潮水盆地构造特征

Structural characteristics of Chaoshui Basin

为了研究潮水盆地中生代断层展布特征、断层之间的相互联系以及断裂系统是否控制沉积作用,借助地震剖面绘制出了盆地内多条地震地质剖面和不同时期所形成的断裂展布图。研究认为:盆地内主要经历了4期构造运动,构造特征复杂多样,其中早—中侏罗世主要形成一系列近东西走向的正断层,在一定程度上控制了沉积作用;晚侏罗世主要形成一系列近东西走向的逆断层,对沉积无影响;早白垩世仅在陈家新井凹陷形成一些小型正断层,其对沉积作用影响不大;新生代除了形成一系列东西走向的逆冲推覆断层外,部分早—中侏罗世形成的正断层反转。盆地的演化经历了早—中侏罗世的断陷成盆期、晚侏罗世的坳陷期、晚侏罗世末到白垩纪的隆升萎缩期和新生代喜山运动的改造消亡期4个阶段。盆地内生油层、储层和盖层发育良好,具有形成构造圈闭的条件,沿着断裂带寻找构造圈闭将是下一步的勘探方向。

In order to clarify the fauh distribution characteristics, the connectinn between the faults, and that the deposition whether is controlled by the fauh system, a number of geological sections and the fanh distrihution map formed in different geological perinds were drawn up. The study result shows thai the Chaoshui Basin experienced four times of tectonic movement, and formed complex structural features in （leferent tectonic movement. In Early-Middle Jurassic, it formed a series of EW strike normal faults, which ennlrol deposition in some degree. In Late Jurassic, it formed a series of EW strike abnormal faults, which have no effect on deposition. In Early Cretaceous, there only formed some small- size of normal faults in Chenjiaxinjing sag, which have little effect on deposition. In Cenozoie, there formed a series of thrust fauhs, and some normal fauhs formed in Early-Middle Jurassi（- were reversed. The evolution of the basin inc＇lu^te the rift basin period of Early-Middle Jurassic, the depression period of the Late Jurassic, the uplifting and atrophy period from the end of the Late Jurassie to Cretaceous, and the transformation die period of the Himalayan teclonic movement in the Cenozoic. The source bed, reservoir and caproek in the basin developed well, so there are good conditions for forming structural traps in the Chaoshui Basin. It will be the next exploration work to looking for structm-al traps along the fauh zone.