摘要:
为了配合东北冻土区天然气水合物资源勘查工作,在东北漠河盆地北部开展了音频大地电磁测深工作.文中通过对音频大地电磁测深的二维地电断面解释结果与平面电阻率特征的对比分析,进行了电性单元和断裂的划分,并对地质上漠河盆地滨海隆起区西北部“一隆一凹”的构造格局进行了完善,形成了“两隆两凹,隆凹相间”的地质构造格局,初步查明了区域断裂构造的空间分布特征,其中F2、F4、F8断裂是次一级构造格局形成的控制性断裂,并结合地层的物性参数、冻土层分布厚度对天然气水合物成藏的有利条件进行了分析,提出北红村以南,即电性单元③为天然气水合物成藏的有利地区.
Abstract:
For the purpose of supporting gas hydrate resources exploration,audio frequency magnetotelluric sounding was carried out in the northern part of Mohe basin in Northeast China.Through a comparative analysis of two-dimensional geoelectrical section interpretation result of audio frequency magnetotelluric sounding and planar resistivity characteristics,the authors conducted division of electrical property units and faults,and perfected "one uplift and one depression" structural framework in northwestern littoral uplift area of Mohe basis,thus forming geological-structural framework of "two uplifts and two depressions,alternate uplift and depression".Spatial distribution characteristics of regional faulted structure were preliminarily found out;F2,F4 and Fs faults somewhat control the secondary structural framework.In combination with physical character of strata and thickness of permafrost distribution,the authors made an analysis of the favorable conditions for the formation of gas hydrate reservoirs and pointed out that the area to the south of Beihongcun,i.e.,electrical property unit ③ is favorable for the formation of gas hydrate reservoirs.
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