Improving Insights Into Petrophysics using Geophysical Data for the Habiganj Structure, Surma Basin, Bangladesh

Kamruzzaman, Md.; Hossain, Delwar; Sarker, Mizanur Rahman; Shahriar, Md. Upal

doi:10.1002/9781119679998.ch21

Cited by 1 publication

(2 citation statements)

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“…With time, the depositional environment started to be shallower as the Bengal Delta is a southward prograding delta system [15,69]. Further, in the southward direction from the lower delta front setting in the upper part of the Lower Surma, the depositional environment was more terrestrial according to different studies completed based on seismic and wireline log data and the global Miocene sea-level curve [33,[73][74][75][76]. The entire lower part and a portion of the middle part of the Upper Surma are not well exposed over a thickness of about 1100 meters in the study area.…”

Section: Depositional Environment and Sandbody Architecturementioning

confidence: 99%

“…Different distributary channels were active during that time that deposited huge amounts of coarser sediments in their mouth bars by rapid deceleration of unidirectional flow generated in the upstream rivers [51,55]. A thick succession of fluvial sediments have been interpreted by numerous researchers in different studies, most of those works are based on seismic or outcrop studies conducted further downstream in other parts of the Bengal Basin [33,[73][74][75][76]. Previous studies based on outcrops and indications from wireline logs suggest that the unexposed Surma Group deposits in the study area are deltaic and braided fluvial deposits [74].…”

Section: Depositional Environment and Sandbody Architecturementioning

confidence: 99%

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Reservoir Heterogeneity in the Fluvio-Deltaic Deposits: A Case Study from the Surma Group Succession Exposed in the North-Eastern Surma Basin, Bangladesh

Rahman

2024

Preprint

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Well-exposed fluvio-deltaic Surma Group successions of the northeastern Surma Basin provide a direct analogue to its equivalent subsurface successions—the main hydrocarbon reservoirs in Bangladesh. The various levels of lateral and vertical heterogeneities lead to changes in the subsurface sandbody distributions and their reservoir qualities across fields. The present study aims to identify the heterogeneities in the fluvio-deltaic Surma Group successions by detailed sedimentological analysis of the Mio-Pliocene-aged Surma Group successions. Eleven lithofacies have been identified and based on the recurring pattern of these facies within the Surma Group, five facies associations have been identified. The facies associations indicate that these deposits originated from diverse depositional settings, ranging from the prodelta to the alluvial to delta plain. As a whole, they represent a progressive shallowing upward succession with two transgressive events in the upper and lower parts of the Surma Group. Five levels of heterogeneities such as prodelta mud (HL-I), tidal heterolithic deposits (HL-II & III), interbedded mud units in delta front (HL-IV), and intercalated mud laminae, drapes (HL-V) have been identified in the fluvio-deltaic Surma Group. The study suggests that the various levels of reservoir heterogeneities are controlled by the occurrence and distribution of various facies associations.

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