000			01975nab a2200205 4500
005			20260520001850.0
008			260224s2010 xxu
245	0	0	_aLight gaseous hydrocarbon anomalies in the near surface soils of Proterozoic Cuddapah Basin: Implications for hydrocarbon prospects
260			_a _b _cago. 2010
270			_a20/09/2010 ; 20/09/2010
300			_a10 p. ; 161-170
520			_aTranscripción del resumen del autor. The Proterozoic Cuddapah Basin, South India is grouped under Category IV sedimentary basins of India by Directorate General of Hydrocarbons (DGH), India having possible existence of hydrocarbons. Reconnaissance surface geochemical survey for adsorbed soil gas analysis was conducted in Cuddapah Basin for initial evaluation of hydrocarbon resource potential of the basin. The gas chromatographic analyses of adsorbed soil gases show presence of C1 to C4 hydrocarbons. The scatter plots between C1 to C4 components depict linear trend indicating that all the gases are derived from the same source and the hydrocarbon ratios of C3/C1 1000 between 60–500 and 20–60 suggests thermogenic origin for these gases. Further, XRD analyses demonstrated increased presence of calcite in non-anomalous samples compared to anomalous samples and also lack of correlation between SC2+ and soil TIC-TOC indicates seepage related surface anomalies. An important observation from this study was that the distribution of SC2+ anomalies over Nandhyal and Koilkuntla coincide with the favorable subsurface structural features and thick sediment deposits (6000–9000 m) defined by geophysical methods in these areas, signifying the potential for hydrocarbon generation and entrapment in the basin.
581			_a1-2
773	0		_tJournal of Petroleum Science & Engineering _g73
942			_cARTICULO
100	1		_aKalpana, G. _946894
100	1		_aMadhavi, T. _946895
100	1		_aPatil, D.J. _946896
999			_c177005 _d177005