收稿日期: 2009-12-11
修回日期: 2011-04-07
网络出版日期: 2011-06-10
基金资助
大庆油田科技攻关项目“徐家围子断陷形成演化机制研究”资助.
Characteristics of Stress Field and Mechanism of “S” Structure Pattern in Xujiaweizi Rift Sag#br#
Received date: 2009-12-11
Revised date: 2011-04-07
Online published: 2011-06-10
夏斌, 邱亮斌, 蔡周荣, 张俊领, 郭峰, 刘维亮 . 徐家围子断陷应力场变化特征及“S”型构造格局成因探讨[J]. 天然气地球科学, 2011 , 22(3) : 415 -419 . DOI: 10.11764/j.issn.1672-1926.2011.03.415
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.
Key words： Stress field; Tectonic pattern; Xujiaweizi rift sag; Songliao basin.
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