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Application of instantaneous spectral analysis and acoustic impedance wedge modeling for imaging the thin beds and fluids of fluvial sand systems of Indus Basin, Pakistan

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Abstract

Fluvial sand frameworks have magnificent oil and gas reservoirs far and wide. The reservoir sands are exceedingly compartmentalized by the broadened fault framework. So, to distinguish the thin beds of gas-bearing facies is an assessment for band-limited stratigraphic investigation. To conquest this issue, we execute the progressed seismic ascribe methods to the 3D seismic information of the Miano area of the Indus Basin, SW Pakistan. Apparatuses, for example, the seismic amplitude and coherence are discovered less exact for reservoir description. Sweetness analysis indicates the gas-bearing reservoir facies, which are compartmentalized by the NNW–SSE oriented normal fault system. Yet, the continuous wavelet transforms (CWT) of spectral decomposition (SD) separates the thick and thin sand beds of channel sand and point bars, which were not unsurprising utilizing the band-limited seismic properties. 22 Hz demonstrates the best amplitude tuning cube, which recognizes the profitable clastic (sand-filled barrier bars) sequences. The net-to-gross (N/G) examination uncovers the barrier bars as the chief hydrocarbon-bearing facies. 22 to 37 Hz frequencies confirm the occurrence of hydrocarbon sands. The acoustic impedance (AI) wedge model settles the thin beds of barrier bars sands, which are encased inside the shales, and affirm the suggestions for gas-bearing stratigraphic traps.

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Acknowledgements

Authors are thankful to the Directorate General of Petroleum Concession (DGPC) for giving the permission to publish this paper. We are also thankful to Department of Earth Sciences, Quaid-I-Azam University and LMKR for providing the research data. We are highly grateful to the respected reviewers for their positive criticism, which made our manuscript in an excellent form. Seismic-micro-technology (SMT) Kingdom platform support is highly acknowledged during this research project.

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Authors and Affiliations

  1. Department of Earth Sciences, Quaid-I-Azam University, Islamabad, 44000, Pakistan

    Muhammad Tayyab Naseer & Shazia Asim

  2. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, China

    Shazia Asim

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  1. Muhammad Tayyab Naseer
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  2. Shazia Asim
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Correspondence to Muhammad Tayyab Naseer.

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Corresponding editor: N V Chalapathi Rao

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Naseer, M.T., Asim, S. Application of instantaneous spectral analysis and acoustic impedance wedge modeling for imaging the thin beds and fluids of fluvial sand systems of Indus Basin, Pakistan. J Earth Syst Sci 127, 97 (2018). https://doi.org/10.1007/s12040-018-0997-1

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  • DOI: https://doi.org/10.1007/s12040-018-0997-1

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