东北漠河盆地北部冻土分布特征

漠河盆地具有良好的天然气水合物成藏前景,了解盆地内冻土发育状况对评价水合物资源潜力和有利区优选十分重要.在东北漠河地区开展音频大地电磁测深(AMT)的剖面测量工作,目的之一是查明工区内冻土层埋深厚度以及空间分布.本文通过对东北漠河盆地北部冻土层电性特征的分析,依据冻土层的高阻特性进行了厚度识别和划分,勘探结果显示,漠河盆地北部冻土呈岛状分布,冻土分布特点为北厚南薄,西部薄,中东部厚,最大厚度为120m,平均厚度40~ 80m,反映了该区具有形成天然气水合物良好的冻土条件.

Permafrost distribution characteristics of northern Mohe basis in Northeast China

Mohe basin has favorable reservoir-forming prospect for gas hydrate,and the understanding of the permafrost development situation in the basin is very important for evaluation of gas hydrate resources potential and optimization of favorable areas.One of the purposes of carrying out audio frequency magnetotelluric sounding profile measurement in Mohe area of Northeast China is to find out the buried depth and spatial distribution of permafrost in the working area.Based on an analysis of the electrical property characteristics and high resistivity features of the permafrost,the authors made thickness recognition and division.The exploration results show that the permafrost in northern Mohe basin exhibits island-shaped distribution,with characteristics of thick in the north and thin in the south,thin in the west and thick in central and east parts,with the maximum thickness being 120m and the average thickness being 40~80,which demonstrates that the study area has favorable permafrost conditions for the formation of gas hydrate resources.