塔西南坳陷油气与圈闭控油作用

Oil/ Gas and Effects of Trapments in the Southwestern Depression , Tarim Basin

刘生国,胡望水,谢锐杰

Liu Shengguo, Hu Wangshui, Xie Ruijie

江汉石油学院石油地质系

Jianghan Petroleum Institute , Jingsha 434102 , Hubei , P. R. China

塔西南坳陷自下而上共沉积有5 套生油岩系,生油—油气运移晚于圈闭形成或基本匹配。海西期和喜山期构造运动对圈闭形成起重要作用,圈闭类型可划分为构造圈闭与非构造圈闭2 大类,前者细分为背斜圈闭和断层圈闭2 亚类。圈闭的发育与分布受控于断裂和不整合面的发育分布,构造圈闭是西南坳陷油气聚集的主要场所,油气聚集空间分布规律依赖于圈闭的空间展布规律,不同时期圈闭有不同的控制油气聚集作用,圈闭保存直接影响油气保存。
集

There are five deposited source beds from up to down in the southwestern depression in Tarim Basin. Oil - generation and oil/ gas migration are later or mainly mate for the formation of traps. Tectonic movement in Hercynian and Himalayan orogenic stage is important to the formation of traps. Traps are classifield into two groups : the structural trap and the non - structural trap. The former can be subdivided into two sub - types : the anticlinal trap and the fault trap. The development and distribution of traps are controlled by fault zone and unconformable side. The structural traps provide major places for petroleum accumulation , and the spatial distribution of petroleum accumulation is in accordance with that of traps. The control of different trapment to the petroleum accumulation is different , depending on their different timing. The preservation of traps exert it sinfluences directly on petroleum preservation.