Carbon isotope geochemistry of petroleum-associated gases in Krishna-Godavari Basin, India

Banerjie, V.; Mittal, A.K.; Agarwal, K. K.; Uniyal, Aniruddha; Chandra, Kuldeep

doi:10.1016/0146-6380(94)90199-6

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…It occupies an area of 20 000−28 000 km 2 onshore and 13 000−24 000 km 2 offshore. The basin was formed from the Late Carboniferous to the Quaternary, resulting in sediment layers up to several kilometers thick. − The sediment in this study area exhibits a high clay content of 50−70%, a high cation-exchange capacity, and a pH in the 7.3−8.5 range. , Kaolinite, montmorillonite, and illite are the main clay minerals in these sediments. , There are multiple oil- and gas-bearing structures in this petroliferous region, and the estimated hydrocarbon reserves exceed 2 billion tons. , The gas is thermogenic from Permian coals and shales. , …”

Section: Introductionmentioning

confidence: 88%

Hydrate-Bearing Sediments from the Krishna−Godavari Basin: Physical Characterization, Pressure Core Testing, and Scaled Production Monitoring

Yun¹,

Fratta

Santamarina

2010

Energy Fuels

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Gas hydrate-bearing sediments recovered by pressure coring from the Krishna-Godavari Basin offshore India during the 2006 National Gas Hydrate Program (NGHP) expedition were characterized using the instrumented pressure testing chamber (IPTC). The IPTC studies provided longitudinal profiles of P-and S-wave velocities, electrical conductivity, and undrained penetration resistance. The formation consisted of fine-grained clayey sediments of high specific surface and high plasticity. X-ray images showed horizontal layering, pronounced heterogeneity from milli-to centimeter scales, with the presence of high-density nodules and both horizontal and sub-vertical gas hydrate lenses. Relative to reference values for sediments without hydrates, regions of high P-and S-wave velocities, low electrical conductivity, and high undrained shear strength were identified and correlated with regions of apparent high hydrate volume fractions in all tested specimens. Physical properties were monitored during the depressurization of pressure cores. The hydrate volume fraction was estimated to be 18.2%. The evolution of P-wave amplitude, electrical conductivity, and temperature showed gas generation and freshening upon phase transformation. The effect of sampling by pressure coring and the ensuing zero-effective stress condition were discussed.

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Section: Introductionmentioning

confidence: 88%

Hydrate-Bearing Sediments from the Krishna−Godavari Basin: Physical Characterization, Pressure Core Testing, and Scaled Production Monitoring

Yun¹,

Fratta

Santamarina

2010

Energy Fuels

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“…The sedimentary section in the Krishna-Godavari Basin is dominated by clay-rich sediments, with little evidence of significant input of coarser-grain sediments (Basu, 1990). Studies of conventional hydrocarbon systems in the Krishna-Godavari Basin have revealed that preserved organic matter in Paleocene and Cretaceous sedimentary section has led to the accumulation of significant conventional gas and gas-condensate fields in the basin (Banerjie et al, 1994). However, the gas hydrates sampled during NGHP-01 contain mostly methane derived from microbial sources (Collett et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Sampling disturbance in hydrate-bearing sediment pressure cores: NGHP-01 expedition, Krishna–Godavari Basin example

Dai

Santamarina

2014

Marine and Petroleum Geology

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Sampling natural sediments causes unavoidable disturbance as recovered sediments experience changes in stress and strain during drilling, core recovery, transportation, handling, and early stages of testing. In hydrate-bearing sediments, the potential for sampling disturbance may be aggravated, since pressure and temperature changes can lead to hydrate dissociation and gas exsolution. Pressure core technology attempts to recover and characterize hydrate-bearing sediments while preserving them under in situ pressure and temperature conditions, which is an essential requirement to assess the mechanical, physical, chemical, and biological properties of natural hydrate-bearing sediments. Previous studies on near-surface sampling effects are extended in this study to evaluate additional sampling disturbances relevant to hydrate-bearing sediments: (1) hydrate dissociation due to mechanical extension, (2) negative pore pressure generation during unloading (Mandel-Cryer effect), (3) secondary hydrate formation, (4) changes in hydrate mass as a function of changes in pressure and temperature within the stability field, (5) hydrate anomalous preservation and its benefits for pressure core handling and testing, and (6) relaxation/aging following sampling. Results provide valuable insight to sampler design, coring and operation procedures, high pressure chamber design, and pressure core testing techniques.

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Gas Hydrate Scenario in India

Sharma

Saxena

2019

Unconventional Resources in India: The Way Ahead

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Carbon isotope geochemistry of petroleum-associated gases in Krishna-Godavari Basin, India

Cited by 5 publications

References 3 publications

Hydrate-Bearing Sediments from the Krishna−Godavari Basin: Physical Characterization, Pressure Core Testing, and Scaled Production Monitoring

Hydrate-Bearing Sediments from the Krishna−Godavari Basin: Physical Characterization, Pressure Core Testing, and Scaled Production Monitoring

Sampling disturbance in hydrate-bearing sediment pressure cores: NGHP-01 expedition, Krishna–Godavari Basin example

Gas Hydrate Scenario in India

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