PARTICLE SIZE ANALYSIS ABOUT TIGHT SANDSTONE IN HE 8 MEMBER OF SULIGE GAS FIELD

摘要

With the year-by-year decrease of conventional oil and gas reserves, unconventional reservoirs had become the targetof exploitation in the world wide. Tight gas reservoir, as a kind of unconventional gas reservoir, was abundant in strata, but itsexploitation was difficult. To improve the efficiency of exploitation, rock samples from He 8 member of Suglige, the typical gasfield, were analyzed. Through casting thin sections and electron microscope scanning, typed of sandstone and pore, and particlesize distribution of sandstone samples was obtained. For tight gas reservoir, general method of calculation was insufficient, so thatstandard deviation was employed to get more accurate sorting coefficient. Based on professional statistical analysis of theexperiment data and analysis of particle size in different permeability, particle size distribution chart was obtained. Results,compaction, cementation and dissolution in stratigraphic formation influenced the porosity and permeability of sandstone, andmade the reservoir tight. Results of this research on the Suglige gas reservoir provided theoretical basis for study of dense reservoirpercolation mechanism and guided the actual mining.