广安地区须四段气藏叠前地震反演研究
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摘要
广安地区须四段储层非均质性强,气、水关系复杂,储层预测与气、水识别是勘探中最迫切需要解决的问题。利用叠前地震反演可获取纵波阻抗、横波阻抗与密度等多种信息,从而用于储层预测与气、水识别。文章通过岩石物理分析、AVO模型正演,论证了叠前反演技术用于该区储层预测与气、水识别具有可行性,并利用近、中、远3个偏移距的部分叠加数据体反演出了纵波阻抗、横波阻抗及密度,最后利用纵波阻抗、横波阻抗及密度计算出多种弹性参数综合预测了研究区域储层厚度展布及气、水分布。文章的研究表明叠前反演技术对于该区须家河组储层预测与气、水识别都有较好的效果,对须家河组储层预测及气、水识别有良好的应用前景。
X4 formation in Guangan area is severely anisotropicand has complex gas-water relationship.Reservoir prediction and gas-water identification are the major prospecting problems needing urgent solutions.Through pre-stack inversion the P-impedance,S-impedance,and density can be obtained,which will then be used for reservoir prediction and gas/water identification.In this paper on basis of petrophysical analysis and AVO modeling,it is proved Prestack inversion can be used for reservoir prediction and gas/water identification in this area.Part stack data of the near,middle and far offset were used to get the inversion results of P-impedance,Simpedance,and density.And then various elastic parameters were calculated to predict the thickness of the reservoir and the gas-water distribution in the area.The study indicates the pre-stack inversion technology is effective for reservoir prediction and gas-water identi fication for Xujiahe formation.
X4 formation in Guangan area is severely anisotropicand has complex gas-water relationship.Reservoir prediction and gas-water identification are the major prospecting problems needing urgent solutions.Through pre-stack inversion the P-impedance,S-impedance,and density can be obtained,which will then be used for reservoir prediction and gas/water identification.In this paper on basis of petrophysical analysis and AVO modeling,it is proved Prestack inversion can be used for reservoir prediction and gas/water identification in this area.Part stack data of the near,middle and far offset were used to get the inversion results of P-impedance,Simpedance,and density.And then various elastic parameters were calculated to predict the thickness of the reservoir and the gas-water distribution in the area.The study indicates the pre-stack inversion technology is effective for reservoir prediction and gas-water identi fication for Xujiahe formation.
引文
[1]Xu S and White R E.A new velocity model for clay sand mixtures[J].Geophysical prospecting,1995,43:91-118.
[2]Rasmussen K B.Simultaneous Seismic Inversion[J].EAGE 66th conference,2004:7-10.
[2]Rasmussen K B.Simultaneous Seismic Inversion[J].EAGE 66th conference,2004:7-10.
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