Structural Interpretation of Fenchuganj Gas Field

Deb, Pulok Kanti; Howladar, M. Farhad; Miah, Mohammad Islam; Faruque, Mohammed Omar; Islam, Md. Shofiqul; Mia, Md. Bodruddoza; Chowdhury, Qamruzzaman

doi:10.12966/jegh.08.01.2014

Cited by 4 publications

(3 citation statements)

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“…well stratigraphy in Reimann, 1993), 16.8 ± 0.6 Ma and 19.3 ± 0.8 (lower Bhuban, well Fenchuganj-2; cf. well stratigraphy in Deb et al, 2014). The base of the Barail Formation is constrained at 38 Ma by biostratigraphy (Najman et al, 2008).…”

Section: The Paleo-brahmaputra Sedimentary Record (Surma Basin)mentioning

confidence: 99%

The Brahmaputra tale of tectonics and erosion: Early Miocene river capture in the Eastern Himalaya

Bracciali

Najman

Parrish

et al. 2015

Earth and Planetary Science Letters

117

104

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The Himalayan orogen provides a type example on which a number of models of the causes and consequences of crustal deformation are based and it has been suggested that it is the site of a variety of feedbacks between tectonics and erosion. Within the broader orogen, fluvial drainages partly reflect surface uplift, different climatic zones and a response to crustal deformation. In the eastern Himalaya, the unusual drainage configuration of the Yarlung Tsangpo-Brahmaputra River has been interpreted either as antecedent drainage distorted by the India-Asia collision (and as such applied as a passive strain marker of lateral extrusion), latest Neogene tectonically-induced river capture, or glacial damming-induced river diversion events.Here we apply a multi-technique approach to the Neogene paleo-Brahmaputra deposits of the Surma Basin (Bengal Basin, Bangladesh) to test the long-debated occurrence and timing of river capture of the Yarlung Tsangpo by the Brahmaputra River. We provide U-Pb detrital zircon and rutile, isotopic (Sr-Nd and Hf) and petrographic evidence consistent with river capture of the Yarlung Tsangpo by the Brahmaputra River in the Early Miocene. We document influx of Cretaceous-Paleogene zircons in Early Miocene sediments of the paleo-Brahmaputra River that we interpret as first influx of material from the Asian plate (Transhimalayan arc) indicative of Yarlung Tsangpo contribution. Prior to capture, the predominantly Precambrian-Paleozoic zircons indicate that only the Indian plate was drained. Contemporaneous with Transhimalayan influx reflecting the river capture, we record arrival of detrital material affected by Cenozoic metamorphism, as indicated by rutiles and zircons with Cenozoic UPb ages and an increase in metamorphic grade of detritus as recorded by petrography. We interpret this as due to a progressively increasing contribution from the erosion of the metamorphosed core of the orogen. Whole rock Sr-Nd isotopic data from the same samples provide further support to this interpretation. River capture may have been caused by a change in relative base level due to uplift of the Tibetan plateau. Assuming such river capture occurred via the Siang River in the Early Miocene, we refute the "tectonic aneurysm" model of tectonic-erosion coupling between river capture and rapid exhumation of the eastern syntaxis, since a time interval of at least 10 Ma between these two events is now demonstrated. This work is also the first to highlight U-Pb dating on detrital rutile as a powerful approach in provenance studies in the Himalaya in combination with zircon U-Pb chronology.

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Section: The Paleo-brahmaputra Sedimentary Record (Surma Basin)mentioning

confidence: 99%

The Brahmaputra tale of tectonics and erosion: Early Miocene river capture in the Eastern Himalaya

Bracciali

Najman

Parrish

et al. 2015

Earth and Planetary Science Letters

117

104

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“…The boundary Longitude is E 91º 53' -92º and Latitude is N 24º 30' -24º 37'. The field is thirty kilometers long and eight kilometers wide (Deb et al, 2014). It was discovered by PetroBangla in 1988 (Imam, 2005).…”

Section: Study Area and Geologymentioning

confidence: 99%

“…The age of the whole area extends from the Oligocene to the Pliocene. The structure's gas-bearing fresh sandstones are from the Late Miocene Lower Bokabil formation to Upper Bhuban (Deb et al, 2014). The reservoir contains Miocene alternating dark gray to gray clay and fine to extremely fine grained sandstone (RMP-2 project, 2009).…”

Section: Study Area and Geologymentioning

confidence: 99%

Secondary Porosity Development in Bangladeshi Gas Reservoirs: A Case Study of the Fenchuganj Gas Field (Well no: 2)

Lupin¹,

Islam²,

Solaiman³

2023

Dhaka Univ J Earth Env Sci

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The Fenchuganj gas field is located in Surma basin and is uniform throughout the whole southern area. This study deals with the development of secondary porosity of the gas bearing reservoir sandstone rocks with the microscopic analysis of the core sample rock slides from well 2 of Fenchuganj gas field. The study shows the secondary porosity was generated at the particular depths of 1479-1497 m, 2768-2783 m and 3615-3624 m of Fenchuganj well no.2. The study demonstrates that diagenetic parameters, such as compaction, pressure solution, and cementation, are not the only ones that affect reservoir quality. Other elements include the reservoir rock's chemical environment, acidic water infiltration or dissolution, the presence of any other secondary processes, etc. Acidic water intrusion may have acted as an agent in generation of these secondary porosities. On contrast, the rocks in 2190 m, 3424-3432 m and rest of 3615-3624 m depth, had lost its porosity by the adverse effects of compaction, cementation as well as pore pressure solution. The overall porosity of the rock samples F-2 (1479–1497 m), F-6 (2768–2783 m), and F-10b (3615–3624 m) is around (35–40%), (30–35%), and (20–25%), respectively, indicating excellent, very good, and good reservoir quality for rock slide F-2, F-6, and F-10b, respectively. Changing of chemical environment and consequent dissolution process may contribute to enhance the potentiality of reservoir rock. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 11(1), 2022, P 43-52

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Plio-Pleistocene exhumation of the eastern Himalayan syntaxis and its domal ‘pop-up’

Bracciali

Parrish

Najman

et al. 2016

Earth-Science Reviews

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Structural Interpretation of Fenchuganj Gas Field

Cited by 4 publications

References 0 publications

The Brahmaputra tale of tectonics and erosion: Early Miocene river capture in the Eastern Himalaya

The Brahmaputra tale of tectonics and erosion: Early Miocene river capture in the Eastern Himalaya

Secondary Porosity Development in Bangladeshi Gas Reservoirs: A Case Study of the Fenchuganj Gas Field (Well no: 2)

Plio-Pleistocene exhumation of the eastern Himalayan syntaxis and its domal ‘pop-up’

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