ISSN 1004-4140
CN 11-3017/P
李洋森, 秦德文, 刘庆文, 等. 基于同步压缩匹配追踪的砂体尖灭点识别研究[J]. CT理论与应用研究(中英文), 2024, 33(5): 1-10. DOI: 10.15953/j.ctta.2024.001.
引用本文: 李洋森, 秦德文, 刘庆文, 等. 基于同步压缩匹配追踪的砂体尖灭点识别研究[J]. CT理论与应用研究(中英文), 2024, 33(5): 1-10. DOI: 10.15953/j.ctta.2024.001.
LI Y S, QIN D W, LIU Q W, et al. Research on the Identification of Sandstone Vanishing Points Based on Synchronous Compression Matching Pursuit Method[J]. CT Theory and Applications, 2024, 33(5): 1-10. DOI: 10.15953/j.ctta.2024.001. (in Chinese).
Citation: LI Y S, QIN D W, LIU Q W, et al. Research on the Identification of Sandstone Vanishing Points Based on Synchronous Compression Matching Pursuit Method[J]. CT Theory and Applications, 2024, 33(5): 1-10. DOI: 10.15953/j.ctta.2024.001. (in Chinese).

基于同步压缩匹配追踪的砂体尖灭点识别研究

Research on the Identification of Sandstone Vanishing Points Based on Synchronous Compression Matching Pursuit Method

  • 摘要: 砂体尖灭的刻画是构造岩性复合圈闭有效性评价的关键,而受地震资料带限影响难以准确识别砂体的尖灭位置。为了有效解决地震剖面上尖灭识别不准的问题,本文创新引入同步压缩匹配追踪时频分辨率和能量聚焦性双重优势开展砂体尖灭识别研究。首先利用时频域褶积算子与初始模型约束构建匹配追踪的冗余字典,在时频域内筛选出所有可能的匹配原子构成备选原子库;将初始模型约束与时频域联合反演方法引入反演框架,可获得更精确的反演结果;再利用同步压缩匹配追踪变换,通过逐道分析提取优势频率,筛选时频瞬时谱,得到具有最优频率的单频谱剖面。对所提方法进行的二维模型及实际资料的测试,结果表明,基于同步压缩匹配追踪的高分辨率地震谱分解砂体尖灭点识别方法能够获得更丰富的时频域信息,得到最优频率的单频谱剖面,进而精确识别地下地质体尖灭位置。该方法对超覆型及削蚀型岩性圈闭尖灭线的刻画具有重要的借鉴意义。

     

    Abstract: The portrayal of sand cusp extinction is the key to evaluating the effectiveness of tectonic-lithological composite confinement, and it is difficult to accurately identify the location of sand cusp extinction due to the influence of seismic data band limitations. In order to effectively solve the problem of inaccurate identification of cusp extinction on seismic sections, this paper innovatively introduces the dual advantages of time-frequency resolution and energy focusing of synchronous compression match tracing to carry out the sand-cusp extinction identification research. Firstly, the time-frequency domain pleated-product operator is used to construct the redundancy dictionary of match tracing with the constraints of the initial model, and all the possible matching atoms are screened out to form the alternative atom bank in the time-frequency domain. The initial model constraints and the time-frequency domain joint inversion method are introduced into the inversion framework, which can obtain more accurate inversion results. Then, the dominant frequencies are extracted by channel-by-channel analysis using the simultaneous compressive match-tracking transform, and the time-frequency transient spectra are screened to obtain the single-frequency spectral profile with the optimal frequencies. The two-dimensional model and actual data testing of the proposed method show that the high-resolution seismic spectral decomposition sand-cusp identification method based on synchronous compression and matching tracking can obtain richer time-frequency domain information and get the single-frequency spectral profile with the optimal frequency, thus accurately identifying the location of cusps of subsurface geological bodies, which is of great significance for the depiction of cusps of overburden-type and erosion-type lithological confinement.

     

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