跃进二号东负反转走滑构造识别及成因

Identification and genesis of the strike-slip negative inversion structure in eastern Yuejin2

柴达木盆地是被昆仑、祁连、阿尔金造山带所围陷的大型含油气盆地,在印支期完成板块的拼合后进入了陆内变形时期,中、新生代盆地发育受喜马拉雅地块与亚欧大陆以及印度板块与亚欧大陆等碰撞的影响,经历了复杂的沉积、构造演化过程,断裂构造和褶皱构造都很发育。为了揭示柴达木盆地跃进二号东新生代构造特征及成因,通过地震资料精细构造解释以及构造演化剖面以阐明研究区平面和剖面构造特征。分析表明,走滑构造发育经历了七个泉组沉积末期强烈的压扭构造作用,发育了正花状构造样式,而至柴达木组沉积的前期构造又经历了强烈的张扭构造作用,发育了负花状构造,且叠加在早期正花状构造之上,使得浅层层序主要发育正断层,两期走滑断裂作用叠加产生了现今复杂的负反转走滑断裂带。跃进二号东叠加走滑构造模式的建立为柴达木盆地区域构造发育历史研究提供了重要的地质信息。

Qaidam basin is surrounded by the Kunlun and Qilian,Altun orogenic belt in the large oil and gas basin, Indosinian period after complete plate split into intracontinental deformation period, by Himalayan block, Cenozoic basins in the development and the Eurasian and Indian plate and the Eurasian collision etc, has experienced a complicated sedimentary and structural evolution process, fracture and fold structure is development. In order to reveal the structural characteristics and genesis of the eo-Cenozoic era in Yuejin No.2 of Qaidam basin, the plane and sectional structural characteristics of the study area are illustrated by fine tectonic interpretation of seismic data and tectonic evolution profiles. Analysis showed that the strike-slip tectonic development has experienced seven springs group of the late sedimentary strong compressive shear structure, the development is flower tectonic style,to the prophase of Qaidam group sedimentary structure by experienced strong transtensional tectonic setting, develop a negative flower structure, and superimposed over early positive flower structure, and makes the shallow layers of main development normal fault, two phase of the superposition of strike-slip faulting produced today’s complex negative inversion of strike-slip fault zone. The establishment of the east superimposed strike-slip tectonic model of Yuejin No.2 provides important geological information for the study of regional tectonic development and history in Qaidam basin.