【摘要】 本文基于海拉尔盆地贝尔凹陷西北部高精度三维地震资料,通过对时间域、频率域地震属性的分析,研究了河道砂体的变化及分布规律,总结出了一套利用时间域、频率域地震属性识别古河道的方法。其中对河道砂体较为敏感的沿层属性主要有均方根振幅、反射强度梯度、有效带宽及瞬时频度等。利用这种识别方法在该区找到水下分流河道砂体和河口坝砂体,为该区的岩性勘探部署提供了具体目标。更多还原

【Abstract】 Based on 3-D high-precision seismic data in northwest part of Be’er sag, Haila’er basin and through analyses of seismic attributes in time and frequency domains, the paper studied the variation and distributing law of channel sand bodies and summarized a set of approaches using seismic attributes in time and frequency domains to identify the palaeochannel. Among these attributes, the horizons following attributes sensitive to channel sand body mainly include mean-square-root amplitude, gradient of reflection intensity, effective bandwidth and instantaneous frequency. The underwater split-flow channel sand body and river mouth bar sand body have been found by using this identifying approach, which provided concrete objects for deployment of lithologic exploration in this region.更多还原