Light hydrocarbons geochemistry of surface sediment from petroliferous region of the Mehsana block, North Cambay Basin

Madhavi, T.; Kumar, T. V. Vijay; Rasheed, Mohammed Abdul; Kalpana, G.; Patil, D. J.; Dayal, A. M.

doi:10.1007/s12594-009-0092-y

Cited by 19 publications

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“…A recent study reported by Madhavi et al (2009) to assess the efficacy of surface geochemical methods as exploration tool in petroliferous region of the Mehsana block, North Cambay Basin have shown good correlation of surface geochemical anomalies with the major generative depressions of oil and/or gas field of Sobhasan/Linch areas. Therefore, adsorbed soil gas surveys are considered to be rapid and cost effective for initial evaluation of frontier basins.…”

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Near surface manifestation of hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to hydrocarbon resource potential

et al. 2010

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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. C 1 to C 4 (CH 4 , C 2 H 6, C 3 H 8, i-C 4 H 10 and n-C 4 H 10 ) in the near surface soils. The concentrations of C 1 and 6C 2+ (C 2 H 6 +C 3 H 8 + i-C 4 H 10 + n-C 4 H 10 ) 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 C 1 /(C 2 +C 3 ) < 10 and C 3 /C 1 *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 C 1 and 6C 2+ in the study areas illustrate C 1 and 6C 2+ 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.

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Near surface manifestation of hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to hydrocarbon resource potential

et al. 2010

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“…The C 1 , C 2 , C 3 , nC 4 , iC 4 and C 2+ show linear relationship among themselves, suggesting that all the hydrocarbon constituents in microseep are genetically related and least influenced by secondary alterations during migration of microseeps from the sub surface to the surface and their subsequent adsorption on the soils. The carbon isotopic data of methane and ethane indicates thermogenic source for the adsorbed soil gases (Madhavi et al, 2009). The thermogenic origin of these hydrocarbons is further confirmed by absence of correlation between ΣC 2+ and TOC (Total organic carbon) and TIC (Total inorganic carbon) content in the soil samples.…”

Section: Discussionmentioning

confidence: 71%

“…The 0.5 ml of the gas was injected in to the Varian CP-3380 Gas chromatograph equipped with Flame ionization detector for quantification of light hydrocarbons. Carbon isotopic composition of light hydrocarbons (δ 13 C 1 and δ 13 C 2 ) in soil samples is determined using GC-C-IRMS, which comprises of Agilent 6890 GC coupled to a Finnigan-Delta Plus XP Isotope Ratio Mass Spectrometer via a GC combustion III interface (Madhavi et al, 2009). The TOC and TIC were measured by Elementar Liqui TOC analyzer with the solid sample module.…”

Section: Sampling and Laboratory Workmentioning

confidence: 99%

“…The concentration of Methane varied from 1-402 ppb, Ethane from 1-135 ppb, Propane from 1-70 ppb, and i-Butane from 1-9 ppb, n-Butane from 1-18 ppb. The carbon isotopic ratios of methane and ethane ranged from -29.5 to -43.0‰ (PDB) and -19.1 to -20.9‰ (PDB) respectively (Madhavi et al, 2009). The anomaly map of ΣC 2+ hydrocarbons (C 2 + C 3 + iC 4 + nC 4 ) is given in Figure 2, by considering mean plus half standard deviation as background and values above this are considered to be anomalous.…”

Section: Light Gaseous Hydrocarbon Compositions and Carbon Isotopic Datamentioning

confidence: 99%

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Evidence for a relationship between hydrocarbon microseepage and trace metal anomalies: an implication for petroleum exploration

et al. 2011

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The paper reports the role of hydrocarbon microseepage in surface alterations of trace metal concentrations. In this study trace metal alterations were mapped that appear to be associated with hydrocarbon microseepages in the oil/gas fields of Mehsana block, North Cambay basin, India. The ranges of adsorbed soil gas concentrations of Methane, Ethane, Propane, iButane and n-Butane are found to vary from 1-402 ppb, 1-135 ppb, 1-70 ppb, 1-9 ppb, 1-18 ppb respectively, suggesting the presence of hydrocarbons and microseepage associated with the study area. The carbon isotopic signature of methane ranged from -29.5 to -43.0‰ (PDB) and ethane from -19.1 to -20.9‰ (PDB), indicating a thermogenic source of hydrocarbons. The absence of any significant correlation of Total Organic Carbon (TOC) and Total Inorganic Carbon (TIC) (r = 0.1 and 0.5 respectively) content with hydrocarbons in soil samples demonstrates the catagenetic origin of the desorbed gases. The Trace metal concentrations varied in the following manner: Ni: 49-155 ppm, V: 67-158 ppm, Cu: 29-82 ppm, Zn: 64-327 ppm, Ba: 241-554 ppm and Sr: 118-892 ppm. These high concentrations of trace metals which are more than their respective average concentrations generally found in soils are indicative of hydrocarbon induced alterations in the area.The low Eh values observed in anomalous hydrocarbon bearing soil samples compared to non anomalous samples in the area, could be attributed to the reducing conditions created by the hydrocarbon seepage from subsurface and might have influenced the trace metal solubilities which is reflected in their increased concentrations. Trace metal anomalies are seen haloed to adsorbed soil gas anomalies (ΣC 2+ ) indicating that the major generative depressions of oil and /or gas fields of Sobhasan / Linch in the study area promoted vertical migration of hydrocarbon microbubbles which in turn facilitated trace metal deposition in the surface soils. By using integrated method approach, the weak signal of oil and gas reservoirs could be amplified in the frontier areas and the uncertainity of the vertical correlation of surface anomalies could be reduced.

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“…Most studies on organic geochemical exploration concern the analysis of light gaseous hydrocarbons in recent sediments because these compounds migrate easier than the heavier, liquid hydrocarbons 7 . Hydrocarbons reaching the surface can be measured directly both in the sediments and in the overlying air or water 2,[7][8][9][10][11][12] . The anomalous concentrations of hydrocarbon gases like methane, ethane and propane in surface soils serve as direct evidence for the presence of a petroleum system in and around the area 2,13 .…”

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Recognition of Hydrocarbon Microseepage Using Microbial and Adsorbed Soil Gas Indicators in the Petroliferous Region of Krishna-Godavari Basin, India

et al. 2017

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The present study aims at exploring the possible correlation between adsorbed light gaseous hydrocarbon distribution pattern and the hydrocarbon oxidizing microbes present in the sub-soil samples. To establish the role of the latter in identifying the upward migration of hydrocarbons, especially a known petroliferous Krishna-Godavari Basin has been investigated. Soil samples from oil and gas fields of Tatipaka

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Light hydrocarbons geochemistry of surface sediment from petroliferous region of the Mehsana block, North Cambay Basin

Cited by 19 publications

References 13 publications

Near surface manifestation of hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to hydrocarbon resource potential

Near surface manifestation of hydrocarbons in Proterozoic Bhima and Kaladgi Basins: Implications to hydrocarbon resource potential

Evidence for a relationship between hydrocarbon microseepage and trace metal anomalies: an implication for petroleum exploration

Recognition of Hydrocarbon Microseepage Using Microbial and Adsorbed Soil Gas Indicators in the Petroliferous Region of Krishna-Godavari Basin, India

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