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经典的前陆盆地的概念可定义为 :形成于收缩造山带与相邻克拉通之间 ,平行于造山带呈狭长带状展布的不对称冲断挠曲盆地。此定义包含了前陆盆地的分布位置和地壳性质、动力学机制与发育时限、平面展布、剖面结构以及相应的沉积建造等主要特征。但前陆盆地的基本结构和主要单元的位置在不同演化阶段是变化的 ;其规模和形态及含油气性也差别较大。以盆地所处的地球动力学环境为基础 ,将前陆盆地分为周缘前陆盆地、弧背前陆盆地和分裂前陆盆地三类。前两类为基本类型。中国中西部一些造山带周缘的压性盆地 ,总体具有前陆盆地的结构、变形和沉积特征。根据其形成的动力来源、发育时限和主要特征 ,将其作为一种新的盆地类型列出 ,命名为陆内前陆盆地。与弧背前陆盆地和周缘前陆盆地相并列 ,并对应于板块构造演化历程中的大洋消减、大陆碰撞和陆内缩短三个不同性质的聚敛阶段。前陆盆地的确定依据和研究内容主要有 :(1)构造属性 ;(2 )发育时限 ;(3 )盆山耦合 ;(4)区域背景 ;(5 )原盆面貌 ;(6)演化过程 ;(7)沉积响应 ;(8)纵向分区等。在确定前陆盆地时 ,应注重该类盆地的共性 ;在研究时 ,应突出具体对象的个性
The concept of a classic foreland basin can be defined as an asymmetric thrust-flexing basin formed between a contracted orogenic belt and an adjacent craton, parallel to the orogenic belt. This definition includes the distribution characteristics of the foreland basin and crustal properties, dynamic mechanism and development time, plane distribution, section structure and the corresponding sedimentary construction and other major features. However, the basic structure and the location of major units in the foreland basin vary in different stages of evolution; their size and morphology and oil and gas bearing vary greatly. Based on the geodynamic environment of the basin, the foreland basins are divided into three types: the peripheral foreland basin, arc back foreland basin and split foreland basin. The first two types are the basic types. The pressured basins on the periphery of some of the orogenic belts in central and western China generally have the characteristics of structure, deformation and sedimentation of the foreland basins. Based on the source of its dynamics, its developmental timing and its main features, it is listed as a new type of basin and named inland foreland basin. Which are in parallel with the arc-back foreland basin and the peripheral foreland basin, and correspond to three different convergent stages of oceanic reduction, continental collision and intra-continental shortening in the tectonic evolutionary process of the plate. The basis and contents of the foreland basin are: (1) tectonic attribute; (2) development time; (3) basin-mountain coupling; (4) regional background; (5) original basin appearance; (6) evolution process; 7) deposition response; (8) vertical partitions and so on. In determining the foreland basin, attention should be paid to the commonality of such basins; in the research, the individuality of the specific object should be highlighted