摘要：The rock types of the Upper Paleozoic sandstone gas reservoir in Linxing block in the eastern Ordos Basin are simple,but the petrological characteristics are very complex.The types of diagenesis are complex and diverse,and the impact on the reservoir physical properties is obvious.In order to analyze the petrological characteristics,reservoir physical properties,and sensitivities of the Shihezi Formation and Shanxi Formation in the Linxing Block,scanning electron microscope,X-ray diffractometer,X-ray fluorescence spectrometer,core permeability tester and other experimental equipment are used for the analysis of the samples from Shihezi Formation and Shanxi Formation.Studies have shown that the Shihezi Formation and Shanxi Formation in the Linxing Block are mainly composed of detrital quartz sandstone and detrital sandstone,with high content and many types of debris,mainly plastic metamorphisms such as schist,phyllite,and mudstone.The cuttings,along with the muddy and volcanic interstitial materials,undergo a strong alteration.Sandstone interstitial content is high,mainly calcareous,siliceous,clay and volcanic tuff.The Shihezi Formation and Shanxi Formation are low porosity and low permeability reservoirs.Sandstones in different diagenetic phases have different pore evolution characteristics and sensitivities.The most favorable reservoirs in the Upper Paleozoic were mainly developed on the quartz-enlarged siliceous cemented intergranular pore diagenetic sand bodies of the Shanxi Formation,which are the favorable horizons for future exploration.
