Stratigraphy of Barail Series in Southern Part of Shillong Plateau, Assam, India: GEOLOGICAL NOTES

Baksi, Subhendu Kumar

doi:10.1306/a6633890-16c0-11d7-8645000102c1865d

Cited by 2 publications

References 2 publications

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Characterization of complex fluvial-deltaic deposits in Northeast India using Poisson impedance inversion and non-parametric statistical technique

Mahadasu

Ambati

Nair

2022

Sci Rep

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Characterizing complex fluvial-deltaic deposits is a challenging task for finding hydrocarbon discoveries. We described a methodology for predicting the hydrocarbon zones from complex well-log and prestack seismic data. In this current study, data analysis involves an integrated framework based on Simultaneous prestack seismic inversion (SPSI), target correlation coefficient analysis (TCCA), Poisson impedance inversion, and non-parametric statistical analysis, and Bayesian classification. First, seismic elastic attributes from prestack seismic data were estimated. They can provide the spatial distribution of petrophysical properties of seismic data. Then target correlation coefficient analysis (TCCA) was estimated roration factor “c” from well-log data. Using the seismic elastic attributes and rotation factor “c”, Poisson impedance inversion was performed to predict the Poisson impedance volume. Finally, Bayesian classification integrated the Poisson impedance volume with non-parametric probabilistic density functions (PDFs) to estimate the spatial distribution of lithofacies. Despite complex characteristics in the elastic properties, the current study successfully delineated the complex fluvial-details deposits. These results were verified with conventional findings through numerical analysis.

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Characterization of complex fluvial-deltaic deposits in Northeast India using Poisson impedance inversion and non-parametric statistical technique

Mahadasu

Ambati

Nair

2022

Sci Rep

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Microfossil assemblages from the Eocene Sylhet Limestone and Kopili Formation, Sylhet District, northeast Bangladesh

Brouwers¹,

Khan²,

Akhtar³

1992

Open-File Report

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The Sylhet Limestone and the Kopili Formation in northeastern Bangladesh, of middle and late middle to late Eocene age, respectively, contain abundant microfossil faunas. The Sylhet Limestone, known regionally as the "Nummulitic Limestone", includes an abundant and diverse larger foraminifer assemblage, a moderately diverse smaller benthic foraminifer assemblage, and a sparse, low diversity ostracode assemblage. The Sylhet Limestone can be correlated with other middle Eocene formations on the basis of the larger foraminifers (Nummulites, Assilina, Discocyclina, and Alveolina). The Kopili Formation contains diverse larger foraminifer and smaller benthic foraminifer assemblages, a fairly diverse planktic foraminifer assemblage, and a sparse ostracode assemblage. The fauna of the Kopili Formation can be correlated with other late Eocene faunas on the basis of the larger foraminifers (Nummulites, Pellatispira) and planktic foraminifer species (Globorotalia, Hantkenina). The foraminifer assemblage has greater zoogeographic affinities with Eocene Indopacific assemblages than the ostracode assemblages; the ostracodes show affinities with Eocene Tethyan faunas from the Middle East. Microfossil assemblages of the Sylhet Limestone and Kopili Formation change in composition upsection in response to the shoaling trend that occurred in this region.

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Stratigraphy of Barail Series in Southern Part of Shillong Plateau, Assam, India: GEOLOGICAL NOTES

Cited by 2 publications

References 2 publications

Characterization of complex fluvial-deltaic deposits in Northeast India using Poisson impedance inversion and non-parametric statistical technique

Characterization of complex fluvial-deltaic deposits in Northeast India using Poisson impedance inversion and non-parametric statistical technique

Microfossil assemblages from the Eocene Sylhet Limestone and Kopili Formation, Sylhet District, northeast Bangladesh

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