拟声波重构技术在大民屯凹陷储层预测中的应用

大民屯凹陷沙四段储层主要为扇三角州沉积,近源混杂堆积、纵向厚度大,相带及岩性变化快,含油气井段长、差异大;地震资料分辨率低,声波测井曲线不能直接反映储层特征,常规地震反演很难识别砂砾岩的有利储层。针对上述问题,首先对地震资料进行了高分辨率处理,以满足后续地震反演的需求;然后对测井资料进行了预处理和敏感性分析;最后利用基于小波变换的拟声波重构技术构建拟声波曲线,并用拟声波曲线进行了地震反演研究。实际应用效果表明,拟声波重构技术可以明显提高储层预测的分辨率和精度,准确地刻画沙四下亚段砂砾岩体的有利储层。

Application of quasi-acoustic reconstruction technology in reservoir prediction of Damintun sag

The 4~(th) member of the Shahejie formation in Damintun sag is mainly of a fan-delta sedimentation,with characteristics of mixed accumulation near source, large longitudinal thickness, fast change of facies zone and lithology, long oil-gas well segment and large difference. Due to the low resolution of seismic data, the acoustic logging curve cannot directly reflect reservoir characteristics, and the conventional seismic inversion is difficult to identify the favorable reservoir of conglomerate. Aiming at the problems mentioned above, the seismic data are processed with high resolution in order to meet the requirements of subsequent seismic inversion, and then the preprocessing and sensitivity analysis of logging data are carried out. Finally, the pseudo-acoustic reconstruction technique based on wavelet transform are used to construct the pseudoacoustic curve, and the pseudo-acoustic curve is used for seismic inversion research. The actual application results show that the quasi-acoustic reconstruction technology can significantly improve the resolution and accuracy of reservoir prediction, accurately depict the favorable reservoir of sandy gravel mass in the lower section of the 4~(th) member of Shahejie formation.