Deep Seismic sounding in the Godavari Graben and Godavari (coastal) Basin, India

Kaila, K. L.; Murty, P.R.K.; Rao, V. K.; Venkateswarlu, N.

doi:10.1016/0040-1951(90)90226-x

Cited by 61 publications

(20 citation statements)

References 5 publications

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“…The Godavari graben was investigated by two DSS profiles, Kallur‐Polavaram and Polancha‐Narsapur across and along the graben, respectively. The 2‐D cross sections showed a rather flat Moho at 42 km depth, with crustal velocities increasing with depth from 6.3 to 6.9 km/s and sub‐Moho velocities around 8.1 km/s [ Kaila et al , 1990]. …”

Section: Geology and Crustal Structurementioning

confidence: 99%

“…The velocity‐depth profile obtained at this station suggests a 40 km thick crust, which agrees well with the 38 km reported by Jagadeesh and Rai [2008] for ADL. Velocity‐depth profiles obtained from DSS data [ Kaila et al , 1990] show a rather flat Moho at 41–43 km depth underlain by Pn velocities of 8.1 km/s, and upper, middle, and lower crusts of 6.3–6.5, 6.6–6.65, and 6.8–6.9 km/s, respectively, with intracrustal discontinuities at ∼20 and ∼30 km depth. Our velocity‐depth profile suggests a crust consisting of an upper layer of ∼3.4 km/s down to 10 km depth, 3.75 km/s down to 28 km depth, and ∼4.1 km/s down to Moho depths (Table 2), which correlates well with the velocity‐depth profile inferred from the DSS data.…”

Section: Crustal Structure Variationmentioning

confidence: 99%

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Deep crustal structure of the Indian shield from joint inversion of P wave receiver functions and Rayleigh wave group velocities: Implications for Precambrian crustal evolution

Julià¹,

Jagadeesh²,

S.³

et al. 2009

J. Geophys. Res.

108

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[1] The S wave velocity structure of the crust and uppermost mantle of the Indian shield has been investigated by jointly inverting P wave receiver functions and Rayleigh wave group velocities at 38 broadband stations in the subcontinent. The Indian shield is an amalgamation of several terranes of Archean and Proterozoic age that were partly flooded by Deccan Trap volcanism during Cenozoic times and that make up a natural laboratory for assessing models of Precambrian crustal evolution. Our results reveal significant variations in crustal thickness and deep crustal velocities: 45-50 km thick under the Archean West Dharwar craton and Southern Granulite Terrane, with lower crustal velocities around 4.1 km/s; 32 -35 km thick beneath the Archean East Dharwar and Bundelkhand cratons, with lower crustal velocities around 3.8-3.9 km/s; 50-65 km thick under the Proterozoic Bhandara craton, with lower crustal velocities around 4.2-4.3 km/s; and $55 km thick under the Proterozoic Aravalli-Delhi belt, with lower crustal velocities around 4.2 km/s. S velocities in the 4.1-4.3 km/s range in the deep crust can be attributed to mafic lithologies, suggesting there has been no secular change in the Precambrian evolution of the south Indian shield. Moreover, pervasive mafic dike swarming throughout the Indian shield suggests that the layer of mafic cumulates is 2.5-1.6 Ga old and that it delaminated from some Archean terranes. Our interpretation is that mafic underplating of the terranes making up the Indian shield occurred in Proterozoic times and that a refractory root developed under the Archean terranes after the Proterozoic event.Citation: Julià, J., S. Jagadeesh, S. S. Rai, and T. J. Owens (2009), Deep crustal structure of the Indian shield from joint inversion of P wave receiver functions and Rayleigh wave group velocities: Implications for Precambrian crustal evolution,

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Section: Geology and Crustal Structurementioning

confidence: 99%

Section: Crustal Structure Variationmentioning

confidence: 99%

Deep crustal structure of the Indian shield from joint inversion of P wave receiver functions and Rayleigh wave group velocities: Implications for Precambrian crustal evolution

