Abstract: The Shanbei oil pool in Jiuxi basin with sandstone reservoir beds of the Huoshaogou Formation of the Eogene,has long been taken as an example of hydrodynamically trapped oil pools.The author made a profound analysis about the so-called Shanbei bydrodynamically trapped oil pool according to the theoretical conditions for the formation and preservation of a hydrodynamic trap and the practical hydrodynamic conditions of Shanbei oil pool,and found that even if the sandstone reservoir beds ofHuoshaogou Formation in Shanbei area composed a complete flexure without cutting of faults,the hydrodynamic conditions now existing in the formation under interest can by no means keep a "hydrodynamic trap".

Key words: hydrodynamic trap, oil-water contact, piezometric surface, Shanbei oil pool, Jiuxi Basin

摘要： 酒西盆地单北油田下第三系火烧沟组砂岩油藏长期以来被认为是水动力圈闭油藏的范例.根据水动力圈闭油藏形成和保存的条件以及单北油藏目的层地下水动力条件等实际资料对所谓“单北水动力油藏”进行了分析,发现:即使单北地区火烧沟组砂岩储层是一个完整的挠曲构造而根本没有被断层切割的话,那么目前的水动力条件也绝不可能形成“水动力圈闭”.

关键词: 水动力圈闭, 油水界面, 测势面, 单北油藏, 酒西盆地