地球物理学进展 ›› 2015, Vol. 30 ›› Issue (6): 2440-2447.doi: 10.6038/pg20150602

• 空间与固体地球物理 • 上一篇    下一篇

西准噶尔达尔布特断裂电性特征及成像

程怀蒙1, 张胜业2   

  1. 1. 湖北省地质调查院矿产资源调查中心, 武汉 430034;
    2. 中国地质大学(武汉)地球物理与空间信息学院, 武汉 430074
  • 收稿日期:2014-08-18 修回日期:2015-03-13 出版日期:2015-12-20 发布日期:2015-11-10
  • 通讯作者: 张胜业,男,1954年生,教授,主要研究方向为电法勘探.(E-mail:572579496@qq.com) E-mail:572579496@qq.com
  • 作者简介:程怀蒙,男,1985年生,汉族,吉林省公主岭市人,硕士研究生,主要研究方向为电法勘探.(E-mail:chmxh@126.com)
  • 基金资助:

    西准噶尔克拉玛依后山地区深部地质调查(1212011220245)资助.

Imaging and electrical characteristics of Dalabute fault in west Junggar

CHENG Huai-meng1, ZHANG Sheng-ye2   

  1. 1. Center of Mineral Resources Survey, Geological Survey of Hubei Province, Wuhan 430034, China;
    2. China University of Geosciences(Wuhan)Institute of Geophysics and Geomatics, Wuhan 430074, China
  • Received:2014-08-18 Revised:2015-03-13 Online:2015-12-20 Published:2015-11-10

摘要:

西准噶尔达尔布特断裂属于左旋走滑深大断裂,控制着西准噶尔地区的地质构造演化进程,同时对克拉玛依油田的形成有着较大的影响.以往针对达尔布特断裂的研究多集中于地质层面,而地球物理工作却几乎没有,物探资料严重缺失,因此开展相关的物探研究,完善达尔布特断裂电性剖面资料,对于今后该区域的研究工作意义重大.研究区域位于达尔布特断裂中段,长度为30 km,宽15 km,横跨断裂正上方,采用音频大地电磁法(AMT),使用MTU-Net台站式大地电磁仪及GMS-07型MT仪,垂直于断裂布线,线距2 km,点距1 km,共采集测点数据240个.利用二维OCCAM反演方法和快速松弛反演(RRI)反演方法进行二维反演,根据反演结果分析,区域内达尔布特断裂呈北东-南西走向,略呈弧形,沿阿克巴斯陶岩体边缘通过,总体表现为断裂两端1~6号线、11~16号线相对低阻,阻值范围在0.1~100欧姆米之间,中间段7~10号线相对高阻,阻值范围在100~1000欧姆米之间,断裂深度平均5 km左右,最大深度大于10 km,平均跨度2~4 km,断裂倾向南东.说明达尔布特断裂为深大断裂.

Abstract:

Dalabute Fault in West Junggar was classified as sinistral strike-slip deep fault, it controlled the process of tectonic evolution of the West Junggar region, and at the same time had a greater impact on the formation of Karamay Oilfield. In the past, the studies against the Dalabute Fault mainly focused on geological features of it, and because of geophysical work had rarely been conducted, there was seriously short of geophysical data. So carrying out related geophysical studies and enriching electrical profile data of the Dalabute fault was significant for the future research work in this region. The study region was located in the middle of Dalabute Fault, had a length of 30 kilometers and a width of 15 kilometers, just across the Dalabute Fault above, This study used Audio Magnetotelluric method (AMT), MTU-Net station type magnetotelluric instrument and ADU07 type magnetotelluric instrument were used to collect datas, perpendicular to the fracture wiring, line distance was two kilometers, point distance was one kilometer, 240 data points altogether were collected. This study selected OCCAM inversion method and rapid relaxation inversion method(RRI) to conduct two-dimensional inversion. Judging from the horizontal slice of the inversion result, the Dalabute fault in this region has a direction of NE-SW, slightly curved, along the edge of Akebasitao rock pass, deep resistivity values which the location along Dalabute Fault strike much lower than the surrounding rock, the fault characteristic is very clear, the overall performance is that:both ends of the fault like line1 to line 6, line11 to line 16 appear relatively low resistance, the resistance in the range of 0.1 to 100 ohms, the middle section line7 to line 10 has a relatively higher resistance, resistance range between 100 and 1000 ohms, the average depth of the fault is about 5 km, maximum depth greater than 10 km, the average span is 2~4 km, fault tendency is South East. All these datas demonstrated that the Dalabute Fault is a deep and large fault.

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