Application of natural thermoluminescence measurement technique in natural gas hydrate exploration in permafrost areas
Since natural gas hydrates(NGHs)in permafrost areas feature complex formation mechanisms and multiple sources,there is an urgent need to develop multiple techniques for micro-leakage information capture in order to increase the exploration success rate.This study applied the natural thermoluminescence measurement technique to NGH exploration in a permafrost area for the first time.Specifically,it tested the thermoluminescence intensity in soil samples from the Muli permafrost area of the Qilian Mountains using an RGD-6 thermoluminescent dosimeter.Then,it summarized the heating procedure for NGH exploration in the area,as well as size frac-tions for sampling.The results show that the soil samples from the Muli permafrost area demonstrated optimal size fractions for sampling ranging from-60～100 meshes,an optimal heating rate of 5℃/s,and an optimal heating range of 50～400℃.Based on the anomaly characteristics of the natural thermoluminescence intensity in soil samples,this study determined the anomaly boundary of NGHs on the surface of the permafrost area.It revealed that the natural thermoluminescence intensity displayed anomalies on the top,which corre-spond well to the hydrocarbon anomaly mode.The natural thermoluminescence measurements of soil,unaffected by microorganisms and boasting high sensitivity,can be popularized as a promising method for NGH explorations in permafrost areas.
natural thermoluminescencesize fractiontemperaturenatural gas hydrate(NGH)permafrost areaQilian Mountains
万方数据
维普
