摘要
香格里拉盆地地处滇藏地热带,具有形成热储、地热的基本条件。通过该区区域地质、物化探资料的分析研究,选择了盆地东北部为重点工作区,部署了超长电磁波探测、大地电磁测深、高精度磁测。初步查明了研究区寻找热储目标的重点应为受断裂影响的深埋藏碳酸盐岩储热储水层。总结出了香格里拉盆地6种类型的地频谱曲线,其中目标层——含水碳酸盐岩反映为E层曲线特征:较高振幅、基值高、波形活跃、变化幅度大。含水破碎灰岩电阻率100～200Ωm,与围岩存在明显电性差异。综合分析推测香格里拉县地热勘查靶区应在三村—达拉一带,富含水层深度1900～2600m,厚度约700m。
Xianggelila basin, situated in the geothermal area of Yunnan-Xizang is of basic conditions to form geothermal storage. Based on the data of regional geology and geo-physical and geo-chemical explorations, the northeast part of basin is chosen as the main studying area. The ultra-long electromagnetic wave method, magnetotelluric sounding and high-precision magnetic survey are arranged. It is preliminarily found out that for looking after geothermal storage, the target should be the thermal aquifer in the deep buried carbonate rock layers which is affected by faults. Six frequency response curves in Xianggelila basin are summed up. And one of the target-carbonate rock layer reacts as the features of E-layer curve, i.e. higher amplitude, high base price, enliven wave, big change. The resistivity of the water-contained broken limestone is 100~200Ωm, which is of remarkable difference with wall rocks. According to synthetic analysis, it is estimated that the thermal storage prospecting target region should be from Sancun to Lada and the surrounding area, and the depth of the water enriched aquifer should be 1900m to 2600m with the thickness to be 700m.
出处
《中国岩溶》
CAS
CSCD
2004年第3期187-195,共9页
Carsologica Sinica
关键词
香格里拉盆地
地热资源
物理勘探
云南
Xianggelila basin
Geothermal resource prospecting
Geophysical prospecting method
