Micro Pore Structure Characteristics Of Tight Sandstone Reservoirs

This quantitative research of micro pore structure characteristics of the tight sandstone reservoirs is based on the reservoirs with permeability of less than 5×10^-3?m² in Shengli Oilfield,combined with the capillary pressure curve analysis and pore structure comparative analysis,in view of the tight reservoirs with similar air permeability but existing different complexities in water flooding process.The study results show that the key of understanding the tight sandstone pore structures in Shengli Oilfield is the characterization of pore throat size and distribution,and the effectiveness of the throat radius.With the permeability decreasing,the proportion of those throats greater than 1.0?m in radius is declining rapidly,while that of throats less than or equal to 0.4?m is quickly increasing,which indicate that the throats of tight sandstone reservoirs in Shengli Oilfield are too tiny and like to peak shape in distribution,compared to Daqing Oilfield and Changqing Oilfield,so such a case in Shengli Oilfield will be unfavorable to reservoir development.