The reservoir characteristics and evaluation of low porosity and permeability sandstone of Member Ⅱ of Shanxi Formation in Daniudi gas field are studied on the basis of research of sedimentary microfacies,microscopic and macroscopic characteristics of reservoirs.It shows that the main components of Member Ⅱ of Shanxi Formation of braided delta are lithic sandstone and lithic quartz sandstone,with compositional maturity of medium level and structural maturity of high level.The porosity and permeability of sandstone range from 2％ to 14.11％ and 0.02× 10-3 μm2 to 3 × 10-3 μm2,with average value of 4.65 ％ and 0.92 × 10-3μm2 respectively.The reservoirs experience diagenesis of mechanical compaction,cementation as well as corrosion.Mechanical compaction,quartz secondary outgrowth and calcite cementation are the main diagenesis of reducing the sandstone porosity,while the intergranular dissolution pore is the major pore type in the rocks.The member Ⅱ of Shanxi Formation can be divided into three types:Type one has relatively high porosity and permeability;type two has moderately porosity and permeability and type three has low porosity and permeability.Accordingly,the criteria of the reservoirs of Member Ⅱ of Shanxi Formation is established and the distribution of different levels of reservoir is characterized.
tight sandstonemember Ⅱ of Shanxi FormationDaniudi gas fieldreservoir characteristicsreservoir evaluation
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