Abstract
Shales can be distributed in sand through four different ways; laminated, structural, dispersed and any combination of these aforementioned styles. A careful analysis of well log data is required for the determination of shale distribution in sand affecting its reservoir quality. The objective of this study is to characterize the effect of shale distribution on reservoir quality of sands using well log data. The correlation of well data in terms of lithology has revealed four sand and three shale layers in Lower Goru Formation acting as a major reservoir in the study area. Our results indicate that the laminated type of shale distribution prevails at the Basal sand level, which does not affect its reservoir quality greatly. The remaining layers of variable vertical extent show a variety of shale distribution models affecting their reservoir quality adversely. We also present anisotropic rock physics modelling for AVA analysis at Basal sand level.
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Ahmad, N., P. Fink, S. Strurrock, T. Mahmood, and M. Ibrahim (2004), Sequence stratigraphy as predictive tool in Lower Goru Fairway, Lower and Middle Indus platform, Pakistan”. In: Proc. PAPG-SPE Annual Technical Conference, 8–9 October 2004, Islamabad, Pakistan, 85–104.
Akhter, G., Z. Ahmed, A. Ishaq, and A. Ali (2015), Integrated interpretation with Gassmann fluid substitution for optimum field development of Sanghar area, Pakistan: A case study, Arab. J. Geosci. 8, 9, 7467–7479, DOI: 10.1007/s12517–014–1664–8.
Ali, A., A. Shahraini, and M. Jakobsen (2011), Improved characterization of fault zones by quantitative integration of seismic and production data, J. Geophys. Eng. 8, 2, 259, DOI: 10.1088/1742–2132/8/2/011.
Ali, A., M. Kashif, Hussain, J. Siddique, I. Aslam, and Z. Ahmed (2015), An integrated analysis of petrophysics, cross-plots and Gassmann fluid substitution for characterization of Fimkassar area, Pakistan: A case study, Arab. J. Sci. Eng. 40, 1, 181–193, DOI: 10.1007/s13369–014–1500–1.
Asquith, G.B., D.A. Krygowski, S. Henderson, and N. Hurley (2004), Basic Well Log Analysis, American Association of Petroleum Geologists, 244 pp.
Backus, G.E. (1962), Long-wave elastic anisotropy produced by horizontal layering, J. Geophys. Res. 67, 11, 4427–4440, DOI: 10.1029/JZ067i011p04427.
Bender, F.K., and H.A. Raza (1995), Geology of Pakistan, Borntraeger, Berlin.
Brown, R.J.S., and J. Korringa (1975),, Geophysics 40, 4, 608–616, DOI: 10.1190/1.1440551.
Clavaud, J.B., R. Nelson, U.K. Guru, and H. Wang (2005), Field example of enhanced hydrocarbon estimation in thinly laminated formation with a triaxial array induction tool: A laminated sand-shale analysis with anisotropic shale. In: SPWLA 46th Annual Logging Symposium, 26–29 June 2005, New Orleans, USA, SPWLA-2005-WW.
Clavier, C., G. Coates, and J. Dumanoir (1984), Theoretical and experimental bases for the dual-water model for interpretation of shaly sands, Soc. Petrol. Eng. J. 24, 2,, DOI: 10.2118/6859-PA.
Heslop, K. (2005), Interpretation of Shaly Sands, London Petrophysical Society, London.
Jakobsen, M., and T.A. Johansen (1999), A test of ANNIE based on ultrasonic measurements on a shale, J. Seism. Explor. 8, 1, 77–89.
Jakobsen, M., and T.A. Johansen (2000), Anisotropic approximations for mudrocks: A seismic laboratory study, Geophysics 65, 6, 1711–1725, DOI: 10.1190/1.1444856.
Jakobsen, M., J.A. Hudson, and T.A. Johansen (2003), T-matrix approach to shale acoustics, Geophys. J. Int. 154, 2, 533–558, DOI: 10.1046/j.1365- 246X.2003.01977.x.
Kazmi, A.H., and I.A. Abbasi (2008), Stratigraphy and Historical Geology of Pakistan, Department and National Centre of Excellence in Geology, Peshawar, Pakistan.
Kurniawan, F. (2005), Shaly sand interpretation using CEC-dependent petrophysical parameters, Ph.D. Thesis, Louisiana State University and Agricultural and Mechanical College, Baton Rouge, USA.
La Vigne, J., M. Herron, and R. Hertzog (1994), Density-neutron interpretation in shaly sands. In: Proc. SPWLA 35th Annual Logging Symp., 19–22 June, Tulsa, USA, 16 pp.
Li, S., C.M. Henderson, and R.R. Stewart (2004), Well log study and stratigraphic correlation of the Cantuar Formation, southwestern Saskatchewan, CREWES Res. Rep. 16, 1–18.
Mavko, G., T. Mukerji, and J. Dvorkin (2009), The Rock Physics Handbook: Tools for Seismic Analysis of Porous Media, 2nd ed., Cambridge University Press, Cambridge.