Julià¹,

Jagadeesh²,

S.³

et al. 2009

J. Geophys. Res.

108

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“…It contains the rocks from Cretaceous to Tertiary, different rock types are sand, sandstone, mudstone, shale, clay, siltstone, silt, volcanic and limestone (IHS 2005). The Godavari Graben is filled with a maximum of 2.8-km-thick Early Gondwana (Late Permian to Early Triassic) sediments (Kaila et al 2005). In between these horst structures, three sub-basins are, namely, Krishna, West Godavari and the East Godavari.…”

Section: Introductionmentioning

confidence: 99%

Source rock analysis, thermal maturation and hydrocarbon generation using rock-eval pyrolysis in parts of Krishna–Godavari basin, India: a case study

Ramachandran

Babu

Behera

et al. 2012

J Petrol Explor Prod Technol

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Among the various techniques available, the geochemical technique involving total organic carbon content (TOC) and rock-eval pyrolysis are regularly being used in hydrocarbon exploration. They provide information on the kerogen type, sedimentary environment, effective source rock identification and its thermal maturity. In the present study, core samples from three deep boreholes in Krishna-Godavari basin are analyzed to understand the hydrocarbon scenario in parts of the basin. Based on TOC and rock-eval pyrolysis significantly thick, indigenous immature to early mature gas-prone shales from borehole GERMI #1; while non-indigenous, early mature to mature oil and gas-prone shales from borehole GERMI #2 and GERMI #3. Interpreted hydrocarbon typing is supported by well-testing analysis. Break in vitrinite reflectance (R o ) profile is also observed; indicative of significant erosion during Late Cretaceous sedimentation due to tectonic uplift during this time and associated high heat flow causes for thermal maturation of overlying units.

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“…This basin is located on a paleosuture between the Dharwar and the Bastar proto-cratons (Biswas, 2003) and is divided into three sub-basins, namely Chintalpudi, Godavari and Coastal sub-basin. Seismic studies across the Chintalpudi sub-basin delineated several basement ridges and depressions and provided a Moho depth of 40 km (Kaila et al 1990). The Gondwana sedimentation seems to have deposited on block-faulted Proterozoic basins that evolved due to repeated sagging along SW and NE Stratigraphic nomenclature for the PG Gondwana basin has been defined using different nomenclature.…”

Section: Introductionmentioning

confidence: 99%

Light Hydrocarbons Geochemistry of Surface Sediments from Pranhita-Godavari Basin, Andhra Pradesh

Radha

Rasheed

Rao

et al. 2011

Journal of the Geological Society of India

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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 (CH 4 ), ethane (C 2 H 6 ) and propane (C 3 H 8 ) in Gas chromatograph. Compound specific Carbon isotope ratios for CH 4 and C 2 H 6 were also determined using GC-C IRMS (Gas Chromatograph Combustion Isotope Mass Spectrometer). The presence of moderate to low concentrations of methane (C CH 4 : 1 to 138 ppb), ethane (C C 2 H 6 : 1 to 35 ppb) and propane (C C 3 H 8 : 1 to 20 ppb) was measured in the soil samples. Carbon isotopic composition of δ 13 C CH 4 ranges between -27.9 to -47.1 ‰ and δ 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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Deep Seismic sounding in the Godavari Graben and Godavari (coastal) Basin, India

Cited by 61 publications

References 5 publications

Deep crustal structure of the Indian shield from joint inversion of P wave receiver functions and Rayleigh wave group velocities: Implications for Precambrian crustal evolution

Deep crustal structure of the Indian shield from joint inversion of P wave receiver functions and Rayleigh wave group velocities: Implications for Precambrian crustal evolution

Source rock analysis, thermal maturation and hydrocarbon generation using rock-eval pyrolysis in parts of Krishna–Godavari basin, India: a case study

Light Hydrocarbons Geochemistry of Surface Sediments from Pranhita-Godavari Basin, Andhra Pradesh

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