Structural controls on topography and river morphodynamics in Upper Assam Valley, India

Borgohain, Susanta; Das, Jayanta; Saraf, A. K.; Singh, Gaurav; Baral, S.S.

doi:10.1080/09853111.2017.1313090

Cited by 16 publications

(4 citation statements)

References 21 publications

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“…The basin evolved as a passive margin platform with a history of the extension and normal faulting (Kent & Dasgupta, 2004; Mathur et al, 2001; Murty, 1984). The convergence of the Indian Plate and the Eurasian Plate, along with the collision by the Burmese Plate, endorsed intense flexure and complex structure in the central basement of the Upper Assam Basin, generating several basement highs and lows (Borgohain et al, 2017; Kumar et al, 2023) (Figure 1). The basin got structured by numerous fault blocks during the Eocene phase and witnessed the development of south‐east dipping shelf.…”

Section: Discussionmentioning

confidence: 99%

Appraisal of reservoir porosity using a machine learning approach: A study from the Eocene‐Miocene interval of Upper Assam Basin, NE, India

Kumar,

Sain

2023

Geological Journal

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Porosity estimation is essential for the exploration of hydrocarbons in sedimentary basins, which are affected by several factors such as the burial depth, lithology changes, sedimentary environment and diagenetic degree. Hence, detailed understanding of reservoir porosity is essential for estimating potential economic reserves and developing an explored hydrocarbon field. The present study uses high‐quality three‐dimensional (3D) seismic reflection data to decipher the porous zones within the Eocene‐Oligocene‐Miocene intervals of the Upper Assam Basin. The coherency seismic attribute has brought out several fault‐bounded structures that control the reservoir geometry. Random forest‐based machine learning technique has been utilized for the porosity estimation within the formations of interest. It is observed that the north‐east (NE) parts of the targeted intervals are porous with varying porosity of 0.28–0.42. The Miocene period witnessed a high amount of sedimentation within the basin. Different structural highs and thicknesses are pronounced in the NE part of the study region. Thus, the Miocene intervals are favourable leads for the exploitation of hydrocarbons.

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Section: Discussionmentioning

confidence: 99%

Appraisal of reservoir porosity using a machine learning approach: A study from the Eocene‐Miocene interval of Upper Assam Basin, NE, India

Kumar,

Sain

2023

Geological Journal

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“…The mouth of the Subansiri River is extremely vulnerable to erosion because of the region's typical topography (Borgohain et al 2017). The topography of the study area is both hilly and plain region.…”

Section: ………………Eqmentioning

confidence: 99%

Identification of soil erosion‑susceptible areas using fuzzy logic and sediment transport index aided by mineralogical-granulometric analysis in Subansiri basin, Assam, India

Dutta,

Srivast,

Boruah

2024

Preprint

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Erosion poses a significant challenge along the river Subansiri in Assam, India impacting river banks and sediment breakdown. This paper presents a comprehensive study on the identification of soil erosion-susceptible areas in the Subansiri Basin using fuzzy logic modeling and sediment transport index (STI) analysis with emphasis on X-Ray Diffraction (XRD) and grain size analysis. The soil erosion map's overall findings showed that the areas it covered were vulnerable to erosion in severe, very high, high, moderate, and low levels. Slope gradients and flow accumulation were used to calculate the STI on the Raster Calculator in ArcGIS. The Sediment Transport Index ranges from 0 to 2770. This study also aims to elucidate the mineral composition and grain size distributions of sediments sourced from the Subansiri river in Assam. Examination of 12 soil samples facilitated the assessment of their mineral composition and size distribution. Sieve analysis unveiled that a predominant 80% of the soil along the Subansiri river constitutes sand, with lesser percentages attributed to silt and clay, following USDA primary classification guidelines. Utilizing XRD methodology, the major crystalline minerals identified in these sands encompassed Quartz, Montmorillonite, Illite, Calcite, and Plagioclase Feldspar Albite. Skewness and kurtosis is also studied to determine the shape and distribution of the soil samples and the values range from 0.25 to 0.70 signifying a fine skewed to very fine skewed and from − 1.16 to -1.93 showing a very platykurtic distribution. Thus, for a thorough investigation of soil erosion, this research provides a novel hybrid methodology that integrates fuzzy logic, STI, XRD and grain size analysis.

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“…Towards NE, the basin is terminated by the blocks of Mishmi Thrust (Figure 1), and to the SW, it is partially disrupted by the Shillong plateau basement uplift (Figure 1). The convergence of the Indian plate against the Eurasian Plate coupled with the collision with the Burmese Plate promoted intense flexure and structured the central basement of the basin generating several highs and lows (Borgohain et al, 2017; P. C. Kumar & Sain, 2022). The basement structures and overlying sedimentary cover depict platform type with gently elongated fold dissected by faults striking NE–SW or ENE–WSW (Mandal & Dasgupta, 2013; Nandy, 2017; Sahoo & Gogoi, 2011).…”

Section: Geological Settings Of the Basinmentioning

confidence: 99%

“…The basement structures and overlying sedimentary cover depict platform type with gently elongated fold dissected by faults striking NE–SW or ENE–WSW (Mandal & Dasgupta, 2013; Nandy, 2017; Sahoo & Gogoi, 2011). These deposits have undergone intense uplift, folding and faulting because of continuous convergence and collision over the geologic period (Borgohain et al, 2017).…”

Section: Geological Settings Of the Basinmentioning

confidence: 99%

Delineation of oil–water contact within Tipam reservoir: A study from Upper Assam Basin, North‐East India

Kumar

Sain

2023

Geological Journal

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Fluid contacts within a reservoir can vary either because of compartmentalization by faults, lithological variations, hydrocarbon fill history or changes in the hydrodynamic activity of fluids. Their detailed interpretation is significant for estimating potential reserves and developing an explored hydrocarbon field. This study uses high‐quality three‐dimensional (3D) seismic reflection data to decipher the fluid contact zones and their types from the well‐known Tipam reservoir in the petroliferous Upper Assam foreland basin. Different seismic attributes are used to understand the seismic response of fluids and associated structures that structurally control the reservoir geometry. Fluid contact analysis is performed by amalgamating these responses within the target interval. The analysis indicates that the south‐west part of the reservoir is a promising hydrocarbon‐bearing zone and consists of oil–water contacts. These contacts possess a dominant trend of NE–SW within the reservoir. Further, a decreasing trend in the density, velocity and an increasing trend in the resistivity and porosity logs of the wellbore SC‐2 calibrates these inferences and confirms the presence of oil‐bearing zones underlain by water in the SW part of the Tipam reservoir. Thus, the Upper Assam foreland basin is a promising area for hydrocarbon exploration, in which Mid‐Miocene sequences are the potential leads that can be unlocked. The analysis presented through this research could be efficiently and similarly carried out in onshore basins worldwide.

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Structural controls on topography and river morphodynamics in Upper Assam Valley, India

Cited by 16 publications

References 21 publications

Appraisal of reservoir porosity using a machine learning approach: A study from the Eocene‐Miocene interval of Upper Assam Basin, NE, India

Appraisal of reservoir porosity using a machine learning approach: A study from the Eocene‐Miocene interval of Upper Assam Basin, NE, India

Identification of soil erosion‑susceptible areas using fuzzy logic and sediment transport index aided by mineralogical-granulometric analysis in Subansiri basin, Assam, India

Delineation of oil–water contact within Tipam reservoir: A study from Upper Assam Basin, North‐East India

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