Abstract：The characteristics and origin of densification of the tight gas reservoirs from the Member 1 of Jurassic Sagonghe Formation,Junggar Basin were investigated through analyses of cores,thin sections and scanning electron microscope images,and well logging data. The results show that: (1)The studied reservoirs can be categorized as typical deep tight sandstone gas reservoirs that show ultra-low porosity and permeability with average burial depth lower than 4500 m. (2)The reservoir sandstones are interpreted to be subaqueous distributary channel sandstones that were formed in a shallow-water deltaic to lacustrine environment. (3)The lithology of the reservoir rocks is dominated by fine- to silty-fine-grained sandstones with high components of lithic grain and ductile lithic grain and low components of cement. (4)The pore space of the reservoir is mainly characterized by a mixture of pore types with middle to fine pores and fine throats. The throats and pores are highly heterogeneous with poor connectivity and percolation. Finally,lithological composition,compaction and cementation are considered to be the main controls of the formation of the studied tight gas reservoirs.
Sun Jing,Wu Aicheng,Wang Ran et al. Characteristics and origin of deep tight sandstone gas reservoirs of the Jurassic Sangonghe Formation, Mosuowan area, Central Depression,Junggar Basin[J]. JOPC, 2017, 19(5): 907-918.
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