Research on Low Porosity and Permeability of Sandstone Oil and Gas Reservoir Performance——Take Ta River Southwest of Tarim Basin as the Example

Through a deep study on the low porosity and the low permeability of clasolite reservoir diagenesis and the evolution of blowhole in the reservoir space、the capillary pressure、the feature of blowhole and the cut-off physical property in the low permeability of clasolite reservoir,the oil and gas storage performance is affected easily by the diagenesis and the rocks fundamental fabric of the low porosity and the low permeability of the sandstone reservoir in the Silurian System of the southwestern Ta River in the Tarim Basin.There is certain difference between the porosity structure feature of the reservoir and the reservoir performance.And it may affect the effective reservoir performance.It is determinate that the values of physical properties low limit the reservoir by the relationship between the porosity,the permeability of the core analysis and the saturation,the effective permeability of the oily core.The cut-off value of physical properties in the reservoir:the cut-off value of porosity is 6%;the cut-off value of permeability is 1×10-3μm2;the cut-off value of permeability is 10×10-3μm2.