Wavefield decomposition based on sparse-constrained parabolic Radon transform in the frequency domain
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摘要: 在塔里木盆地深部碳酸盐岩地层中发现了多种类型的非层状、非规则油气储集体, 这些储集体不同于层状储层, 是横向尺度至少在一个方向为有限的地质体。实际观测到的地震反射波场, 是由层状地层与非层状、非规则地质体形成的反射波、绕射波(散射波)组成的复合波场, 在不同的数据集中此三类波场呈现不同的形态特征。本文以波场形态特征差异为基础, 采用基于图形引导的稀疏约束频率域抛物线Radon变换的层状波场与随机波场的分离技术, 将高信噪比的、未经偏移处理或经偏移处理的复合反射波场数据分解为横向尺度“无限”延伸的反射波场和横向尺度有限的非规则地质体的绕射(散射)波场, 为直接对非规则储集体进行预测和研究奠定基础。该技术在塔里木盆地和鄂尔多斯盆地应用取得了很好的效果。Abstract: Multiple types of non-layered and irregular hydrocarbon reservoirs have been found in the deep carbonate strata within the Tarim Basin. These carbonate reservoirs, different from layered reservoirs, are geological bodies with limited lateral bodies in at least one direction. The observed seismic reflected wavefield is a composite field composed of reflected and diffracted (scattered) waves formed by layered strata and non-layered and irregular geological bodies. The three types of wavefields exhibit different morphological characteristics in different datasets. Based on the differences in wavefield morphology, this study, using a technique for separating layered and random wavefields based on an image-guided, sparse-constrained parabolic Radon transform in the frequency domain, decomposed high signal-to-noise-ratio data of complex reflected wavefields, which had undergone migration processing or not, into a reflected wavefield with infinite lateral extent and a diffracted (scattered) wavefield of irregular geological bodies with limited lateral extent. This technique provides a foundation for the direct prediction and investigation of irregular reservoirs and has been successfully applied in both the Tarim and Ordos basins.
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