Abstract
Since the four decades amplitude versus offset (AVO) analysis is used extensively in hydrocarbon exploration to discriminate the hydrocarbon fluids from background geology. Conventionally AVO analysis involves calculation of intercept and gradient from a linear fit of compressional wave reflection coefficient to the sine square of the angle of incidence. Mississauga formation of early cretaceous is the reservoir rock in the study area, contains hydrocarbons and condensates in the middle part. It is very difficult to discriminate hydrocarbon fluids from non pay zones due to small thickness and low quality of pay zone. AVO forward modeling is done to estimate and analyze various AVO derived attributes for the discrimination of hydrocarbon from background sand. After calculating the AVO attributes, appropriate pairs of these attributes are crossplotted so that the hydrocarbon and non-hydrocarbon facies cluster together for quick identification and interpretation. In intercept/gradient crossplot the top of the gas zone falls in quadrant II and show clear deviation from background trend. The analysis reveals that oil and gas sand attributes are strongly different from water sand attributes. Among various attributes, the fluid factor and intercept are more promising attribute for fluid discrimination.
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References
Ahmed N (2013) Rock physics modeling and sensitivity analysis of AVO derived indicators to discriminate fluids and lithologies of Penobscot area, Nova scotia, Canada. Dissertation, University of the Punjab.
Aki K, Richards PG (1980) Quantitative seismology: theory and methods. W. H. Freeman, San Francisco
Batzle ML, Han DH, Hofmann R (2001) Optimal hydrocarbon indicators. In: Annual International Meeting, SEG expanded abstracts. San Antonio, Texas, pp 1697–1700
Berryman JG, Berge PA, Bonner BP (2002) Estimating rock porosity and fluid saturation using only seismic velocities. Geophysics 67:39–404
Biot MA (1941) General theory of three-dimensional consolidation. J Appl Phys 12:155–164
Bortfeld R (1961) Approximation to the reflection and transmission coe? Coefficients of plane longitudinal and transverse waves. Geophys Prospect 9:485–502
Castagna JP, Batzle ML, Eastwood RL (1985) Relationships between compressional and shear-wave velocities in clastic silicate rocks. Geophysics 50:551–570
Castagna JP, Smith SW (1994) Comparison of AVO indicators: a modeling study. Geophysics 59:1849–1855
Castagna JP, Swan HW (1997) Principles of AVO crossplotting. Lead Edge 16:337–342
Castagna JP, Swan HS, Foster DJ (1998) Framework for the interpretation of AVO intercept and gradient. Geophysics 63:948–956
Chen T, Goodway B, Zhang W, Potocki D, Calow B, Gray D (1998) Integrating geophysics, geology and petrophysics: a 3D seismic AVO and borehole/logging case study. In: 68th Annual international meeting of SEG expanded abstracts, paper INT 2.6
Chopra S, Alexeev V, Xu Y (2003) 3D AVO Crossplotting—an effective visualization technique. SEG technical program expanded abstracts, pp 189–192
Connolly P (1999) Elastic impedance. Lead Edge 18:438–452
Fatti JL, Vail PJ, Smith GC, Strauss PJ, Levitt PR (1994) Detection of gas in sandstone reservoirs using AVO analysis: a 3-D seismic case history using the geostack technique. Geophysics 59:1362–1376
Foster DJ, Keys RG, Schmitt DP (1997) Detecting subsurface hydrocarbons with elastic wavefields. In: Chavent G, Papanicolaou G, Sacks P, Symes W (eds) Inverse problems in wave propagation. Springer Verlag, Berlin
Gassmann F (1951) Uber die Elastizitat poroser Medien. Vierteljahrsschr Natforsch Ges Zür 96:1–23
Goodway W, Chen T, Downton J (1997) Improved AVO fluid detection and lithology discrimination using Lamé petrophysical Parameters; “Lambda-Rho”, “Mu-Rho”, and “Lambda/Mu fluid stack”, from P and S inversions. In: 67th Annual international meeting, SEG expanded abstracts, pp 183–186
Gray D, Goodway W, Chen T (1999) Bridging the gap: using AVO to detect changes in fundamental elastic constants. In: Annual international meeting, SEG expanded abstracts, pp 852–855
