塔里木盆地西部罗斯塔格地区断裂特征和活动时代

Characteristics and timing of faults in Luositage area, the western Tarim Basin

赵岩，李勇，吴根耀，师骏，李曰俊，敬兵

通过对塔里木盆地西部罗斯塔格地区地震资料的构造解释，认为海米-罗斯塔格深部断裂是一条走滑-斜冲断裂，向东随冲断作用增强断裂带变宽，内部结构趋于复杂;其北西走向段以右行走滑为主，起构造变换作用。该断裂在白垩纪—古近纪早期活动，向北冲断，向下收敛于中-下寒武统膏盐层。同时活动的沙垅断裂向南西冲断，深切入基底。海米-罗斯塔格浅部断裂在更新世向北冲断，向下收敛于古近系底部膏盐层。罗斯塔格地区位于巴楚断隆的南界断裂带由近东西走向转变为近北西走向的部位，含油气断裂构造带发育欠佳，油气勘探前景不容乐观。

:Detailed interpretations of seismic profiles are carried out for analyzing features in the Luositage area，western Tarim Basin.The results reveal that the deep Haimi-Luositage fault is a strike-slipping-oblique thrust fault.Towards the east，the faultbeltbecomeswider and its inner configuration getsmore complex alongwith the intensification of thrusting.TheNW-striking segment of the fault is dom inated by dextral strike-slipping and acts as a relay structure.This fault activated in the Cretaceous-Early Paleogene when it thrusted northwards and ceased downwards in the Lower-Middle Cambrian salts.The contemporaneous Shalong fault thrusted southwest-wards and were deeply involved in the basement.The shallow Haim i-Luositage fault thrusted northwards during the Pleistocene and ceased downwards in salts at the bottom of the Paleogene.The Luositage area，situated in a relay zone where the southern boundary faultof the Bachu faulted uplift changes from nearEW striking into near NW-striking，is not a good place for the development of faultˉrelated structureswhere hydrocarbons can accumulate.Therefore，it is probably not a favorable lead.

10.11743/ogg20100612