敦化盆地构造特征分析  

Structural characteristics analysis of the Dunhua Basin,China

作　　者：程三友[1] 刘少峰[2] 苏三 Cheng Sanyou;Liu Shaofeng;Su San(School of Earth Science and Resources,Chang′an University,Xi′an 710054,Shaanxi,China;School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;Chevron Asia South Ltd.,Beijing 100083,China)

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]中国地质大学地球科学与资源学院,北京100083 [3]雪佛龙德士古中国能源有限公司,北京100083

出　　处：《地质学刊》2020年第1期48-53,共6页Journal of Geology

基　　金：国家自然科学基金项目(41371220);中国石化东北勘探新区项目(DBKT2004-YJ-023);中央高校基本科研业务费专项资金项目(300102279105)。

摘　　要：采用构造地质学的研究方法,选取重磁资料和部分地震地质剖面进行二维构造-地层解释,揭示敦化盆地的总体结构特征和形成机制。结果表明,敦化盆地结构为2个近东西走向的断陷及其之间的隆起,控制性正断层与敦密断裂呈锐角相交,且在敦密主断裂处形成深断陷;北部断陷和南部断陷为典型的右旋走滑伸展盆地,主走滑断裂为敦密断裂。敦密深断陷内分布的下白垩统发育大量与敦密断裂斜交的正断层,右旋走滑作用始于早白垩世,古近—新近纪发生了再次断陷;敦化盆地受逆冲改造的时间为白垩—古近纪,逆冲方向主体指向北,该逆冲作用可能与东北地区晚白垩世之后的构造反转有关,导致沿敦密断裂发生左旋转换挤压作用。研究结果对敦化盆地的油气勘探具有参考价值。With the research method of structural geology,the gravity and magnetic data and some seismic geological sections were selected for two-dimensional structure-stratigraphic interpretation,revealing the overall structural characteristics and formation mechanism of the Dunhua Basin.The results show that the structure of the Dunhua Basin is composed of two roughly east-west trending faults and the uplift between them.The controlling normal fault intersects the Dun(hua)-Mi(shan)fault at an acute angle,and forms a deep fault depression at its main fault.The northern and southern fault depressions are typical right-lateral strike-slip extensional basins,with the main strike-slip fault being the Dun(hua)-Mi(shan)fault.The Lower Cretaceous strata distributed in the Dun(hua)-Mi(shan)deep fault depression develop a large number of normal faults intersecting with the fault.The right-lateral strike-slip effect began in the Early Cretaceous,and occurred again in Paleogene-Neogene.The Dunhua Basin was thrusted and transformed from Cretaceous to Paleogene.The main direction of the thrusting pointed to the north.This thrust may be related to the tectonic reversal after the Late Cretaceous in the northeastern region,which lead to the left rotation and extrusion along the Dun(hua)-Mi(shan)fault.The research results can provide reference for oil and gas exploration in the Dunhua Basin.

关 键 词：构造特征 构造样式 构造-地层解释 敦密断裂 敦化盆地 

分 类 号：P548[天文地球—构造地质学]