频谱成像技术在泌阳凹陷深凹区储层预测中的应用

Application of frequency spectrum imaging technology on reservoir prediction in deep depressed zone of Biyang Depression

(1.黑龙江省地震工程研究院,黑龙江哈尔滨 150090；2.河南石油勘探局石油地质开发研究院,河南南阳 473132；3.河南石油勘探局地质调查处,河南南阳 473132；4.河南石油勘探局井下作业公司试油项目部,河南南阳 473132;5.中国科学院地质与地球物理研究所,北京 100029)

Heilongjiang Earthquake Engineering Research Institute,Haerbin 150090,China

针对泌阳凹陷深凹区砂岩储层厚度变化快、横向相变复杂、薄层储层精细刻画难度较大等特点,在泌204井井区应用了地震频谱成像技术,并对砂岩储层频谱成像响应特征进行了分析。阐述了频谱成像技术的基本原理,为克服离散傅里叶变换时窗长度选择上的困难,采用以小波变换为基础的时频分析技术,建立薄储层与频率之间的调谐关系。在精细层位标定的基础上,基于深凹区三维地震资料,采用分频技术生成了泌204井井区不同频段调谐频率下的地震能量数据体,并进行了薄储层分辨能力分析；然后基于地震能量数据体,进行了砂体储层的边界和空间分布检测,提出了有利目标区。预测结果与实际地质情况较为吻合。

The sand reservoirs has fast variable thickness and complex variable lateral facies at deep depressed zone in Biyang Depression,so it is difficult to fine describe the thin reservoirs.Aiming at the problems,we applied frequency spectrum imaging technology to Bi204 well area to analyze the frequency spectrum imaging response characteristics of sand reservoir.After introducing the principles of frequency spectrum imaging technique,in order to avoid the difficulty of selecting the window length for discrete Fourier transform,the wavelet transform based time-frequency analysis technique was adopted to obtain the tuning relationship of frequency and thin reservoirs.In Bi204 well area,based on fine horizon calibration,frequency division technique was utilized to 3-D seismic data for generating seismic energy data volume with tuning frequency in different frequency band and analyzing the identification ability for thin reservoirs.Then,based on seismic energy data volume,the boundary of sand reservoirs was identified and its spatial distribution was detected,potential area was proposed.The predicted results are coinciding with actual geologic conditions.