基于恒速压汞技术的特低-超低渗砂岩储层微观孔喉特征研究

Study of Microscopic Pore Throat Characteristics of Extra-ultra Low Permeability Sandstone Reservoir Based on Constant-rate Mercury Penetration Technique

应用恒速压汞技术对苏里格气田西区盒8段特低、超低渗砂岩储层的微观孔喉特征进行了研究。该类储层孔隙半径分布范围变化不大,对储层渗透率影响不明显,储层渗透率主要受控于喉道半径的大小以及孔隙与喉道的配置关系;毛细管压力曲线揭示出在不同的开发阶段,孔隙和喉道对开发效果的影响程度不同,处于开发中后期的特低、超低渗砂岩储层,注重对于喉道的开发至关重要。

With the constant-rate mercury penetration technique,microscopic pore throat characteristics of extra-ultra low permeability sandstone reservoir of the 8^(th) member of Shihezi Formation in the western Sulige Gas-field are analyzed .Research shows that the influence of pore radius on permeability is not obvious,its change range is not big,and the size of throat radius and pore throat configuration are the determinative factors to control the permeability.The capillary pressure curve reveals that each period is affected by pore and throat in different extents.Throat should be focused on in the extra-ultra low permeability sandstone reservoir duing the minddle and late stages of development.