⁵⁷Fe Mössbauer Spectroscopic Study of Sedimentary Samples from Goru Formation in Well MNW-1 of Jaisalmer Basin, Rajasthan, India

Samay Singh Meena, Sahi Ram*, Beena Bhatia, and R.P. Tripathi

Department of Physics, Jai Narain Vyas University,

Jodhpur-342005, India

*Corresponding author: sr_–panwar@yahoo.co.in

The test well MNW-1 is located in the Manewala structure of Jaisalmer basin. The Cretaceous sediments are believed to contain source rocks in this basin, the samples collected from Goru formation of upper Cretaceous sedimentary sequence were investigated using Mössbauer spectroscopy to understand the relative distribution of iron bearing minerals with depth.

Iron was found present mainly in siderite, Fe²⁺ in clay minerals and Fe³⁺ in clay minerals. Large abundance of Fe³⁺ in clay minerals in comparison Fe²⁺ in clay minerals results into lower ferrous to ferric ratio in this Formation. This is an indication of poor reducing environment which is not favorable for transformation of organic matter into hydrocarbons.

Keywords: Source rocks, Mössbauer spectroscopy, Iron bearing minerals.

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