Delineating the Fluvial Channel System in B-Sand of NIM Block in Lower Indus Basin, Pakistan using 3-D seismic attributes
Keywords:
Post-stack attributes, B-Sand reservoir, Hydrocarbon Prospects, Gas bearing sand zonesAbstract
Seismic attributes have emerged as indispensable tools in hydrocarbon exploration, facilitating the identification and characterization of subsurface reservoirs, including fluvial channel systems. These attributes enhance the interpretation of seismic data by extracting quantitative geological and petrophysical information. This study focuses on the B-Sand reservoir within the Cretaceous Lower Goru Formation in the NIM Block of the Lower Indus Basin, Pakistan, which is a proven hydrocarbon-bearing interval. Using integrated seismic and well log data, we analyzed four key seismic attributes, which are sweetness, trace envelope (TE), relative acoustic impedance (RAI), and root mean square (RMS) amplitude, to delineate fluvial channels and assess reservoir potential. Well log interpretations confirm two dominant lithologies within the B-Sand reservoir: sandstone and shale. Seismic mapping reveals a single prominent horizon and four faults, indicative of a step-faulting structural regime. Sweetness highlights high-amplitude zones, correlating with potential hydrocarbon-saturated sand units. RAI analysis effectively discriminates lithological variations, while TE attributes suggest possible gas accumulations. RMS Amplitude further corroborates hydrocarbon indicators, reinforcing the reservoir's prospectivity. The synergistic application of these attributes demonstrates significant hydrocarbon potential within the B-Sand reservoir, justifying further exploration. This approach provides a robust workflow for reservoir characterization in analogous fluvio-deltaic systems.
References
Abbasi, S. A., Solangi, S. H., & Ali, A. (2015a). Seismic data interpretation: A case study of Southern Sindh Monocline, Lower Indus Basin, Pakistan. Mehran University Research Journal of Engineering and Technology, 34(2), 107–115.
Abbasi, S. A., Solangi, S. H., Nazeer, A., Asim, S., Habib, W., & Solangi, I. A. (2015b). An overview of structural style and hydrocarbon potential of Jabo Field, Southern Sindh Monocline, Southern Indus Basin. Sindh University Research Journal (Science Series), 47(2), 347–354.
Ahmed, S. (2018). Study of tectonic evolution of structures and their hydrocarbon potential using seismic data, Southern Sindh Monocline, Pakistan [Doctoral dissertation, University of Sindh, Jamshoro].
Ahmed, S., Solangi, S. H., Brohi, I. A., Khokhar, Q. D., & Lashari, R. A. (2014). Study of stratigraphy and structural styles in the subsurface of Southern Sindh Monocline, Pakistan: Using seismic and well data. Sindh University Research Journal (Science Series), 46(4), 439-446.
Ahmed, S., Solangi, S. H., Jadoon, M. S. K., & Nazeer, A. (2018). Tectonic evolution of structures in the Southern Sindh Monocline, Indus Basin, Pakistan formed in multi-extensional tectonic episodes of Indian Plate. Geodesy and Geodynamics, 9(5), 358–366.
Ali, A., Alves, T. M., Saad, F. A., Ullah, M., Toqeer, M., & Hussain, M. (2018). Resource potential of gas reservoirs in South Pakistan and adjacent Indian subcontinent revealed by post-stack inversion techniques. Journal of Natural Gas Science and Engineering, 49, 41-55.
Alsouki, M., Taifour, R., & Al Hamad, O. (2014). Delineating the fluvial channel system in the Upper Triassic formation of the Elward area in the Syrian Euphrates Graben using 3-D seismic attributes. Journal of Petroleum Exploration and Production Technology, 4(2), 123–132.
Anees, A., Shi, W., Ashraf, U., & Xu, Q. (2019). Channel identification using 3D seismic attributes and well logging in Lower Shihezi Formation of Hangjinqi area, northern Ordos Basin, China. Journal of Applied Geophysics, 163, 139–150.
Archie, G. E. (1952). Classification of carbonate reservoir rocks and petrophysical considerations. American Association of Petroleum Geologists Bulletin, 36(2), 278–298.
Asquith, G. B., & Gibosn, C. R. (1982). Basic well log analysis for geologists. American Association of Petroleum Geologists.