Greenberg ML, Castagna JP (1992) Shear-wave velocity estimation in porous rocks: theoretical formulation, preliminary verifications and applications. Geophys Prospect 40:195–209
Hedlin K (2000) Pore space modulus and extraction using AVO. In: 70th Annual international meeting, SEG expanded abstracts, pp 170–173
Hill R (1952) The elastic behavior of a crystalline aggregate. Proc Phys Soc Lond Ser A 65:349–354
Hilterman F (2001) Seismic amplitude interpretation. SEG distinguished instructor short course
Jing-Ye L (2012) Gas reservoir identification by seismic AVO attributes on fluid substitution. Appl Geophys 9:139–148
Khalid P, Ghazi S (2013) Discrimination of fizz water and gas reservoir by AVO analysis: a modified approach. Acta Geod Geophys 48:347–361
Khalid P, Brosta D, Nichita DV, Blanco J (2014a) A modified rock physics model for analysis of seismic signatures of low gas-saturated rocks. Arab J Geosci 7:3281–3295
Khalid P, Ahmed N, Khan KA, Naeem M (2014b) AVO-derived attributes to differentiate reservoir facies from non-reservoirs facies and fluid discrimination in Penobscot area, Nova Scotia. Geosci J. doi:10.1007/s12303-014-0048-0
Khan KA, Akhter G, Ahmad Z (2010) OIL—output input language for data connectivity between geoscientific software applications. Comput Geosci 36:687–697. doi:10.1016/j.cageo.2009.09.005
Krief M, Garat J, Stellingwerff J, Ventre J (1990) A petrophysical interpretation using the velocities of P and S waves (full-waveform sonic). Log Anal 31:355–369
Mavko G, Mukerji T, Dvorkin J (2009) The rock physics handbook. Cambridge University Press, Cambridge
Murphy W, Reischer A, Hsu K (1993) Modulus decomposition of compressional and shear velocities in sand bodies. Geophysics 58:227–239
Quakenbush M, Shang B, Tuttle C (2006) Poisson impedance. Lead Edge 25:128–138
Reuss A (1929) Berechnung der fliessgrense von mischkristallen auf grund der plastizitatbedingung fur einkristalle. Zeitschrift furAnge-wandte Mathematik aus Mechnik 9:49–58
Ross CP, Kinman DL (1995) Non-bright spot AVO: two examples. Geophysics 60:1398–1408
Ross CP (2000) Effective AVO crossplot modeling: a tutorial. Geophysics 65:700–711
Russell B, Hedlin K, Hilterman F, Lines L (2003) Fluid-property discrimination with AVO: a Biot-Gassmann perspective. Geophysics 68:29–39
Shuey RT (1985) A simplification of the Zoeppritz equations. Geophysics 50:609–614
Smith GC, Gidlow PM (1987) Weighted stacking for rock property estimation and detection of gas. Geophys Prospect 35:993–1014
Swan HW (1993) Properties of direct AVO hydrocarbon indicators. In: Castagna JP, Backus MM (eds) Offset-dependent reflectivity—theory and practice of AVO analysis. Soc Expl Geophys, pp 78–92
Thaper MR (2012) AVO and attributes for reservoir analysis. In: Extended abstract. International geophysical conference and oil & gas exhibition, Istanbul, Turkey, 7–19 September 2012.
Verm R, Hilterman FJ (1995) Lithology color-coded seismic sections: the calibration of AVO crossplotting to rock properties. Lead Edge 14:847–853
Voigt W (1910) Lehrbuch der Kristallphysik. Teubner, Leipzig
Wade JA, Maclean BC (1990) The geology of the southeastern margin of Canada. In: Keenand MJ, Williams GL (eds) Geology of North America. Geological Society of America, Boulder, pp 167–238
Wood AB (1941) A textbook of sound. G. Bell and sons, London
Zoeppritz K (1919) Erdbebenwellen VIIIB, On the reflection and propagation of seismic waves. Göttinger Nachrichten I:66–84
Acknowledgments
The authors would like to acknowledge to dGB Earth Sciences for providing data. We are grateful to Farrukh Qayyum (dGB Earth Sciences, The Netherlands) for valuable discussions. We owe a lot of it to K-tron GeoStudio for providing the licenses of their software for the completion of this work. Seismic Micro Technology (SMT) provides the Kingdom 8.4 to the Institute of Geology is also acknowledged.
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Ahmed, N., Khalid, P., Ghazi, S. et al. AVO forward modeling and attributes analysis for fluid’s identification: a case study. Acta Geod Geophys 50, 377–390 (2015). https://doi.org/10.1007/s40328-014-0097-x
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DOI: https://doi.org/10.1007/s40328-014-0097-x