Abstract: The results of scanning electron microscope (SEM) and energy spectrum analyses displayed that there were many potash feldspar corrosion cavities in detrital sandstone reservoir of the lower Cretaceous in Changling Sag and its edge.The potash feldspar content in the south of Songliao Basin has a positive correlation with porosity of reservoir,while the contents of calcite and ankerite have a negative correlation with porosity of reservoir.The correspondence analysis indicates that seven parameters of detrital mineral combination have a strong correlation with porosity of reservoir and a poor correlation with oil saturation and permeability.It is indicated that detrital mineral combination has the obvious controlling effects over the porosity of sandstone reservoir.The multi-element regression analysis can be used to quantitatively express and predict the controlling effect of detrital mineral combination over the porosity of sandstone reservoir.

Key words: sandstone reservoir, detrital mineral combination, porosity, prediction method, Changling Sag

摘要： 扫描电镜和能谱分析发现,在松辽盆地南部长岭凹陷及其周缘的白垩系下统碎屑岩储集层中,钾长石溶蚀孔普遍发育,钾长石碎屑含量与储集层孔隙度呈正相关,而方解石、铁白云石等碳酸盐胶结物含量与储集层孔隙度呈负相关.利用数学地质手段进行的分析结果表明,7项碎屑岩的矿物组分参数均与孔隙度的相关性甚强,而与含油饱和度和渗透率的关系很弱,这说明碎屑岩的矿物组成对储集层孔隙度有明显的控制作用.通过多元回归分析,可以定量表达和预测矿物组分对储集层孔隙度的影响.

关键词: 砂岩储集层, 碎屑矿物组成, 孔隙度, 预测方法, 长岭凹陷