| 西藏羊八井地热田物探新成果研究 |
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| 引用本文： | 吴钦.西藏羊八井地热田物探新成果研究[J].物探与化探,1996,20(2):131-140. |
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| 作者姓名： | 吴钦 |
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| 作者单位： | 西藏地矿局 |
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| 摘 要： | 羊八井地热田的物探工作可分为两个阶段。前期以直流电法为主,辅以地面重、磁测量,目的是圈定浅层热储的空间范围。后期则为了满足勘查深部热储的需要,采用大地电磁测深、频率电磁测深、微地震、地噪声测量等方法,与重、磁、电测深资料及化探、地质资料相结合,进行综合研究,取得了一些新成果,进一步肯定热源应为深达10km以下的局部岩浆房;深层热储主要位于热田北区,赋存于花岗岩破碎裂隙带中,深度约为1000-3000m,已有钻孔证实温度可超过300℃;热田南区的浅层热储属次生热储,热流体主要来自北区深部,在向南东渗流过程中,有大量冷潜水混入,使之降低了温度,但增加了流量。
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| 关 键 词： | 羊八井、物探新成果 |
| 收稿时间： | 1994-11-28 |
NEW ACHIEVEMENTS OF GEOPHYSICAL EXPLORATION IN THE YANGBAJING GEOTHERMAL FIELD OF TIBET |
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| Wu Qin.NEW ACHIEVEMENTS OF GEOPHYSICAL EXPLORATION IN THE YANGBAJING GEOTHERMAL FIELD OF TIBET[J].Geophysical and Geochemical Exploration,1996,20(2):131-140. |
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| Authors: | Wu Qin |
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| Institution: | XiZang Bureau of Geology and Mineral Resources; Lhasa 850000 |
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| Abstract: | Geophysical exploration work in the Yangbajing geothermal field might be divided into two stages.Employing the direct current method as the main method with the help of ground gravity and magnetic survey; the first stage aimed at delineating spatial limits of the thermal reservoir. The second stage was designed to meet the demand of deep thermal reservoir exploration and adopted suh methods as magnetotelluric sounding; frequency electromagnetic sounding; microseismogram sounding and ground noise survey in combination with gravity; magnetic and electric sounding data as well as geochemical and geological data. Such an integrated study yielded some' new achievements: the heat source of foe thermal field is further proved to be a localized magma chamber at the depth of more than 10km; the deep thermal reservoir is mainly located in the north of the thermal field and occurs in the shatter fissure zone at the depth of some 1000 - 3000m with the temperature evidenced by borehole data to be in excess of 300℃; the shallow thermal reservoir in the southern district of the thermal field is a secondary reservoir: the thermal fluid came mainly from the depth of the northern district; and when percolating southeastward; the thermal fluid was mixed with large quantities of cool groundwater; thus reducing the temperature but increasing the flow rate. |
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| Keywords: | Yangbajing new achievements in geophysical exploration |
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