作　　者： ; ; ; ; ; ;

机构地区： 中国科学院广州地球化学研究所

出　　处： 《天然气地球科学》 2011年第3期415-419,共5页

摘　　要： 松辽盆地北部徐家围子断陷在伸展裂陷过程中,受板块构造和深部地质作用的影响,经历了一次挤压构造反转,其应力场特征也相应地发生了变化:火石岭期和沙河子期为NEE—SWW向拉张应力场,拉张应力逐渐加强,在沙河子期达到最大,沙河子末期受郯庐断裂左旋作用转为NEE—SWW向弱挤压应力场,营城期则为NEE—SWW向强挤压、NNW—SSE向弱拉伸应力场,登娄库期形成的应力场基本平息,进入重力均衡作用阶段。通过对区域应力场的变化特征分析认为,沙河子末期郯庐断裂左旋产生的应力场对徐家围子断陷形成近SN向延伸的"S"型构造格局具有重要的影响。 Under function of plate tectonic and deep geology,the Xujiaweizi rift sag in the northern Songliao basin went through a reversal of compressional structure during the extended rifting process.The stress field was changed correspondingly.The direction of extensional stress field was NEE-SWW at the Huoshiling and Shahezi Periods,and the tensile stress strengthened gradually,and got the greatest at the Shahezi period.At the end of Shahezi Period,the tensile stress turned to weak compression stress field with NEE-SWW direction under the Tan-Lu fault left-rotation.At the Yingcheng Period there was weak compression stress field with NEE-SWW direction and weak tensile stress field with NNW-SSE direction.The stress field at the Denglouku Period quieted down and subsided into the gravity equilibrium phase.In this paper,based on regional stress field characteristics,we proposed that the stress field made by the left-rotation of Tan-Lu fault would be important to form the ＂S＂-type structure pattern of Xujiaweizi rift sag during the periods of late Shahezi and Yingcheng.

关 键 词： 应力场特征 构造格局 徐家围子断陷 松辽盆地

领　　域： [石油与天然气工程]