【摘要】 传统上认为前陆冲断带内部的背斜构造具有"成排成带分段"的特征,在表观认识和宏观尺度上讲,容易理解这一特征,并且通过"成排成带分段"的解剖,直接为含油气区带评价和地震解释方案的落实提供指导作用。随着前陆冲断带深层结构的精细解剖和三维空间内构造变形的准确刻画,发现前陆冲断带深层构造变形的分布并非成排成带分段的特征,褶皱构造的发育与分布明显受前陆冲断构造位移量及各个断层位移量的大小所控制,各个断层控制的逆冲岩席在垂向上相互叠置、侧向上交叉对接、走向上错落有致,3D立体空间内由多个次级弧形体组成鳞片状分布。本文以中国天然气勘探最为成功、勘探资料最为详实的库车坳陷克拉苏构造带为例,通过地震剖面精细构造解释,揭示出构造变形的运动学特征及其构造位移量在传播过程中的分异和转换,进而控制冲断带内部构造岩席的生长发育和空间展布特征,并在3D立体空间内揭示冲断岩席受构造位移量的控制而成鳞片状分布的规律,控制这一分布规律的主控因素是冲断构造位移量与冲断岩席长度之间定量的几何关系。这一认识提升了油气藏评价和构造圈闭描述的精度。更多还原

【Abstract】 The anticline within the foreland thrust belt is generally considered to show a certain characteristic with structural zonation and segmentation.That is easy to understand at an apparent macro-level and can provide guidances to evaluation of the hydrocarbon-rich province and implementation of the seismic interpretation.However,according to fine description of deep structures and 3D structural model in the foreland thrust belt,the spatial distribution of deep structures in the foreland thrust belt does not simply show as zonated and segmented structures but significantly show the length and the spatial distribution of deformation are controlled by overall thrusts and each thrust displacements.The thrust sheets overlay each other in the vertical direction,scatter along the strike and distribute scale-like in 3D space.This study focuses on the Kelasu fold-thrust belt in Kuqa depression where we made great success of gas exploration and obtained detailed underground data.Structural interpretation of regional seismic profiles shows the growth and spatial distribution of thrust sheets in the fold-thrust belt are dominated by the lengthwise division and lateral transition of tectonic displacement.And 3D structural modeling indicates the thrust sheets have a behavior of scale-like distribution that in general was controlled by the quantitative geometric dependence between tectonic displacement and thrust sheet length.更多还原