论文详情
绕射波独立成像数据为资料精确解释提供了一种新的有用信息,绕射波分离提取的质量与绕射波成像处理资料品质密切相关。探讨了基于优化反演的绕射波提取技术,利用基于余量极小化倾角估计技术实现了反射波倾角的精确估计,利用非线性搜索的极小化优化技术和可行域投影迭代技术实现了绕射波的提取。基于正则化约束优化反演算法的绕射波提取成像方法,能够很好地去除反射波信息,提取出隐藏在偏移剖面中能量很弱的绕射波信息,突显出断层、洞穴、风化壳等异常地质信息。针对塔河油田碳酸盐岩缝洞型储层特点建立了地质模型,数值模拟了正演记录,采用基于优化反演的绕射波成像方法对其进行绕射波分离及成像,验证了方法的实用性。针对塔河油田实际三维地震资料开展了该方法的应用处理研究,对比分析了绕射波成像与常规反射波成像效果。结果表明:绕射波成像在特殊地质体勘探中具有明显的优势,能够精细刻画古风化壳破碎带、小断层、小尺度岩溶洞穴等地质信息,为储层预测提供了更加可靠的信息。
The diffraction wave independent imaging data provides a new and advantageous information for the accurate interpretation of data.The quality of diffraction wave separation and extraction is closely related to the quality of diffraction wave imaging processing.This paper discusses the extraction of diffraction wave based on optimization inversion,the accurate estimation of reflection wave is realized by using the technique of nonlinear search and feasible domain peojection iteration are used to extract diffraction wave.The diffraction imaging method based on the regularization constraint optimization inversion algorithm,the integrated wave extraction method can be used to extract the reflected wave information with weak energy hidden in the migration plane,which highlights the abnormal geological information such as faults,holes and weathering crusts.According to the characteristics of Tahe carbonate reservoir,the geological model is established,and the forward numerical simulation record is generated.Diffraction wave extraction technology based on optimization inversion is used to separate and image the diffraction wave,and the adaptability of this technology is verified.Based on optimization inversion,diffraction wave extraction and imaging processing are studied for the actual 3D seismic data of Tahe oilfield,and the differences between diffraction wave imaging and conventional reflection wave imaging are analyzed.The results show that diffracted wave imaging has obvious advantages in special geological body exploration,and can accurately depict the geological information of ancient weathering crust fracture zone,small fault,small scale karst cave and so on,which provides positive information for reservoir prediction and analysis.
国家重点研发计划(2017YFB0202904)资助。