基于目前AVO(Amplitude Versus Offset)反演技术中所普遍使用的Aki-Richards和Shuey近似,以Zoeppritz方程的准确解为参照,针对几种典型油藏反射界面,计算了Aki-Richards和Shuey近似所产生的相对误差,绘出了相对误差随入射角的变化曲线....基于目前AVO(Amplitude Versus Offset)反演技术中所普遍使用的Aki-Richards和Shuey近似,以Zoeppritz方程的准确解为参照,针对几种典型油藏反射界面,计算了Aki-Richards和Shuey近似所产生的相对误差,绘出了相对误差随入射角的变化曲线.计算表明,在存在极性反转的反射界面,Aki-Richards和Shuey近似的计算结果会带来很大的误差,在极性反转点附近的计算结果失去它的可信性;在泥岩与气砂、油砂或水砂组成的反射界面,即便就是在小角度范围内也存在较大的计算误差(如泥岩—气砂反射界,入射角在5°之内,相对误差就超过了10%);在油砂和水砂反射界面Aki Richards和Shuey是很好的近似.本文对Aki-Richards和Shuey近似结合几种典型油藏反射界面给出定量的分析,为储层参数反演方案的设计特别是反演道集及范围的选择提供理论依据.展开更多
With the development of exploration of oil and gas resources,the requirements for seismic inversion results are getting more accurate.In particular,it is hoped that the distribution patterns of oil and gas reservoirs ...With the development of exploration of oil and gas resources,the requirements for seismic inversion results are getting more accurate.In particular,it is hoped that the distribution patterns of oil and gas reservoirs can be finely characterized,and the seismic inversion results can clearly characterize the location of stratigraphic boundaries and meet the needs of accurate geological description.Specifically,for pre-stack AVO inversion,it is required to be able to distinguish smaller geological targets in the depth or time domain,and clearly depict the vertical boundaries of the geological objects.In response to the above requirements,we introduce the preprocessing regularization of the adaptive edge-preserving smooth filter into the pre-stack AVO elastic parameter inversion to clearly invert the position of layer boundary and improve the accuracy of the inversion results.展开更多
文摘基于目前AVO(Amplitude Versus Offset)反演技术中所普遍使用的Aki-Richards和Shuey近似,以Zoeppritz方程的准确解为参照,针对几种典型油藏反射界面,计算了Aki-Richards和Shuey近似所产生的相对误差,绘出了相对误差随入射角的变化曲线.计算表明,在存在极性反转的反射界面,Aki-Richards和Shuey近似的计算结果会带来很大的误差,在极性反转点附近的计算结果失去它的可信性;在泥岩与气砂、油砂或水砂组成的反射界面,即便就是在小角度范围内也存在较大的计算误差(如泥岩—气砂反射界,入射角在5°之内,相对误差就超过了10%);在油砂和水砂反射界面Aki Richards和Shuey是很好的近似.本文对Aki-Richards和Shuey近似结合几种典型油藏反射界面给出定量的分析,为储层参数反演方案的设计特别是反演道集及范围的选择提供理论依据.
基金support of China national key project 41904130 and key research project 041020080060.
文摘With the development of exploration of oil and gas resources,the requirements for seismic inversion results are getting more accurate.In particular,it is hoped that the distribution patterns of oil and gas reservoirs can be finely characterized,and the seismic inversion results can clearly characterize the location of stratigraphic boundaries and meet the needs of accurate geological description.Specifically,for pre-stack AVO inversion,it is required to be able to distinguish smaller geological targets in the depth or time domain,and clearly depict the vertical boundaries of the geological objects.In response to the above requirements,we introduce the preprocessing regularization of the adaptive edge-preserving smooth filter into the pre-stack AVO elastic parameter inversion to clearly invert the position of layer boundary and improve the accuracy of the inversion results.