Asquith, G. B., Krygowski, D., & Gibson, C. R. (2004). Basic well log analysis (Vol. 16). American Association of Petroleum Geologists.
Azeem, T., Chun, W. Y., MonaLisa, Khalid, P., Qing, L. X., Ehsan, M. I., & Wei, X. (2017). An integrated petrophysical and rock physics analysis to improve reservoir characterization of Cretaceous sand intervals in Middle Indus Basin, Pakistan. Journal of Geophysics and Engineering, 14(2), 212-225.
Azeem, T., Yanchun, W., Khalid, P., Xueqing, L., Yuan, F., & Lifang, C. (2016). An application of seismic attributes analysis for mapping of gas bearing sand zones in the Sawan Gas Field, Pakistan. Acta Geodaetica et Geophysica, 51(4), 723–744.
Baig, M. O., Harris, N. B., Ahmed, H., & Baig, M. O. A. (2016). Controls on reservoir diagenesis in the Lower Goru sandstone formation, Lower Indus Basin, Pakistan. Journal of Petroleum Geology, 39(1), 29–47.
Barnes, A. E. (Ed.). (2016). Handbook of poststack seismic attributes. Society of Exploration Geophysicists.
Beaumont, E. A., & Foster, N. H. (Eds.). (1999). Exploring for oil and gas traps (Vol. 3). American Association of Petroleum Geologists.
Bilal, A., Mughal, M. S., Janjuhah, H. T., Ali, J., Niaz, A., Kontakiotis, G., & Yang, R. (2022). Petrography and provenance of the Sub-Himalayan Kuldana Formation: Implications for tectonic setting and Palaeoclimatic conditions. Minerals, 12(7), 794-820.
Blanke, S. J. (2013). Saucer sills of the offshore Canterbury Basin. In Advantage NZ Petroleum Conference. Auckland.
Bridge, J. S., & Tye, R. S. (2000). Interpreting the dimensions of ancient fluvial channel bars, channels, and channel belts from wireline-logs and cores. American Association of Petroleum Geologists AAPG Bulletin, 84(8), 1205–1228.
Brown, A. R. (2011). Interpretation of three-dimensional seismic data. Society of Exploration Geophysicists and American Association of Petroleum Geologists.
Chopra, S., & Marfurt, K. J. (2013). Structural curvature versus amplitude curvature. The Leading Edge, 32(2), 178-184.
Daber, R., Aqrawi, A., Larsen, C., Boe, T. H., Pepper, R., Barros, S., & Scollard, A. (2007). Interpreters' guide to seismic attributes. Schlumberger.
Dake, L. P. (1983). Fundamentals of reservoir engineering (Vol. 8). Elsevier.
Dorn, G. A. (1999). Treatise of petroleum geology/Handbook of petroleum geology: Exploring for oil and gas traps. American Association of Petroleum Geologist.
Ehsan, M., Gu, H., Ali, A., Akhtar, M. M., Abbasi, S. S., Miraj, M. A. F., & Shah, M. (2021). An integrated approach to evaluate the unconventional hydrocarbon generation potential of the Lower Goru Formation (Cretaceous) in Southern Lower Indus basin, Pakistan. Journal of Earth System Science, 130(2), 90.
Emujakporue, G. O., & Enyenihi, E. E. (2020). Identification of seismic attributes for hydrocarbon prospecting of Akos field, Niger Delta, Nigeria. SN Applied Sciences, 2, 1–11.
Hart, B. S. (2008). Channel detection in 3-D seismic data using sweetness. American Association of Petroleum Geologists Bulletin, 92(6), 733–742.
Hart, B. S., & Balch, R. S. (2000). Approaches to defining reservoir physical properties from 3-D seismic attributes with limited well control: An example from the Jurassic Smackover Formation, Alabama. Geophysics, 65(2), 368–376.
Hong, Y., Wang, H., Tian, W., & Mo, A. (2013). Identification and prediction of the high heterogeneous channel sand in Southern Turgay Basin. In AAPG Annual Convention and Exhibition (p. 10515). Pittsburgh, Pennsylvania: American Association of Petroleum Geologists.
Khalid, P., & Ghazi, S. (2013). Discrimination of fizz water and gas reservoir by AVO analysis: A modified approach. Acta Geodaetica et Geophysica, 48(3), 347–361.
