In Cambay basin (India) a thick sedimentary sequence exits consisting of shales. This sequence is known as Cambay Shale Formation (both younger and older). In the present investigation 57Fe Mössbauer spectroscopy study was carried on samples of Cambay Shale Formation. These samples are collected from various depth interval from well UBER#2. Results thus obtained are also compared with the Mössbauer spectroscopic study already available on shale samples of (from Cambay Shale Formation) well K-263. It was found that samples from well UBER#2 show presence of iron mainly in clay forming minerals in Fe2+ state, but show no presence of pyrite or ferric sulphate minerals. In contrast sample studied from well K-263 show presence of iron mainly in pyrite and in ferric sulphate but iron clay minerals is absent in most of the samples. Implication of distribution of iron minerals in these wells is discussed in context of future shale oil and shale gas exploration from this basin.

中文翻译：

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在页岩气或页岩油背景下，Cambay 盆地 Cambay 页岩地层样品的穆斯堡尔光谱研究

在坎贝盆地（印度），存在由页岩组成的厚沉积层序。该层序被称为 Cambay 页岩组（包括更年轻的和更年长的）。在本次调查中，57Fe 穆斯堡尔光谱研究是在 Cambay 页岩地层样品上进行的。这些样本是从 UBER#2 井的不同深度间隔收集的。由此获得的结果也与 K-263 井（来自 Cambay 页岩组）的页岩样品的 Mössbauer 光谱研究进行了比较。发现来自 UBER#2 井的样品显示铁主要存在​​于 Fe2+ 状态的粘土形成矿物中，但没有显示出黄铁矿或硫酸铁矿物的存在。相比之下，从 K-263 井研究的样品显示铁主要存在​​于黄铁矿和硫酸铁中，但在大多数样品中不存在铁粘土矿物。