摘要:
基于匹配追踪强反射分离方法在实际应用中取得了较好的效果,但关键参数的选择仍存在一些问题,相关研究较少。本文针对匹配追踪强反射分离方法中频率参数的优选问题,开展了详细的研究工作,并形成技术流程。首先,从地震波传播和衰减的角度,分析了地震波频率的空间变化特征,提出频率约束匹配追踪算法的思路;然后,设计相应的地质模型,开展频率优选测试研究,采用上覆地层频率约束匹配追踪算法进行强反射分离,测试结果验证了方法的准确性和有效性;最后,针对塔里木盆地碳酸盐岩缝洞型储层,开展上覆地层频率约束匹配追踪强反射分离技术的应用。应用成果表明,基于上覆层频率约束的匹配强反射分离技术能更合理、有效地分离强反射同相轴,下伏小尺度缝洞体特征更加明显,应用效果显著。研究促进了匹配追踪强反射分离技术的进一步优化,提高了资料的适应能力和实际应用效果,为后续进一步推广应用奠定了更好的基础。
Abstract:
The strong seismic reflection separation method based on the matching pursuit algorithm has yielded encouraging results in practical applications.However,this method faces some challenges in the selection of key parameters and has been scarcely investigated.This study thoroughly investigated the optimization of frequency parameters in the method thereof and established a technical process.First,this study analyzed the spatial variations in the frequency of seismic waves from the perspective of seismic wave propagation and attenuation and proposed a matching pursuit algorithm under the constraints of frequency.Then,this study designed corresponding geological models,conducted frequency optimization tests,and separated the strong seismic reflections using the matching pursuit algorithm under the constraints of the seismic wave frequency of the overlying strata.The test results verify the accuracy and effectiveness of the strong reflection separation method.Finally,the strong reflection separation method was applied to the fracture-vug carbonate reservoirs in the Tarim Basin.The great application effects indicate that the separation method can separate strong reflection events more reasonably and effectively,making the characteristics of underlying small-sized fractures and vugs more significant.This study further optimizes the strong reflection separation method based on matching pursuit and improves the adaptability and application performance of seismic data,thus laying a better foundation for further promotion and application of this method.
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