地震勘探在加拿大萨斯克彻温盆地洪堡(Humboldt)区钾盐矿勘探中的应用

Application of Seismic Prospecting in Humboldt Potash Ore Deposit Exploration,Saskatchewan Basin,Canada

加拿大萨斯喀彻温省洪堡(Humboldt)区位于萨斯喀彻温盆地中北部,属于世界在钾盐沉积盆地边缘部位。依据加拿大萨斯喀彻温省能源和资源部公布的地层对比图,采用地震勘探方法,建立了洪堡(Humboldt)区地震波组与地质界面的对应关系。根据该区钾盐矿层沉积在地震时间剖面所反映的波形特征,对钾盐矿的赋存范围进行了圈定,预测了矿层总体厚度变化趋势,并对影响矿层中的地质异常及分布特征进行了分析。认为矿区塌陷构造较为发育,且部分大型塌陷区与上部含水层具有良好的水力联系,存在较大的开发风险,建议在该地区开展钾盐开发应加大勘探投入。

The Humboldt district is situated in the mid-north part of Saskatchewan Basin,Saskatchewan Province,Canada,on the marginal position of world potash deposit distribution. According to strata correlation map released by the Ministry of Energy and Resources,Saskatchewan Province,Canada,through seismic prospecting has established correspondence between seismic wave groups and geological interfaces in Humboldt district. Based on the area＇s potash ore deposits reflected waveform features on seismic time sections carried out delineation of potash ore hosting range; predicted ore layers total thickness variation trend; analyzed impacting ore layer geological anomalies and distribution features. Considering the collapse structures in the ore area are rather developed,part of large collapsed area have good hydraulic connection with upper part aquifers,thus larger exploitation risks existed,so to exploit potash in the area,the investment in exploration should be increased.