基于稀疏约束频率域抛物线Radon变换的波场分解

doi:10.11720/wtyht.2024.0059

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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。

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关键词 ：波场分解, 非规则储集体, 缝洞体, 储层预测, 拉东变换

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.

Key words： wave field decomposition irregular reservoir vuggy-fractured body reservoir prediction Radon transform

收稿日期: 2024-02-20 修回日期: 2024-08-13 出版日期: 2024-12-20

ZTFLH:

P631.4

基金资助:中石化科技部项目“超深碳酸盐岩断控储集体地震波场特征及反演研究”(P22147)

引用本文:

张永升, 张荣, 樊易, 张安家, 李英才. 基于稀疏约束频率域抛物线Radon变换的波场分解[J]. 物探与化探, 2024, 48(6): 1653-1663.
ZHANG Yong-Sheng, ZHANG Rong, FAN Yi, ZHANG An-Jia, LI Ying-Cai. Wavefield decomposition based on sparse-constrained parabolic Radon transform in the frequency domain. Geophysical and Geochemical Exploration, 2024, 48(6): 1653-1663.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.0059 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I6/1653

Fig.1 塔里木盆地含有非规则地质异常体地震波场特征典型剖面

Fig.2 三层地质+非规则异常体(溶洞)模型正演

Fig.3 起伏风化面+非规则异常体(溶洞)模型正演

Fig.4 溶洞高度和宽度对串珠形态影响的正演模拟

Fig.5 高度15 m、宽度10~600 m溶洞的绕射波振幅曲线

Fig.6 溶洞绕射波偏移后短轴反射波的宽度与溶洞宽度相关性分析

Fig.7 从共成像点道集数据中分解出的层状反射和噪声

Fig.8 基于波形差异的波场分离实现步骤

Fig.9 波场分解消去层状反射后凸显了非规则异常体

Fig.10 波场分解在塔里木盆地奥陶系碳酸盐岩地层中缝洞地震反射串珠特征应用

Fig.11 波场分解在塔里木盆地顺托果勒地区断控缝洞体的应用

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