Minh, C.C., J.B. Clavaud, P. Sundararaman, S. Froment, E. Caroli, O. Billon, G. Davis, and R. Fairbairn (2008), Graphical analysis of laminated sandshale formations in the presence of anisotropic shales, Petrophysics 49, 5, 395–405.
Oldham, R.D. (1982), Report on the geology of Thal Chotiali and part of the Mari Country, Records Geol. Survey India 15, 1, 18–29.
Paul, W.J. (2012), Petrophysics, Dept. of Geology and Petroleum Geology, University of Aberdeen.
Powell, C. (1979), A speculative tectonic history of Pakistan and surroundings: some constrains from Indian Ocean. In: A. Farah and K.A. De Jong (eds.), Geodynamics of Pakistan, Geological Survey of Pakistan, Quetta, 5–24.
Rüger, A. (2002), Reflection Coefficients and Azimuthal AVO Analysis in Anisotropic Media, Society of Exploration Geophysicists, Tulsa,, DOI: 10.1190/1.9781560801764.appd.
Rutherford, S.R., and R.H. Williams (1989), Amplitude-versus-offset variations in gas sands, Geophysics 54, 6, 680–688, DOI: 10.1190/1.1442696.
Sams, M.S., and M. Andrea (2001), The effect of clay distribution on the elastic properties of sandstones, Geophys. Prospect. 49, 1, 128–150, DOI: 10.1046/j.1365–2478.2001.00230.x.
Saxena, K., A. Tyagi, T. Klimentos, C. Morriss, and A. Mathew (2006), Evaluating Deepwater Thin-Bedded Reservoirs with the RT Scanner, Petromin, Kuala Lumpur.
Sayers, C.M. (1998), Long-wave seismic anisotropy of heterogeneous reservoirs, Geophys. J. Int. 132, 3, 667–673, DOI: 10.1046/j.1365–246X.1998.00456.x.
Sen, M.K. (2006), Seismic Inversion, Society of Petroleum Engineers, Richardson, USA.
Shahraini, A., A. Ali, and M. Jakobsen (2011), Seismic history matching in fractured reservoirs using a consistent stiffness-permeability model: Focus on the effects of fracture aperture, Geophys. Prospect. 59, 3, 492–505, DOI:10.1111/j.1365–2478.2010.00934.x.
Sunjay, S. (2011), Shale gas: An unconventional reservoir, Department of Geophysics, Banaras Hindu University, Varanasi, India.
Tearpock, D.J., and R.E. Bischke (1991), Applied Subsurface Geological Mapping, Prentice-Hall, Inc., Englwood Cliffs.
Thomas, E.C., and S.J. Stieber (1975), The distribution of shale in sandstones and its effect on porosity. In: Trans. SPWLA 16th Annual Logging Symp., 4–7 June 1975.
Thomsen, L. (1986), Weak elastic anisotropy, Geophysics 51, 10, 1954–1966, DOI:10.1190/1.1442051.
Thomsen, L. (1995), Elastic anisotropy due to aligned cracks in porous rock, Geophys. Prospect. 43, 6, 805–829, DOI: 10.1111/j.1365–2478.1995.tb00282.x.
Tiab, D., and E.C. Donaldson (2003), Petrophysics: Theory and Practice of Measuring Reservoir Rock and Fluid Transport Properties, Gulf Professional Publ., Waltham.
Tsvankin, I. (1997a), Anisotropic parameters and P-wave velocity for orthorhombic media, Geophysics 62, 4, 1292–1309, DOI: 10.1190/1.1444231.
Tsvankin, I. (1997b), Reflection moveout and parameter estimation for horizontal transverse isotropy, Geophysics 62, 2, 614–629, DOI: 10.1190/1.1444170.
Tyagi, A.K., R. Guha, D. Voleti, and K. Saxena (2009), Challenges in the reservoir characterization of a laminated sand shale sequence. In: Proc. 2nd SPWLAIndia Regional Symp., 19–20 November 2009, Mumbai, India.
Visser, J. (1998), Extensile hydraulic fracturing of (saturated) porous materials. Ph.D. Thesis, Department of Civil Engineering and Geosciences, Delft University, Delft, The Netherlands.
Wandrey, C.J., B.E. Law, and H.A. Shah (2004), Sembar Goru/Ghazij composite total petroleum system, Indus and Sulaiman-Kirthar geologic provinces, Pakistan and India, U.S. Geological Survey Bulletin, Report #B 2208-C, 23 pp.
Waxman, M.H., and L.J.M. Smith (1968), Electrical conductivities in oil-bearing shaly sands, SPE J. 8, 2, 107–122.
Zaigham, N.A., and K.A. Mallick (2000),, AAPG Bull. 84, 11, 1833–1848.
Zinszner, B., and F.M. Pellerin (2007), A Geoscientist’s Guide to Petrophysics, Editions Technip, Paris.
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Ali, A., Zubair, Hussain, M. et al. Effect of Shale Distribution on Hydrocarbon Sands Integrated with Anisotropic Rock Physics for AVA Modelling: A Case Study. Acta Geophys. 64, 1139–1163 (2016). https://doi.org/10.1515/acgeo-2016-0041
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DOI: https://doi.org/10.1515/acgeo-2016-0041