none 10.1190/geo2012-0529.1 Society of Exploration Geophysicists Society of Exploration Geophysicists 186 64585923 5981 2025121114450485000 10.1190 2025-12-11T19:45:15Z 2013-10-03T09:08:12Z 118 Geophysics 1942-2156 0016-8033 11 1 2013 11 01 2013 78 6 Zhaoyun Zong China University of Petroleum (Huadong) 1 , Qingdao, Shandong, . E-mail: zhaoyunzong@yahoo.com ; xyyin@upc.edu.cn ; guochenwu@upc.edu.cn . China Xingyao Yin China University of Petroleum (Huadong) 1 , Qingdao, Shandong, . E-mail: zhaoyunzong@yahoo.com ; xyyin@upc.edu.cn ; guochenwu@upc.edu.cn . China Guochen Wu China University of Petroleum (Huadong) 1 , Qingdao, Shandong, . E-mail: zhaoyunzong@yahoo.com ; xyyin@upc.edu.cn ; guochenwu@upc.edu.cn . China ABSTRACT Young’s modulus and Poisson’s ratio are related to quantitative reservoir properties such as porosity, rock strength, mineral and total organic carbon content, and they can be used to infer preferential drilling locations or sweet spots. Conventionally, they are computed and estimated with a rock physics law in terms of P-wave, S-wave impedances/velocities, and density which may be directly inverted with prestack seismic data. However, the density term imbedded in Young’s modulus is difficult to estimate because it is less sensitive to seismic-amplitude variations, and the indirect way can create more uncertainty for the estimation of Young’s modulus and Poisson’s ratio. This study combines the elastic impedance equation in terms of Young’s modulus and Poisson’s ratio and elastic impedance variation with incident angle inversion to produce a stable and direct way to estimate the Young’s modulus and Poisson’s ratio, with no need for density information from prestack seismic data. We initially derive a novel elastic impedance equation in terms of Young’s modulus and Poisson’s ratio. And then, to enhance the estimation stability, we develop the elastic impedance varying with incident angle inversion with damping singular value decomposition (EVA-DSVD) method to estimate the Young’s modulus and Poisson’s ratio. This method is implemented in a two-step inversion: Elastic impedance inversion and parameter estimation. The introduction of a model constraint and DSVD algorithm in parameter estimation renders the EVA-DSVD inversion more stable. Tests on synthetic data show that the Young’s modulus and Poisson’s ratio are still estimated reasonable with moderate noise. A test on a real data set shows that the estimated results are in good agreement with the results of well interpretation. 11 1 2013 11 01 2013 10 03 2013 N35 N42 10.1190/geo2012-0529.1 https://pubs.geoscienceworld.org/geophysics/article/78/6/N35/300664/Elastic-impedance-parameterization-and-inversion https://pubs.geoscienceworld.org/seg/geophysics/article-pdf/78/6/N35/3232326/geo2012-0529.pdf https://pubs.geoscienceworld.org/seg/geophysics/article-pdf/78/6/N35/3232326/geo2012-0529.pdf http://geophysics.geoscienceworld.org/cgi/doi/10.1190/geo2012-0529.1 Quantitative seismology Aki 2nd ed. 1980 0016-8033 Geophysics Alemie 76 3 2011 10.1190/1.3554627 High-resolution three-term AVO inversion by means of a Trivariate Cauchy probability distribution 1070-485X The Leading Edge Arsalan 28 2009 10.1190/1.3249775 Application of extended elastic impedance: A case study from Krishna-Godavari Basin, India Cambois 2000 10.1190/1.1815671 AVO inversion and elastic impedance 1070-485X The Leading Edge Connolly 18 1999 10.1190/1.1438307 Elastic impedance Downton J. E. , 2005, Seismic parameter estimation from AVO inversion: Ph.D. thesis, University of Calgary. 1070-485X The Leading Edge Duffaut 19 2000 10.1190/1.1438510 Shear-wave elastic impedance 0016-8033 Geophysics Fatti 59 1994 10.1190/1.1443695 Detection of gas in sandstone reservoirs using AVO analysis: A 3-D seismic case history using the Geostack technique Goodway 1997 Improved AVO fluid detection and lithology discrimination using Lamé petrophysical parameters; “lambda rho”,”mu rho”, & “lambda/mu fluid stack”, from P and S inversions 1070-485X The Leading Edge Harris 30 2011 10.1190/1.3567259 Mechanical anisotropy in the Woodford Shale, Permian Basin: Origin, magnitude, and scale 0016-8033 Geophysics Lu 69 2004 10.1190/1.1649385 Elastic impedance inversion of multichannel seismic data from unconsolidated sediments containing gas hydrate and free gas Ma 2005 10.1190/1.2144318 The exact elastic impedance as a ray-path and angle of incidence function Ma 2006 10.1190/1.2370117 A fluid detection study from Zoeppritz elastic impedance 0016-8033 Geophysics Mallick 72 1 2007 10.1190/1.2387108 Amplitude-variation-with-offset, elastic-impedence, and wave-equation synthetics --- A modeling study 1070-485X The Leading Edge Mallick 19 2000 10.1190/1.1438512 Hybrid seismic inversion: A reconnaissance tool for deepwater exploration Martins 2002 10.1190/1.1817050 An approach for elastic impedance in weakly anisotropic media 0016-8033 Geophysics Morozov 75 2 2010 10.1190/1.3318268 Exact elastic P/SV impedance 0016-8033 Geophysics Russell 76 3 2011 10.1190/1.3555082 Linearized AVO and poroelasticity 0016-8033 Geophysics Russell 68 2003 10.1190/1.1543192 Fluid-property discrimination with AVO: A Biot-Gassmann perspective 0016-8033 Geophysics Sacchi 60 1995 10.1190/1.1443845 High-resolution velocity gathers and offset space reconstruction Savic 2000 10.1190/1.1816160 Elastic impedance inversion in practice Sena 2011 10.1190/1.3627542 Seismic reservoir characterization in resource shale plays: “Sweet spot” discrimination and optimization of horizontal well placement 0016-8033 Geophysics Shuey 50 1985 10.1190/1.1441936 A simplification of the Zoeppritz equations 1070-485X The Leading Edge Thompson 28 2009 10.1190/1.3104077 Distinguishing gas sand from shale/brine sand using elastic impedance data and the determination of the lateral extent of channel reservoirs using amplitude data for a channelized deepwater gas field in Indonesia 1672-7975 Applied Geophysics Wang 3 2006 10.1007/s11770-006-0018-z Lamé parameters inversion based on elastic impedance and its application 0016-8033 Geophysics Whitcombe 67 2002 10.1190/1.1451331 Elastic impedance normalization Zhang 2009 10.1190/1.3255350 Fluid discrimination study from fluid elastic impedance (FEI) Oil Geophysical Prospecting Zong 46 2011 Elastic impedance Bayesian inversion for Lamé parameters extracting 0016-8033 Geophysics Zong 77 6 2012 10.1190/geo2011-0214.1 AVO inversion and poroelasticity with P- and S-wave moduli