Geological Structure Characteristics of the Luliang Basin and Adjacent Areas in Central Yunnan Detected by Audio Magnetotelluric Method
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摘要:
陆良盆地是云南面积最大的新生代（新近纪）盆地，构造活动活跃。采用音频大地电磁测深对盆地及邻区进行探测分析，有效确定了研究区地下的电性、地质及结构特征。判识断裂20（F1-F20）条，其中曲靖–陆良断裂带（F15-F18）对盆地形态特征影响极大；在盆地地段，判识7条隐伏断裂，并可能在第四纪期间仍具有一定活动性，主边界断裂为盆地东缘断裂，具有显著的正断层活动特征。盆地充填地层从地表到深部可依次划分为第四系和新近系茨营组（N2c1-4 ）一段至四段共５层，在剖面上显示其深度超过
1000 m，整个盆地中心深度超过1600 m。确定了盆地结构形态特征，证实了陆良盆地为新生代近SN向的箕状断陷盆地，基底为泥盆系、石炭系和二叠系。实例表明音频大地电磁测深对盆地探测是有效的地球物理方法。Abstract:The Luliang Basin with active tectonics is the largest Cenozoic (Neogene) basin in Yunnan Province.The audio magnetotelluric sounding was effectively used to detect and analyze the underground spatial electrical properties and structural characteristics of the basin and its adjacent areas.Twenty faults (F1-F20) were identified, including the Qujing-Luliang fault belt (F15-F18) that has a great impact on the basin morphology;seven concealed faults in the basin section that probably continue active during the Quaternary period;and the main boundary faults at the eastern edge of the basin characterized by significant normal fault movement.The profile shows that its depth is more than
1000 m, and the depth of the whole basin center is more than1600 m. The strata in the basin from surface to deep has been divided into five layers comprised of the Quaternary and the first to the fourth Members of Neogene Ciying Formation (N2c1-4). The structural and morphological characteristics of the basin suggest that the Luliang basin is a Cenozoic SW trending dustpan fault basin, with Devonian, Carboniferous and Permian basement.The example shows that audio magnetotelluric sounding is an effective geophysical method for basin exploration.-
Key words:
- Luliang Yunnan Province /
- basin /
- audio-frequency magnetotelluric method /
- electrical /
- Fracture
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表 1 岩石电性电阻率统计表
Table 1. Statistical table of electrical resistivity of rocks
岩性 测定组数 地层 电阻率ρs（Ω·m） 变化范围 平均值 表层黏土 33 Q 10～132 24 表层黏土 48 N2c 30～233 85 砂石、砾石 12 N2c 134～265 161 砾岩 36 N2c、E3c 4～200 39 砂岩 64 Nh1l、C1w、Pt1 nt 17～436 125 页岩、砂岩 22 E3c 179～365 287 灰岩 64 D2q、P2y 570～ 2016 1 072 白云岩 30 Cd 702～ 2452 1 326 
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表 2 钻孔测井及地震数据对应茨营组各段的深度统计表
Table 2. Depth statistics for each section of the ciying formation corresponding to logging and seismic data
钻孔 深度（m） 地层 钻孔 深度（m） 地层 钻孔 深度（m） 地层 陆14井 0～290 N2c4 陆11井 0～400 N2c4 陆15井 0～490 N2c4 290～470 N2c3 400～710 N2c3 490～860 N2c3 470～660 N2c2 710～860 N2c2 860～990 N2c2 860～970 N2c1 990～ 1110 N2c1 陆2井 0～370 N2c4 陆9井 0～500 N2c4 陆10井 0～475 N2c4 370～600 N2c3 500～880 N2c3 475～780 N2c3 600～ 1260 N2c2 880～ 1450 N2c2 780～ 1085 N2c2 1260 ～1300 N2c1 1450 ～1630 N2c1 1085 ～1170 N2c1
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