Seismo-stratigraphic and structural interpretation of seismic data of Titas gas field,Bengal basin,Bangladesh |
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| Authors: | Md Sultan-Ul-Islam Md Aminul Islam Md Hasan Latif Md Aftabuzzaman Syed Mustafizur Rahman Md Ismail Molla Mohamed Ragab Shalaby |
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| Institution: | 1.Department of Geology and Mining,University of Rajshahi,Rajshahi,Bangladesh;2.Department of Geological Sciences, Faculty of Science,Universiti Brunei Darussalam,Jalan Tungku Link, Gadong,Brunei;3.Department of Applied Physics and Electronic Engineering,University of Rajshahi,Rajshahi,Bangladesh |
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| Abstract: | In the present study, seismic interpretation has been carried out over Titas structure of Bengal basin, Bangladesh to figure out its seismo-stratigraphic and structural behavior. Seven well marked reflecting horizons (R-01 to R-07) have been identified within the Neogene sedimentary sequences using 18 seismic sections and well log data. A new seismic stratigraphy of Neogene sequences has been proposed for the Titas structure ruling out the traditional lithostratigraphy. The studied structure has been divided into 3 megasequences (MS1, MS2 and MS3). Reflector R-01 and R-03 represent the tops of the megasequence 2 (MS2) and megasequence 1 (MS1) respectively. These well marked reflectors are correlated with the top of the traditional litho-groups called Tipam and Surma. Reflectors R-02 and R-04 represent acoustic impedance boundaries within MS2 and MS1 due to lithological gradation. However, R-02 and R-04 are not considered as sequence/ formation boundaries because geologically these are not well defined. Reflectors R-05, R-06 and R-07 represent top of the gasbearing zones A, B and C that belongs to MS1. All these interfaces or reflectors are anti-form with a central long crestal zone. It forms a north-south trending semi-domal sub-surface anticlinal structure having a semi-dome shaped closure. The structure is asymmetric with steeper eastern flank and gentler western flank. The crestal region is essentially plain with discontinuous reflection. The semidomal nature of the anticline is in contrast to the neighboring narrow anticlines. Structural pattern suggests its development in relation to the NE-SW trending stress field due to convergence of Indian plate with Burmese plate. Structures of the shallower and deeper reflectors are formed at different phases of structural development. |
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