Khalid, P., Ehsan, M. I., Akram, S., Din, Z. U., & Ghazi, S. (2018). Integrated reservoir characterization and petrophysical analysis of Cretaceous sands in Lower Indus Basin, Pakistan. Journal of the Geological Society of India, 92(4), 465–470.
Khalid, P., Qayyum, F., & Yasin, Q. (2014). Data-driven sequence stratigraphy of the Cretaceous depositional system, Punjab Platform, Pakistan. Surveys in Geophysics, 35, 1065-1088.
Knight, B., Capitanio, F. A., Weinberg, R. F., & Dal Zilio, L. (2023). India-Asia slowing convergence rate controls on the Cenozoic Himalaya-Tibetan tectonics. Authorea Preprints.
Krois, P., Mahmood, T., & Milan, G. (1998, November). Miano field, Pakistan, A case history of model driven exploration. In Proceedings Pakistan petroleum convention (Vol. 98, pp. 112-131). Pakistan Association of Petroleum Geoscientists (PAPG), Islamabad, Pakistan.
Mehana, M., & El-monier, I. (2016). Shale characteristics impact on Nuclear Magnetic Resonance (NMR) fluid typing methods and correlations. Petroleum, 2(2), 138–147.
Owolabi, A. O., Omang, B. O., Oyetade, O. P., & Akindele, O. B. (2019). Reservoir evaluation and volumetric analysis of Rancho Field, Niger Delta, using well log and 3D seismic data. Open Journal of Geology, 9(13), 974.
Raef, A. E., Mattern, F., Philip, C., & Totten, M. W. (2015). 3D seismic attributes and well-log facies analysis for prospect identification and evaluation: interpreted palaeoshoreline implications, Weirman Field, Kansas, USA. Journal of Petroleum Science and Engineering, 133, 40-51.
Sahoo, T. R., Browne, G. H., & Hill, M. G. (2014). Seismic attribute analysis and depositional elements in the Canterbury Basin. In Poster presented at the Advantage NZ: Geotechnical Petroleum Forum.
Sanguinetti, R. (2006). Image processing techniques applied to 3-D attribute volumes for lithology distribution. In SEG Technical Program Expanded Abstracts 2006 (pp. 1806-1810). Society of Exploration Geophysicists.
Schenk, C. J., Tennyson, M. E., Klett, T. R., Finn, T. M., Mercier, T. J., Gaswirth, S. B., Marra, K. R., Le, P. A., Hawkins, S. J., & Leathers-Miller, H. M. (2017). Assessment of undiscovered oil and gas resources in the Lower Indus Basin, Pakistan, 2017 (No. 2017-3034). US Geological Survey.
Taner, M. T. (2001). Seismic attributes. Canadian Society of Exploration Geophysicists (CSEG) Recorder, 26(7), 49–56.
Taner, M. T., Koehler, F., & Sheriff, R. E. (1979). Complex seismic trace analysis. Geophysics, 44(6), 1041–1063.
Wandrey, C. J., Law, B. E., & Shah, H. A. (2004). Sembar Goru/Ghazij composite total petroleum system, Indus and Sulaiman-Kirthar geologic provinces, Pakistan and India (No. 2208-C).
Wyllie, M. R. J., Gregory, A. R., & Gardner, L. W. (1956). Elastic wave velocities in heterogeneous and porous media. Geophysics, 21(1), 41–70.
Zahmatkesh, I., Kadkhodaie, A., Soleimani, B., Golalzadeh, A., & Azarpour, M. (2018). Estimating Vsand and reservoir properties from seismic attributes and acoustic impedance inversion: A case study from the Mansuri oilfield, SW Iran. Journal of Petroleum Science and Engineering, 161, 259–274.
Zehra, S., & Afsar, S. (2016). Flood hazard mapping of Lower Indus Basin using Multi-Criteria Analysis. Journal of Geoscience and Environment Protection, 4(4), 54-62.
Zhang, J. H., Liu, Z., Zhu, B. H., Feng, D. Y., Zhang, M. Z., & Zhang, X. F. (2011). Fluvial reservoir characterization and identification: A case study from Laohekou Oilfield. Applied Geophysics, 8(3), 181–188.
