Abstract: The Tarim basin has undergone a long tectonic evolutionary history,the period of thebasement formation,the cratonic basin evolution and the foreland basin evolution.The basinhad developed twenty-two sequence boundaries,among which seven regional unconformitiesoccurred,that is,the bottom uncomformity of the Sinian,Silurian,Devonian,Carboniferous,(upper Permian-) Triassic,Jurassic and Tertiary respectively,occurring in or between the cra-tonic basin and its upper foreland basins,they had resulted from the relative change of sealevel,tectonism or their interaction.The unconformities had great influence on the oil and gasaccumulation:(1) formed a lot of traps on the upper and lower of them;(2) modified thereservoir conditions and(3) constituted a farway passage for oil and gas long-range migration(together with its upper laminar sandstones).The exploration for oil and gas pools related tothe unconformities has more important and real significance.

Key words: Tarim basin, unconformity, craton, foreland basin, sea level, fluctuation

摘要： 塔里木盆地经历了基底形成阶段、克拉通盆地阶段和前陆盆地阶段的长期构造演化.盆地发育了22个层序界面,其中有七个区域地层不整合面,即震旦、志留、泥盆、石炭、上二叠统-三叠、侏罗、第三系底部不整合,分别发育在克拉通盆地或其上前陆盆地或二者之间.这些不整合面为海平面相对变化与构造运动的共同产物.不整合面对油气聚集有重要意义:在不整合面上下形成大量圈闭;改造了储集条件;不整合面(及其上薄层砂岩)是油气长距离运移的有利通道.有关不整合油气藏的勘探在塔里木盆地具有较重要的现实意义.

关键词: 塔里木盆地, 不整合, 克拉通, 前陆盆地, 海平面升降