松辽盆地南部低渗透砂岩储层裂缝特征及其对油田开发的影响

松辽盆地南部的低渗透砂岩储层中普遍存在受断层和沉积微相控制的４组高角度构造裂缝，其中以近东西向裂缝渗透性最好，北西向和北东向两组裂缝对储层中流体的渗流也起着相当重要作用，这３组裂缝是油田开发井网布置时应考虑的主要因素。在泥岩夹层中，除了高角度构造裂缝外，还发育有低角度顺层滑脱裂缝，因此，该区泥岩的吸水能力普遍较强，对注水效果有重要影响，因而在注水时应严格控制注入压力。

CHARACTERISTICS OF FRACTURE OF SANDSTONE RESERVOIR WITH LOW PERMEABILITY IN SOUTHERN SONGLIAO BASIN

There are four groups of tectonic fractures controlled by fault and sedimentary microfacies in the low permeability sandstone reservoir in southern Songliao basin,in which the osmosis of fractures in the direction of EW are the best, and the fractures in the direction of NW and NE have a quite important role for seepage. The three groups of fractures are the main factors for the arrangement of developing pattern in the oilfield. In mudstone partings, both high dip tectonic fractures and low dip bedding detachment fractures were developed well. So the absorption of clay stone in the basin increased, which has the important influences on injection efficiency.