Abstract
Shale gas characteristics of core shale samples from Middle Permian Barren Measures Formation have been assessed for this study. The samples were collected from Raniganj, West Bokaro and South Karanpura sub-basins within Damodar Valley Basin, eastern India. Organic geochemical characteristics such as total organic carbon content (TOC), type of organic matter and thermal maturity have been investigated using Rock-Eval pyrolysis. Biomarker analysis, using gas chromatography – mass spectrometry (GC-MS), has been performed in order to understand the source and depositional environment of organic matter. Pore space distribution and pore morphology are inferred from the images from field emission scanning electron microscopy (FE-SEM) and mineral identification as well as semi-quantitative mineralogy of the same has been analysed using X-ray diffraction analyses. The results show that the shale samples contain a mixture of Type-II and Type-III organic matter with oil to wet gas thermal maturity. The TOC values range from 2.66-9.38%. The biomarker data reveal that the organic matter is dominated by terrestrial higher plant input, deposited under sub-oxic environment. The FE-SEM images suggest intergranular mineral matrix pores to be the dominant pore type. The inorganic part to the shale is composed of quartz, micas, kaolinite, illite, feldspars and siderite.
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