泰国呵叻盆地H区块二叠系-三叠系构造特征研究

利用三维地震、钻井等资料,结合区域构造演化分析,对泰国呵叻盆地H区块二叠系-三叠系构造特征进行综合研究。研究表明,H区块主要经历了印支Ⅰ期强烈拉张裂陷、印支Ⅱ期回返拉张以及喜山期热沉降三个发育期;区块内存在四个明显的不整合面,目的层主要包括三叠系与二叠系、中三叠统与下三叠统不整合。自下而上可划分为石炭系、二叠系以及中下三叠统三个构造层。构造单元分为南部斜坡、北部断裂两个构造带,区内断裂发育,主要为张性断裂,走向主要有北西向、北西西向和北东向三组;构造样式以基底卷入型为主,在剖面上存在"倒梳状"、"Y"字型、反"Y"字型以及"X"型等多种构造样式。

Permian-Triassic tectonic characteristics in H area of Khroat basin

By using 3D seismic and drilling data, combined with regional tectonic evolution, Permian-Triassic tectonic characteristics in H area of Khroat basin were studied. The results indicated H area mainly experienced three developmental stages, strong tensile fracture trap Indosinian stageⅠ, return tension of Indosinian stageⅡand Himalayan thermal subsidence period. There were four distinct unconformable surfaces that was TriassicPermian, middle Triassic series-lower Triassic. Structural layer could be divided into Carboniferous, Permian, middle and lower Triassic. It was divided into two tectonic units which were southern slope and northern fault tectonic units. The tensile faults with NW, NWW, and NE strike, were well developed in the area. Tectonic styles were basement-involved, which were ‘collapsed comb', ‘Y', ‘Inverted Y' and ‘X' tectonic types.