【摘要】 碳酸盐岩缝洞型储层的地震反射表现为复杂的绕射波特征,因此提高绕射波成像精度对储层描述与刻画非常重要。基于等效偏移距叠前时间偏移方法,根据绕射波映射到共散射点(CSP)道集后的特征,利用信号倾角分解方法压制映射相干噪声,以减轻其对绕射波成像横向分辨率的影响。鉴于绕射波与映射相干噪声信息的有效分离是关键,提出了一种适应振幅空变的信号分解算法,理论试算验证了该方法的有效性。更多还原

【Abstract】 For carbonate fracture-cave reservoirs,seismic reflections display as complex diffraction,so it is important to improve imaging accuracy of diffraction for reservoir description.Based on the equivalent -offset prestack time migration method,according to the features of diffraction mapped onto CSP gathers,the mapped coherent noise from equivalent-offset transformation was suppressed by signal dip decomposition method to eliminate its impact on the lateral resolution of diffraction imaging.Since the effective sorting of diffraction and mapping of coherent noise is the key step,an improved signal decomposition method suitable to amplitude space-variant was proposed.Theoretical testing proved its feasibility.更多还原