塔里木盆地中北部断裂体系划分及形成机制探讨

发布时间：2018-11-26 11:02

【摘要】：基于地震地质解释,刻画了塔里木盆地中北部断裂体系的平、剖面特征,分析了不同断裂体系的结构模式、形成机制及演化历史。结果表明,该区分为4个断裂体系:(1)托普台"X"型走滑断裂体系,下古生界主要发育NNE、NNW向"X"型共轭剪切破裂及"1"字形直立构造、正花状构造,而中新生界多表现为NNE向雁列式张性正断裂及负花状、堑垒构造;(2)塔中NW向逆冲断裂体系,以近NW向基底卷入式或滑脱式逆冲断裂为主,发育"y"字形构造;(3)顺托NE向走滑断裂体系,奥陶系及以下层系表现为近NE向左旋走滑及"1"字形直立、正花状构造,而志留-泥盆系主要发育近NE向雁列式张性正断裂及负花状、堑垒构造;(4)塔河盐下"T"型断裂体系,下古生界层系由近EW向逆冲断裂与近SN、NNE向走滑断裂组成,中新生界层系主要发育NEE向、近SN向雁列式张性正断裂组。断裂体系的研究明确了研究区压扭走滑和张扭走滑作用的叠加改造过程,认为主要受控于盆缘古洋盆5期的消减闭合及碰撞造山作用。结合研究区构造动力学背景分析,将该区断裂体系的演化过程划分为中晚奥陶世的强挤压弱走滑期、晚志留—中泥盆世的强挤压强走滑期、晚石炭—早中二叠世的强拉张弱走滑期、晚二叠世—三叠纪的强挤压弱走滑期和侏罗纪—新近纪的弱挤压弱走滑期。
[Abstract]:Based on seismic geological interpretation, the flat and profile characteristics of fault system in the central and northern part of Tarim Basin are described, and the structural models, formation mechanism and evolution history of different fault systems are analyzed. The results show that the area is divided into four fault systems: (1) the "X" type strike-slip fault system of Toputai, in which the NNE,NNW conjugate shearing fracture to "X" type and the "1" zigzag vertical structure are mainly developed in the Lower Paleozoic. The Mesozoic and Cenozoic strata are characterized by NNE echelon extensional positive faults, negative flower-like and graben structures. (2) in the NW thrust fault system in the tower, the near NW basement involvement type or slip thrust fault is dominant, and the "y" zigzag structure is developed; (3) in Shunto NE strike-slip fault system, Ordovician and its lower layers show near NE strike-slip and "1" vertical, orthotypic structure, while Silurian Devonian mainly developed near NE extensional positive faults and negative flowers. Graben structure; (4) the "T" type fault system under Tahe salt, the Lower Paleozoic strata are composed of near EW thrust fault and near SN,NNE strike-slip fault, the Mesozoic strata mainly develop NEE direction, and the near SN oriented Yanliang type tensional normal fault group. (4) the lower Paleozoic strata are composed of near EW thrust fault and near SN,NNE strike-slip fault. The study of the fault system clarifies the superposition and transformation process of the compression-torsional strike-slip and the tension-torsional strike-slip in the studied area, and it is considered that it is mainly controlled by the subtractive closure and collision orogeny of the Paleo-oceanic basin in the margin of the basin. Based on the tectonic dynamic background analysis of the study area, the evolution process of the fault system in this area is divided into the strong compression and weak strike-slip period of the Middle late Ordovician and the strong compressive strong strike-slip period of the late Silurian and the Middle Devonian. The late Carboniferous early Permian strong extensional weak strike-slip period, the late Permian-Triassic strong compression-weak strike-slip period and the Jurassic-Neogene weak compression-weak strike-slip period.
【作者单位】：西南石油大学地球科学与技术学院;中国石化西北油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划“973计划”项目(2012CB214800) 国家科技重大专项(2011ZX05005-004)资助
【分类号】：P618.13

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