【摘要】 碳酸盐岩缝洞储层具有埋藏深、非均质性强等特点,地震成像精度较低。为了研究碳酸盐岩缝洞储层地震成像分辨率的影响因素,设计了两个溶洞数学模型。采用不同的空间采样间隔和子波主频进行了数值模拟,利用iCluster软件对不同的地震数据进行了叠前深度偏移成像处理。基于成像结果,分析了与溶洞成像纵、横向分辨率有关的影响因素。分析结果表明,溶洞成像纵向分辨率与激发主频关系密切,与空间采样间隔无关;溶洞成像横向分辨率与空间采样间隔和激发主频有关。小的空间采样间隔有利于提高溶洞的成像精度,但减小空间采样间隔并不能无限提高溶洞成像的横向分辨率。更多还原

【Abstract】 Carbonate fracture-cave reservoirs are characterized by deep burial depth and strong heterogeneity,which results in poor imaging resolution.In order to investigate the factors which influence the seismic imaging resolution of carbonate cave reservoirs,two numerical cave model were designed to simulate seismic records by using different sampling intervals and dominant frequency of wavelets. Then pre-stack depth migration was carried out on these seismic records by using the iCluster software.Based on the imaging results,we analyzed the impact factors related to vertical and lateral resolution of imaging.The results demonstrate that vertical resolution of cave model is closely related to dominant frequency and independent from spatial sampling interval,moreover lateral resolution relies on spatial sampling interval and dominant frequency of wavelet.Small spatial sampling interval is beneficial to improve the imaging accuracy.However,reducing the interval can’t increase the lateral resolution infinitely.更多还原