塔里木盆地东北地区断裂类型与油气远景

FAULT TYPES AND HYDROCARBON POTENTIAL OF NORTHEASTERN TARIM BASIN

该区发育有叠瓦逆冲断裂带、褶皱和逆冲断裂带、背冲断裂带、反向逆冲断裂、推覆构造和走滑断裂带等断裂样式,它们的形成受控于侧向挤压作用、重力作用、基底控制作用和不均匀推覆作用,在控制油气运移、聚集和油气藏形成方面起着重要作用。

Field survey and seismic reflection profiles indicate that the followingmain fault types exist in northeastern Tarim Basin:1.imbricate thrustbelt;2.fold and thrust belt;3.recoil thrust belt;4.antithetic thrustfault;5.nappe tectonics;6.strike-slip faults.The formation of the thrustswere mainly controlled by regional stress field resulted from lateral comp-ression.Other factors are gravitation,basement control and diseguilibriumthrusting. Fault structures in this area play an important role in controllinghydrocarbon accumulation.Recoil thrust belt in Shaya Uplift and Akum,fronts of Shajinzi and Luntai major thrusts,antithetic thrust in Bostan,strike-slip fault belt in Karayergun and western Shaya and the fold,thrustbelt in Kuche Depression are favourable zones for oil accumulation.