苏北盆地高邮凹陷基底先存断裂成因及其对新生断裂的控制

发布时间：2018-05-02 03:22

本文选题：断裂形成演化 + 断裂控制作用　；参考：《石油实验地质》2017年01期

【摘要】：真武断裂和吴堡断裂是苏北盆地高邮凹陷的2条重要基底先存断裂,形成于印支期下扬子板块与华北板块的俯冲碰撞,西部走向北东东、东部走向北北东。根据区域应力场、三维地震等资料,将这2条基底断裂对南部断阶带形成和演化的控制作用分为4个阶段:(1)构造挤压期,由于下扬子区北部与华北板块东南部的碰撞,形成了一系列的冲断构造、逆冲推覆及褶皱变形;(2)构造反转期,真武断裂由逆断层反转为正断层;(3)正向裂陷期,真1断层、吴1断层继承了真武断裂分段性特点,真武断阶带、吴堡断阶带分别受真1断层、吴1断层控制强烈;(4)斜向裂陷期,真武断阶带、吴堡断阶带受基底断裂控制作用逐渐减弱,南北向张应力起主导作用。真武断阶带和吴堡断阶带存在着构造差异变形,根据基底先存断裂对新生断裂的活动方式可分为4种类型,由强至弱依次分为继承型、派生型、调节型、诱导型。研究表明,基底先存断裂是高邮凹陷南部断阶带形成演化的基础,并强烈影响着新生断裂的发育。
[Abstract]:The Zhenwu fault and the Wubao fault are two important basement pre-existing faults in Gaoyou depression of Subei basin, which formed in the subduction collision between the Lower Yangtze Plate and North China Plate in the Indosinian period, and strike north to west and north to east in the west and north to east of the basin. Based on the regional stress field and 3D seismic data, the controlling effects of the two basement faults on the formation and evolution of the southern fault terrace are divided into four stages: 1) tectonic compression period, due to the collision between the northern part of the Lower Yangtze region and the southeast of the North China plate. A series of thrust structures, thrust nappe and fold deformations are formed during the inversion period, and the Zhenwu fault is reversed from the reverse fault to the normal fault in the normal faulting stage, the true 1 fault and the Wu 1 fault inherit the segmental characteristics of the Zhenwu fault and the Zhenwu fault terrace zone. The Wubao fault terrace zone is controlled by the true 1 fault and the Wu 1 fault strongly controlled by the fault. (4) the diagonal rifting period, the Zhenwu fault terrace zone and the Wubao fault terrace zone are gradually weakened by the basement fault, and the south and north direction tensile stress play the leading role. There are tectonic differential deformation in the Zhenwu fault terrace zone and the Wubao fault terrace zone. According to the activity patterns of the basement pre-existing faults to the new faults, they can be divided into four types, from the strong to the weak, which are divided into inheritance type, derivative type, regulating type and inductive type in turn. The study shows that the basement preexisting fault is the basis of the formation and evolution of the southern fault terrace in Gaoyou sag and strongly affects the development of the new fault.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国石油勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05028,2011ZX05009-002)资助
【分类号】：P618.13

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