基于自然伽马能谱测井的临兴地区铝土岩生氦潜力评价

Helium-generating potential evaluation of bauxite in Linxing area based on natural gamma-ray spectral logging

为研究鄂尔多斯东缘临兴地区本溪组铝土岩生氦潜力,笔者采用自然伽马能谱测井方法进行了不同岩性生氦潜力研究。结果表明:火山岩物源和封闭的滨浅海沉积环境为研究区本溪组铝土岩提供了丰富的U、Th元素富集条件,本溪组铝土岩储层呈现超高自然伽马、高铀、高钍的测井特征。铝土层具有极高的生氦潜力,同时临近煤系地层产生的烃类气体可以作为载体,具有优良的形成含氦天然气藏的气源条件。本溪组铝土岩之上的致密砂岩具有良好的含气性,试气显示氦气含量为0.148%,具备工业开采价值。

To investigate the helium-generating potential of bauxite in the Benxi Formation of Linxing area in the eastern margin of Ordos Basin,the authors conducted a study on the helium-generating potential of different lithologies using the natural gamma-ray spectral logging method.The results indicate that the volcanic rock source and the closed coastal shallow marine sedimentary environment provide abundant enrichment conditions of U and Th for the bauxite of the Benxi Formation in the study area.The bauxite reservoirs of the Benxi Formation show the logging characteristics of ultra-high natural gamma,high U and high Th.The bauxite layer has very high helium-generating potential,while the hydrocarbon gas produced by adjacent coal formation can serve as effective carriers for forming helium-containing natural gas reservoirs.The tight sandstone above the bauxite of the Benxi Formation demonstrates good gas-bearing capacity,with gas tests showing a helium content of 0.148%,indicating industrial mining value.