Light hydrocarbons geochemistry of surface sediments from Pranhita-Godavari Basin,Andhra Pradesh |
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| Authors: | B Anu Radha M A Rasheed P L Srinivasa Rao M S Kalpana A M Dayal |
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| Institution: | (1) Petroleum Habitats, 806 Soboda Ct., Houston, Texas 77079, USA;(2) Worldwide Geochemistry, 218 Higgins Street, Humble, Texas 77338, USA |
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| Abstract: | 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 C_{CH_4 } : 1 to 138 ppb), ethane (H4{H_4 }: 1 to 35 ppb) and propane (CC3 H8 C_{C_3 H_8 } : 1 to 20 ppb) was measured in the soil samples. Carbon isotopic composition of d13 CCH4 \delta ^{13} C_{CH_4 } ranges between −27.9 to −47.1 ‰ and d13 CC2 H6 \delta ^{13} C_{C_2 H_6 } 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. |
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