Gravity signatures from features associated with the footprints of uranium deposits within the sandstones and basement of the Athabasca Basin are masked in the measured gravity by the contribution from glacial sediments (overburden), in particular by the variable thickness of the overburden. The 2D inversions of seismic refraction and gravity data are assessed as a means of reliably mapping overburden thickness, enabling the contribution to gravity from the overburden to be taken into account and density anomalies associated with deeper mineralization and alteration to be reconstructed through further inversion. Results show that independent inversion of seismic refraction data using the fuzzy c-means clustering method is able to determine the base of overburden well. Subsequent gravity inversion constrained by the overburden thickness reveals possible subtle density variations at depth, which could be associated with alteration in the sandstones associated with the uranium mineralization. Application of the seismic clustering inversion followed by constrained gravity inversion to both representative synthetic scenarios and real data from the Athabasca Basin, Canada, are considered. Drill-hole data show that the inversion results can predict the base of the overburden well, and there is an acceptable match between geologic information and possible alteration zones suggested by the inversions.

中文翻译：

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用于覆盖层剥离的地震折射和重力数据的聚类和约束反演：在加拿大阿萨巴斯卡盆地铀矿勘探中的应用

阿萨巴斯卡盆地的砂岩和地下室中与铀矿床脚印有关的地貌特征引起的重力特征在测量重力中被冰川沉积物（上覆岩）的贡献所掩盖，尤其是上覆岩层厚度的变化。地震折射和重力数据的二维反演被评估为可靠地绘制覆盖层厚度的一种手段，能够考虑到覆盖层对重力的贡献，并且可以通过进一步反演来重建与深部矿化和蚀变有关的密度异常。结果表明，采用模糊c均值聚类方法对地震折射数据进行独立反演能够确定覆盖层的基础。随后受覆盖层厚度限制的重力反演揭示了深度上可能的细微密度变化，这可能与与铀矿化有关的砂岩的变化有关。考虑了将地震聚类反演和约束重力反演应用于代表性的合成情景和加拿大阿萨巴斯卡盆地的真实数据。钻孔数据表明，反演结果可以预测覆盖层井的基础，并且地质信息与反演建议的可能的蚀变带之间存在可接受的匹配。考虑了将地震聚类反演和约束重力反演应用于代表性的合成情景和加拿大阿萨巴斯卡盆地的真实数据。钻孔数据表明，反演结果可以预测覆盖层井的基础，并且地质信息与反演建议的可能的蚀变带之间存在可接受的匹配。考虑了将地震聚类反演和约束重力反演应用于代表性的合成情景和加拿大阿萨巴斯卡盆地的真实数据。钻孔数据表明，反演结果可以预测覆盖层井的基础，并且地质信息与反演建议的可能的蚀变带之间存在可接受的匹配。