海拉尔盆地属典型近物源快速堆积断陷盆地,其砂泥岩储层在总孔隙中除可动流体孔隙、黏土水孔隙外还发育大量微毛细管孔隙,其孔隙结构极为复杂,准确确定束缚水饱和度成为难题。介绍利用核磁共振测井10个不同T2谱组分(除1~4 ms外)与常规测井tФ及ФN-ФD资料相结合,从这10个组分中提取3个或5个特征参数综合分析研究,认为对复杂孔隙结构砂泥岩储层直接用10个组分确定束缚水饱和度效果更好。该方法是结合海拉尔盆地地质特点及核磁共振测井资料的实际对T2谱系数法确定束缚水饱和度方法的发展,省去了用大量岩心资料确定权系数m值的步骤。经岩心与测井资料验证,图版回归及应用预测平均绝对误差分别为4.26%和5.06%,比原方法有较大提高,满足海拉尔盆地复杂孔隙结构砂泥岩储层勘探工作的急需。 Hailaer Basin is a typical near-provenance rapid accumulation and fault basin. Its sandstone and mudstone reservoirs have a large number of microcapillary pores in addition to the movable fluid pores and clay water pores in the total pores. The pore structure is extremely complicated and the irreducible irreducible water saturation Degree becomes a problem. INTRODUCTION Using 10 different T2 spectral components (except 1 to 4 ms) of nuclear magnetic resonance logging in combination with conventional logging tФ and ФN-ФD data, 3 or 5 characteristic parameters were extracted from these 10 components It is considered that it is better to determine the irreducible water saturation directly by 10 components in the sandstone-mudstone reservoir with complex pore structure. This method is based on the geological characteristics of Hailaer Basin and NMR log data to determine the development of irreducible water saturation method based on T2 spectral coefficient method, eliminating the need to determine the value of weight coefficient m with a large number of core data. According to the core and well logging data, the average absolute errors of plate regression and application predictions are 4.26% and 5.06%, respectively, which are much higher than those of the original method to meet the urgent need of exploration for the sand and shale reservoirs with complicated pore structure in Hailar Basin.