM, as well as the analysis of reservoir physical properties, the characteristics and controlling factors of Lower Urho Formation have been researched. The results indicate that the type of reservoir rock in the Permian Lower Uhro Formation is mainly debris sandstone with muddy and zeolite cementation, and reservoir has lower maturity of structure and composition. There are various of pores of reservoir space, mainly the residual intergranular pores, volcanic material pores and zeolite pores. Influencing factors on physical properties of reservoirs are sedimentation, diagenesis and tectonism. The reservoir is controlled by sedimentary facies belt. The under-water distributary channel on the leading edge of the fan Delta is the most favorable sedimentary facies belt, followed by the fan Delta plain water diversion channel. The diagenesis is mainly compaction, cementation and dissolution. Average 24.0% pores are reduced by compaction, and the cementation reduction porosity is 4.9%. The dissolution is mainly turbid zeolite dissolution, and secondary pores formed by dissolution improve physical property.

Key words: Juggar Basin, south slope of Mahu Sag, Lower Uhro Formation, reservoir characteristics, main control factors

CLC Number:

TE122

QIAN Haitao, ZHANG Xiang, BIAN Baoli, LIU Hailei, ZHANG Menggang. Characteristics and Controlling Factors of Glutenite Reservoir in Permian Lower Urho Formation in the South Slope of the Mahu Sag[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 41-50.

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