中国大陆东部盆地构造动力学分析

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在中国大陆东部地区,松辽、渤海湾和苏北等—系列中、新生代大中型含油气盆地与郯庐断裂具有密切的时空关系。郯庐断裂活动是邻近地区断裂变形、深部物质作用、岩石圈减薄、岩浆作用以及盆地形成和演化的主要控制因素。断裂活动和盆地动力学过程可以分为3个阶段。①在印支至早燕山运动期间,由于太平洋板块向北西俯冲,郯庐断裂发生大规模左行压扭活动。在松辽地区,派生的应力场使早期的地壳断裂成为郯庐断裂的分支,并发生张剪变形;在渤海湾和苏北地区,早期的两组剪切断裂联合成北凸的弧形断裂。由于断裂的触发与减压作用,地壳上部进一步张裂,形成断陷盆地。②从晚侏罗世开始至早白垩世,太平洋板块的俯冲作用时强时弱,郯庐断裂压扭与拉张裂陷交替进行。同时,由于重力均衡和深部幔隆的收缩作用,使松辽盆地整体下沉,渤海湾和苏北地区仍是幔隆和断陷盆地形成时期。③新生代期间,郯庐断裂分段活动,由于印度板块与欧亚板块的强烈碰撞效应,渤海湾、苏北地区和郯庐断裂带南段共同受到北西—南东方向的伸展变形,地幔再次拱升,渤海湾和苏北盆地形成 In the eastern part of mainland China, the Mesozoic and Cenozoic petroliferous basins in Songliao, Bohai Bay and North Jiangsu are close temporal and spatial relationships with the Tanlu fault. The Tan-Lu fault activity is the main controlling factor for the deformation and deformation of the adjacent area, the deep material function, lithosphere thinning, magmatism and the formation and evolution of the basin. Fault activity and basin dynamics can be divided into three stages. During the Indosinian-Early Yanshanian movement, due to the subduction of the Pacific plate to the northwest, a large-scale left-lateral compression-torsion occurred in the Tan-Lu fault. In Songliao area, the derived stress field made early crustal faulting a branch of Tancheng-Lumen fault and occurred shear deformation. In the Bohai Bay and northern Jiangsu area, the early two sets of shear faults combined with the northern convex arc fracture . Due to the triggering and depressurization of faults, the upper part of the crust further cracks and forms a faulted basin. ② From the beginning of the Late Jurassic to the Early Cretaceous, the subduction of the Pacific plate was stronger and weaker, and the compression-torsion and tensile rifting of the Tan-Lu fault alternated. At the same time, the Songliao Basin as a whole sinks due to the gravity balance and the shrinkage of deep mantle, while the Bohai Bay and northern Jiangsu are still the periods where the Mennonite and faulted basins were formed. During the Cenozoic, the Tan-Lu fault was segmented. Due to the strong collision between the Indian plate and the Eurasian plate, the Bohai Bay, northern Jiangsu and the southern Tancheng-Lujiang fault zone were both exposed to NW-SS stretch deformation and the mantle again Arch Sheng, Bohai Bay and the formation of the basin in northern
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