基于压缩感知的地震数据规则化技术在塔里木区块的应用

    Application of compressed sensing-based seismic data regularization technology in the Tarim block

    • 摘要: 塔里木盆地是中国最重要的石油勘探区之一,其盆地内沉积岩层厚,构造活动频繁,形成了大量的生油岩、储油岩和盖层,为石油等资源的生成和储存提供了良好的条件。但该地区地形起伏较大,极大地阻碍了观测系统布置和采集工程设计,同时起伏地表和地下复杂构造也对地震波的传播产生影响,从而降低地震勘探数据的质量,对数据预处理、成像及储层预测等方面造成困难。本文针对塔里木区块内由于不良采集所造成的数据缺失问题,利用压缩感知技术实现地震数据的高精度重建,希望为预处理或叠加阶段提供高完整度、高可信度和高精度的地震记录。压缩感知作为一种新型的采样技术,在数据重建领域发挥了重要作用,该理论的关键是对地震数据进行充分的稀疏表达,但Fourier和DCT等传统变换仅适用于简单的全局型构造,本文根据塔里木区块数据的高复杂型,引入Shearlet变换作为压缩感知重建的稀疏基函数并成功应用于塔里木盆地实际资料,处理结果证明所用方法在该区域具有高度准确性和适用性。

       

      Abstract: The Tarim Basin,one of China's most significant oil exploration areas,exhibits thick sedimentary rock layers and frequent tectonic movements.These characteristics have led to the formation of abundant source,reservoir,and cap rocks,creating favorable conditions for the generation and storage of resources like petroleum.However,the high topographic relief in the area poses significant challenges to observation system arrangement and acquisition engineering design.Moreover,undulating surfaces and complex subsurface structures affect the propagation of seismic waves,impairing the quality of seismic exploration data and complicating data preprocessing,imaging,and reservoir prediction.Given the data loss of the Tarim block caused by suboptimal data collection,this study conducted high-precision reconstruction of seismic data using the compressed sensing technique,aiming to provide seismic records with high integrity,reliability,and precision for the preprocessing/superimposition phase.Compressed sensing,a novel sampling technique,plays a significant role in data reconstruction.The key to this technique is the adequate sparse representation of seismic data.However,conventional transform methods like Fourier transform and discrete cosine transform(DCT) are merely applicable to simple global structures.Considering the high complexity of the Tarim block data,this study employed the Shearlet transform as the sparse basis function for data reconstruction through compressed sensing.The technology of this study was finally applied to process the actual data of the Tarim Basin,demonstrating high accuracy and applicability for the area.

       

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