B Ghosh, AE Pillay, SS Kundu, B Senthilmurugan and S Stephen
Keywords: Diagenesis, laser ablation, ICP-MS, mineral-deposition, carbonate-rock.
Abstract: Laser depth-profiling is a valuable tool for unraveling the complexities of subterranean diagenetic processes and postdepositional change associated with carbonate reservoirs. Core fragments were subjected to high-performance ICP-MS laser irradiation (213nm) at several ablation points to depths of 50?m at 10?m intervals. The method is convenient and adequately competent to study diagenetic phenomena of carbonates. It is capable of estimating the dimensions of pore spaces and grain-size distribution in carbonate reservoir rock and shedding light on sedimentary dolomitic-limestone trends within the matrix. Spectral evidence of secondary deposition and co-habitation of strontium and iron due to secondary fluid inclusions was observed at matrix grain boundaries. The application was successful in exploring the internal microstructure of carbonate cores and providing clues linked to certain aspects of pore sizes. The study is of relevance to geologists, reservoir engineers and petro-physicists and can be useful in geostatistical modeling and simulation.
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