【摘要】 塔西南拗陷甫沙构造带是西昆仑山前第一排冲断褶皱带。由于浅层覆盖第四系巨厚黄土及深层强烈冲断褶皱变形导致地震资料品质较低,构造解释具有多解性。通过综合分析区域构造背景、地面地质、钻井和地震资料,认为浅层是以上白垩统—古近系膏盐岩为滑脱层的盖层滑脱褶皱变形;深层是基底卷入的中—高角度区域性正反转断层,及在正反转断层下盘由叠瓦状分支逆冲断层组成的楔状叠瓦构造,深、浅构造层整体"分层收缩、垂向叠置"模型能合理解释现有的可靠构造信息。正反转断层在横向上分隔甫沙构造带与西昆仑褶皱造山带,膏盐岩塑性滑脱层在纵向上分隔浅层新生代与深层中生代构造变形。西昆仑山在新近纪—第四纪隆升,引发了自西昆仑山深层向塔西南拗陷斜向向上挤压,促使侏罗—白垩纪区域性先存正断层反转,并控制甫沙构造带的形成演化。更多还原

【Abstract】 Fusha structure zone in South-western Depression of Tarim Basin is the first row of thrust-fold zones next to west Kunlun Mountain.The thick Quaternary loess in shallower level and complex thrust-fold deformation in deeper level make it difficult to interpret the structure and the final structural model is of ambiguity.On the basis of areal tectonic background,geological data,drilling and seismic data,the structural interpretation model of Fusha structure zone is discussed,and conclusion is thrust-fold in the shallower level detached on top of the salt-gypsum rock of the Upper Cretaceous and Paleocene,but the deeper layer under the salt-gypsum rock develops a set of thrusts and assembles to a wedge imbricate fan.The tailing fault in the imbricate fan is a basement-involved thrust with middle-high angle,and could be the master thrust as a result of pre-existing regional normal fault inverted.The model of "delaminating contraction and vertically stacking" could be more reasonable to explain the acceptable and trusty structural information in the seismic profile.Inverted normal faults separate Fusha structural zone and west Kunlun folded orogenic zone in horizontal direction.Cenozoic structure in shallower level and Mesozoic structure in deeper level is separated by the salt-gypsum rock.West Kunlun Mountain uplift from Neocene to Quaternary,promoting the deeper level of west Kunlun Mountain extruding to south-western Depression of Tarim Basin,impelling the pre-existing normal faults to invert and controlling the formation and evolution of Fusha structure zone.更多还原