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Research Articles

Estimating sedimentary thickness of Lanka Basin using digitised scanned seismic sections

Authors:

KCC Silva,

University of Sri Jayewardenepura, LK
About KCC
Department of Physics, Faculty of Applied Sciences
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NGS Shantha Gamage ,

University of Sri Jayewardenepura, LK
About NGS Shantha
Department of Physics, Faculty of Applied Sciences
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DA Weerasinghe

Petroleum Resources Development Secretariat, LK
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Abstract

In exploration geophysics, seismic surveys and their interpretations provide the most reliable information of the subsurface structures. Extensive work on the determination of the subsurface structure has been carried out in both Cauvery and Mannar basins of offshore Sri Lanka. Freely available satellite- gravity and magnetic data suggest that the Lanka Basin may have the necessary sediment volume for the occurrence of hydrocarbons. However, without seismic data, this suggestion cannot be tested further. As an alternative to acquiring additional seismic data in the region, this research focused on digitising 50,000 km of vintage seismic lines from the National Geophysical Data Centre (NGDC) data repository and converting them into Seg-Y format. Key seismic horizons on the digitised sections were interpreted to provide details of the seabed and acoustic basement in the time domain. Regional sedimentary thickness maps were compiled in the time domain interpolating the interpreted horizons using ‘kriging’ method. The velocity data acquired in the region were used to convert the maps from time to depth domain. The results indicate that average thickness of sediments in the region varies around 5000 m to 6000 m, where the maximum thickness is around 8000 m in the North Eastern part of the Lanka basin. The thickness maps can be used as a reference dataset to plan commercial seismic surveys in the future for hydrocarbon exploration in the Lanka Basin.

How to Cite: Silva, K., Gamage, N.S. and Weerasinghe, D., 2019. Estimating sedimentary thickness of Lanka Basin using digitised scanned seismic sections. Journal of the National Science Foundation of Sri Lanka, 47(3), pp.357–362. DOI: http://doi.org/10.4038/jnsfsr.v47i3.9301
Published on 30 Sep 2019.
Peer Reviewed

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