叠前联合反演P波阻抗和S波阻抗的研究及应用
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摘要
隐蔽油气藏勘探越来越引起业界的广泛重视,地震资料叠前数据的分析应用成为热点。本文在AVO分析和地震波阻抗反演研究的基础上,分析了Fatti-AVO方程和稀疏尖脉冲反演的原理,对叠前多个角道集数据体实施联合约束稀疏尖脉冲反演,可同时得到P波阻抗、S波阻抗和密度三个数据体。与P波阻抗相比,S波阻抗更能反映岩性和流体。在此基础上提取岩石弹性组合属性参数,再结合AVO属性参数联合用于精细储层描述,可提高识别岩性和流体的精度。在鄂尔多斯地区的实际应用表明,该方法可为识别隐蔽性岩性油气藏提供技术支持。
Exploration of subtle oil/gas reservoirs is paid more and more attention of industry and the analysis and application of prestack data of seismic data are becoming hot point. On the basis of AVO analysis and study of inversion of seismic wave impedance,the paper analyzed the principle of Fat ti-AVO equations and sparse spike inversion and the joint constraint sparse spike inversion was conducted for the data volume of multiple prestack angle-gathers, from which the three data volumes of P-wave impedance , S wave impedance and density could slmulTaneously acquired. In comparison with the P-wave impedance. the S-wave impedance can more reflect the lithology and fluid. The picked e-lastic combining attributes parameters of rocks on that basis are jointly used for fine description of reservoir in combination with AVO attributes parameters, which can improve the precision of identification of hthology and fluid. The practical use in Ordos areas showed that the method can provide a powerful technical support to identify the subtle lithologic oil/gas reservoirs.
Exploration of subtle oil/gas reservoirs is paid more and more attention of industry and the analysis and application of prestack data of seismic data are becoming hot point. On the basis of AVO analysis and study of inversion of seismic wave impedance,the paper analyzed the principle of Fat ti-AVO equations and sparse spike inversion and the joint constraint sparse spike inversion was conducted for the data volume of multiple prestack angle-gathers, from which the three data volumes of P-wave impedance , S wave impedance and density could slmulTaneously acquired. In comparison with the P-wave impedance. the S-wave impedance can more reflect the lithology and fluid. The picked e-lastic combining attributes parameters of rocks on that basis are jointly used for fine description of reservoir in combination with AVO attributes parameters, which can improve the precision of identification of hthology and fluid. The practical use in Ordos areas showed that the method can provide a powerful technical support to identify the subtle lithologic oil/gas reservoirs.
引文
[1] Shuey R T . A simplification of the Zoeppritz equa - tions. Geophysics, 1985,50: 609-614
[2] Fatti J L et al . Detection of gas in sandstone reser - voirs using AVO analysis: A 3-D seismic case history using the Geostack technique. Geophysics, 1994, 50:1362-1376
[3] Verm R and Hilterman F . Lithology color - coded seismic sections: The calibration of AVO crossplot ting to rock properties. The Leading Edge, 1995,14: 847-853
[4] Castagna J P and S W Smith . Comparison of AVO in dicators: A modeling study. Geophysics, 1994, 59: 1849-1855
[5] Smith G C and P M Gidlow . Weighted stacking for rock property estimation and detection of gas. Geo phys Prosp, 1987,35 :993-1014
[6] Cambois G . Can P - wave AVO be quantitative ? The Leading Edge, 2000,19:1246-1251
[7] Cambois G . AVO attributes and noise : Pitfalls of crossplotting. Expanded Abstracts of 68th SEG Mtg, 1998,244-247
[8] Connolly P . Elastic impedance . The Leading Edge , 1999,18:438-452
[9] Hilterman Fet al. AVO examples of long - offset 2-D data in the Golf of Mexico. The Leading Edge ,2000, 19:1200-1213
[10] Gluck S et al . High - resolution impedance layering through 3-D stratigraphic inversion of the poststack seismic data. The Leading Edge, 1997, 16: 1309- 1315
[11] Goodway W et al . Improved AVO fluid detection and lithology discrimination using Lame' petrophysical parameters:"λρ", "μρ", &."λ/μ fluid stack, from P and S inversions. Expanded Abstracts of 68th SEG Mtg, 1998,183-186
[2] Fatti J L et al . Detection of gas in sandstone reser - voirs using AVO analysis: A 3-D seismic case history using the Geostack technique. Geophysics, 1994, 50:1362-1376
[3] Verm R and Hilterman F . Lithology color - coded seismic sections: The calibration of AVO crossplot ting to rock properties. The Leading Edge, 1995,14: 847-853
[4] Castagna J P and S W Smith . Comparison of AVO in dicators: A modeling study. Geophysics, 1994, 59: 1849-1855
[5] Smith G C and P M Gidlow . Weighted stacking for rock property estimation and detection of gas. Geo phys Prosp, 1987,35 :993-1014
[6] Cambois G . Can P - wave AVO be quantitative ? The Leading Edge, 2000,19:1246-1251
[7] Cambois G . AVO attributes and noise : Pitfalls of crossplotting. Expanded Abstracts of 68th SEG Mtg, 1998,244-247
[8] Connolly P . Elastic impedance . The Leading Edge , 1999,18:438-452
[9] Hilterman Fet al. AVO examples of long - offset 2-D data in the Golf of Mexico. The Leading Edge ,2000, 19:1200-1213
[10] Gluck S et al . High - resolution impedance layering through 3-D stratigraphic inversion of the poststack seismic data. The Leading Edge, 1997, 16: 1309- 1315
[11] Goodway W et al . Improved AVO fluid detection and lithology discrimination using Lame' petrophysical parameters:"λρ", "μρ", &."λ/μ fluid stack, from P and S inversions. Expanded Abstracts of 68th SEG Mtg, 1998,183-186
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