大庆长垣南部油田砂体零散，油层薄，泥质含量高，渗透率低，原油粘度低，沥青胶质含量少。针对这些特点进行了界面张力、牺牲剂对表面活性剂吸附量的影响及天然岩芯驱油等试验，并研究了采出水中 Ｃａ~（２＋）、 Ｍｇ~（２＋）离子含量降低的原因。试验结果表明：应用复合碱可改善复合体系与原油间界面张力；牺牲剂可使表面活性剂在油砂上的静吸附损失降低 ４０％左右；应用筛选出的三元复合驱配方，用天然岩芯进行室内驱油试验，采收率比水驱提高 ２０％左右。此复合驱技术具有推广应用价值。 The Daqing Changyuan southern oilfield has scattered sand bodies with thin oil layers, high clay content, low permeability, low crude oil viscosity and low asphaltene content. The interfacial tension, the influence of sacrificial agent on the sorption capacity of surfactant and the natural oil displacement of core were studied. The causes of the decrease of Ca2 + and Mg2 + in the produced water were also studied. The experimental results show that the application of the compound alkali can improve the interfacial tension between the composite system and the crude oil; the sacrificial agent can reduce the static adsorption loss of the surfactant on the oil sand by about 40%; the application of the selected compound flooding formula, For indoor oil displacement test, the recovery rate is about 20% higher than that of water flooding. This composite drive technology has the promotion and application value.