基于连续小波分频纹理属性精确刻画沉积相——以准噶尔盆地五八区块百口泉组为例

Precise Characterization of Sedimentary Facies Based on Continuous Wavelet Frequency Division Texture Attributes——A Case Study of the Baikouquan Formation in the Zhongguai 58 area,Junggar Basin

利用各种地震属性划分地震相已成为现阶段油气勘探的一种常用方法,单一属性或地震数据对地震相边界的识别能力有一定的局限性,因此可以通过时频分析等方法拆分出多个频带的地震数据,优选反映地震相边界的频带,从而清晰刻画地震相。在准噶尔盆地五八区利用测井和地震资料,建立了百口泉组沉积相与地震相之间的对应关系模板,利用拓频分频方法结合纹理属性识别地震相。研究发现,在地震资料主频附近的分频纹理属性可较为准确刻画沉积相边界,中高频纹理属性可较为准确地刻画百口泉组三角洲前缘及三角洲平原的演化过程,分析结果与井上吻合度较高。

Using various seismic attributes to divide seismic facies has become a common method for oil and gas exploration at this stage. Single attribute or seismic data has certain limitations on the recognition ability of seismic facies boundaries. Therefore, seismic data of multiple frequency bands can be separated by time-frequency analysis and other methods, and the frequency bands reflecting seismic facies boundaries can be optimized, so as to clearly depict seismic facies. The corresponding relationship template between sedimentary facies and seismic facies of Baikouquan Formation has been established by using logging and seismic data in Zhongguai58 area, Junggar Basin, and seismic facies has been identified by using extension frequency division method combined with texture attributes. It is found that the frequency division texture attribute near the main frequency of seismic data can more accurately depict the boundary of sedimentary facies, and the medium and high frequency texture attribute can more accurately describe the evolution process of the delta front and delta plain of the Baikouquan Formation, and the analysis results are in good agreement with the well.