新疆石油地质

新疆石油地质 ›› 1994, Vol. 15 ›› Issue (1): 16-21.

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准噶尔盆地南缘地震速度异常解释

周晓吉   

  1. 新疆石油管理局地调处 乌鲁木齐 830008
  • 收稿日期:1993-08-20 出版日期:1994-03-01 发布日期:2020-08-06
  • 作者简介:工程师 石油地球物理勘探

INTERPRETATION OF SEISMIC VELOCITY ANORMALY IN SOUTHERN MARGIN OF JUNGGAR BASIN

Zhou Xiaoji   

  1. Engineering, Petroleum Geologysical Development of Geological Survey, Xinjiang Petroleum Administration Bureau, Urumq 830008
  • Received:1993-08-20 Online:1994-03-01 Published:2020-08-06

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摘要： 准噶尔盆地南缘是地震速度异常较发育的地区,通过对阜康断裂带地质构造、岩性特征的分析,查明断裂上盘是由巨厚的上古生界至中生界所组成的送中断块以及沿山麓分布的冲积扇体,具有很高的层速度(>3900m/s),它们是造成该区地震速度陷阱的两个重要因素。针对该区地震速度平面变化剧烈的特点,采用人机联作分层制作速度平面图的方法,查清了盆地南缘地震速度的变化规律,从而提高丁地震资料的处理质量,更准确地反映了地下构造形态,先后排除了台3井区、小泉沟背斜、独北背斜的地震速度陷阱,进一步落实了独南背斜、西湖背斜的构造形态,有利地指导了该区的油气勘探工作。

关键词: 准噶尔盆地南缘, 地震速度异常, 逆冲断块, 山麓中积扇

Abstract: The southern margin of Junggar Basin is the area that developed seismic velocity anomaly in general. By analysing the geologic structures and lithologic characteristics of Fukang fault zone, it is ascertained that layer veloci­ties of enormously thick thrust block (Upper Paleozoic-Mesozoic)and alluvial fan body distributed along the foot of the mountain are very high(>3 900m/s),they were two important factors which formed seismic velocity pitfalls. Con­sidering the characteristics of steepness in lateral seismic velocity variations, the seismic velocity trends in southern margin of Junggar Basin were ascertained using interactive processing for layering to draw velocity sections, thus im­proving processing quality of seismic data and reflecting subsurface structural patterns more correctly. Seismic velocity pitfalls of Well Tai 3 area. Xiaoquangou anticline and Dubei anticline were removed and structural patterns of Dunan anticline and Xihu anticline further determined. It is advantageous to guide oil-gas exploration work in this area.

Key words: Southern margin of Junggar Basin, Seismic velocity anomaly, Thrust block, Alluviat fan