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Kalpana, M. S.
- Near Surface Manifestation of Hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to Hydrocarbon Resource Potential
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Authors
Affiliations
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 606, IN
2 Directorate General of Hydrocarbons, Noida - 201 301, IN
1 National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad - 500 606, IN
2 Directorate General of Hydrocarbons, Noida - 201 301, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 548-556Abstract
Reconnaissance surface geochemical survey for adsorbed soil gas analysis conducted in Proterozoic Bhima and Kaladgi Basins, have revealed occurrence of anomalous concentrations of light gaseous hydrocarbons i.e. C1 to C4 (CH4, C2H6, C3H8, i-C4H10 and n-C4H10) in the near surface soils. The concentrations of C1 and ΣC2+(C2H6+C3H8+ i-C4H10+ n-C4H10) in Bhima and Kaladgi Basins are in the range of 1-2594 ppb and 1 to 57 ppb and 1-1142 ppb and 1-490 ppb, respectively. The carbon isotopic data of adsorbed soil gas methane in few selected samples are in the range of -29.9 to -39‰ (PDB). The evaluation of adsorbed soil gas data indicates that all the gas components are cogenetic and hydrocarbon ratios of C1/(C2+C3) < 10 and C3/C1*1000 between 60-500 and 20-60 suggest that the adsorbed gases are derived from oil and gas-condensate zones. The carbon isotopic values of methane further support thermogenic origin of these migrated gases. The concentration distribution of C1 and ΣC2+ in the study areas illustrate C1 and ΣC2+ anomalies near Katamadevarhalli, Andola and Talikota in Bhima Basin and near Kaladgi, Lokapur and north of Mudhol in Kaladgi Basin. The hydrocarbon anomalies near the surface coincide with the favourable subsurface structural features and correlate with existing geochemical and geophysical data in these basins suggesting seepage related anomalies.Keywords
Proterozoic, Adsorbed Soil Gas, Light Gaseous Hydrocarbons, Carbon Isotopes, Thermogenic, Bhima, Kaladgi.
- Light Hydrocarbons Geochemistry of Surface Sediments from Pranhita-Godavari Basin, Andhra Pradesh
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Authors
Affiliations
1 Stable Isotope and Surface Geochemical Prospecting of Hydrocarbon, National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad – 500 606, IN
1 Stable Isotope and Surface Geochemical Prospecting of Hydrocarbon, National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad – 500 606, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 477-483Abstract
A geochemical study of surface sediments from Pranhita-Godavari Basin, Andhra Pradesh, India was carried out using light hydrocarbon compounds to assess the hydrocarbon potential of the basin. Suite of 80 soil samples were collected from the depth of 2.5 m and analyzed for adsorbed light gaseous hydrocarbons namely methane (CH4), ethane (C2H6) and propane (C3H8) in Gas chromatograph. Compound specific Carbon isotope ratios for CH4 and C2H6 were also determined using GC-C IRMS (Gas Chromatograph Combustion Isotope Mass Spectrometer). The presence of moderate to low concentrations of methane (CCH4: 1 to 138 ppb), ethane (CC2H6: 1 to 35 ppb) and propane (CC3H8: 1 to 20 ppb) was measured in the soil samples. Carbon isotopic composition of δ13CCH4 ranges between -27.9 to -47.1 ‰ and δ13CC2H6 ranged between -36.9 to -37.2 ‰ (V-PDB) indicating that these gases are of thermogenic origin. Study of soil samples suggests the area has good potential for hydrocarbon.Keywords
Soil Gas, Light Hydrocarbons, Carbon Isotopes, Pranhita-Godavari Basin, Andhra Pradesh.References
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- KALPANA, G., MADHAVI, T., PATIL, D.J., DAYAL, A.M. and RAJU, S.V. (2010a) Light gaseous hydrocarbon anomalies in the near surface soils of Proterozoic Cuddapah Basin: Implication for hydrocarbon prospects. Jour. Petrol. Sci. Engg. v.73, pp.161-170.
- KALPANA, M.S., PATIL, D.J., DAYAL, A.M. and RAJU, S.V. (2010b) Near Surface Manifestation of Hydrocarbon in Proterozoic Bhima and Kaladgi Basins: Implication to hydrocarbon Resource potential. Jour. Geol. Soc. India, v.76, pp.548-556.
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- Geo-Microbial Prospecting Studies of Surface Sediments from Petroliferous Region of the Mehsana Block, North Cambay Basin
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Authors
M. A. Rasheed
1,
M. Veena Prasanna
1,
M. Lakshmi
1,
T. Madhavi
1,
M. S. Kalpana
1,
D. J. Patil
1,
A. M. Dayal
1
Affiliations
1 Microbiology Laboratory, CSIR-National Geophysical Research Institute, Hyderabad - 500 606, IN
1 Microbiology Laboratory, CSIR-National Geophysical Research Institute, Hyderabad - 500 606, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 267-275Abstract
Surface adsorbed gas surveys and geo-microbiological surveys are well known techniques of petroleum exploration and aim towards risk reduction in exploration by way of identifying the areas warm with hydrocarbons and to establish inter-se exploration priorities amongst the identified warm areas. The thermogenic surface adsorbed gaseous hydrocarbons distribution patterns in petroliferous areas are considered to be a credible evidence for the upward migration of hydrocarbons. The present investigation aims to explore correlation between the adsorbed gas distribution pattern and microbial oxidizers in identifying the upward migration of hydrocarbons especially in the tropical black soil terrain of known petroliferous Mehsana Block of North Cambay Basin, India. A set of 135 sub-soil samples collected, were analyzed for indicator hydrocarbon oxidizing bacteria, adsorbed light gaseous hydrocarbons and carbon isotope ratios (δ 13Cmethane and δ13Cethane). The microbial prospecting studies showed the presence of high bacterial population for methane (5.4 × 106 cfu/gm), ethane (5.5 × 106 cfu/gm), propane (4.6 × 106 cfu/gm) and butane oxidizing bacteria (4.6 × 106 cfu/gm) in soil samples. The light gaseous hydrocarbon analysis showed that the concentration ranges of C1, C2, C3, iC4 and nC4 are 402 ppb, 135 ppb, 70 ppb, 9 ppb and 18 ppb, respectively, and the value of carbon isotope ranges of methane -29.5 to -43.0‰ (V-PDB) and ethane -19.1 to -20.9‰ (V-PDB). The existence of un-altered petroliferous microseep (δ13C, -43‰) of catagenetic origin is observed in the study area. Geo-microbial prospecting method and adsorbed soil gas and carbon isotope studies have shown good correlation with existing oil/gas fields of Mehsana. Microbial surveys can independently precede other geochemical and geophysical surveys to delineate area warm with hydrocarbons, and mapped microbiological anomalies may provide focus for locales of hydrocarbon accumulation in the Mehsana Block of Cambay Basin.Keywords
Geo-Mirobial Prospecting, Adsorbed Soil Gas, Light Hydrocarbons, Carbon Isotopes, Cambay Basin.References
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