塔里木盆地西南坳陷的圈闭特征及其控油作用

Characteristics and Effects of Trapments on Petroleum Accumulation in Southwestern Depression, Tarim Basin

在详细分析塔里木盆地西南坳陷地面地质资料和大量高质量地震剖面的基础上，依据圈闭的成因和特征，将塔西南坳陷的圈闭分为构造圈闭和非构造圈闭两大类，前者又细分为背斜圈闭和断层圈闭两亚类。圈闭的形成与发育受构造运动控制，圈闭的分布与断裂构造带展布有明显的依存关系。构造圈闭是塔西南坳陷油气富集的主要场所，油气聚集空间分布规律依赖于圈闭的空间展布规律。圈闭叠加有利于复式油气聚集带的形成，圈闭保存直接影响油气保存。不同期圈闭有不同的控制油气聚集作用。

Traps in the southwestern depression of the Tarim basin are classified into two grouchs the structural trap and the non-structural trap,and the former can be subdivided into two sub-types,i.e. the anticlinal trap and the fault trap based on their genesis and characteristics. The formation and development of traps are controlled by tectonic movement,while their distribution depends fundamentally upon the spreading of fault zones.The structural traps provide major places for petroleum accumulation,and the spatial distribution of petroleum accumulation is in accordance with that of traps.The superposed traps are favorable to the formation of the composite petroleum accumulation zone. The preservation of traps exert its influences directly on petroleum preservation. The control of different trapments to the petroleum accumulation is different,depending on their different timing.