摘要
前陆盆地是位于造山带前缘与相邻克拉通之间的沉积盆地,可以划分为4个构造单元,即楔顶带、前渊带、前隆带和后隆带。根据前陆盆地带成因和位置,可以分为3种类型:周缘前陆盆地、弧后前陆盆地和再生前陆盆地。前陆盆地的演化是个动态过程,具有递进式的演变特征。前陆盆地主要受到地貌载荷、俯冲载荷、动力学板块载荷等载荷的共同作用,引起岩石圈的挠曲。前陆盆地和挤压造山带是成对出现的,表现明显的耦合性和互补性。在前陆盆地中,最有利于油气富集的构造部位是双冲构造带底面逆冲断层上的断展背斜与滑脱背斜,隐伏逆冲前缘的断层扩展褶皱,以及被动顶板双冲构造所夹持的“三角带”。
A foreland basin is defined as a sedimentary basin deposited between frontal margin of orogenic belt and its adjacent craton.It can be divided into four structural elements such as wedge-top,foredeep,forebulge and back-bulge depo-zones.There are three kinds of fore-land basins classified in terms of origin and location:peripheral foreland basin,retroarc foreland basin and regenerated foreland basin.The evolution of it is a dynamic process with the feature of pro gressive development.A foreland basin mainly undergoes common processes of topo-graphic load,subduction load,dynamic plate load,thus resulting in lithosphere flexure.A foreland basin always occurs with compressional orogenic belt in pairs,showing distinct coupling and complementary nature.In a foreland basin,the most favorable hydrocarbon accumulation is the following structural locations:faulted-extensional anticline and decollement anticline on thrust faults in floor of double thrust structural zone,fault expanding fold of buried thrust fault front and“triangular domain“included by passive top double thrust structural zones.
出处
《新疆石油地质》
CAS
CSCD
2003年第1期87-91,共5页
Xinjiang Petroleum Geology
