三维可视化地震相分析在沉积相研究中的应用

波形分类主要适用于地层厚度相近、构造比较简单的地区。对于吉林探区，利用地震波形分类可识别厚10-15m的砂层组，分类的数目要参考研究区目的层段的沉积微相种类，迭代次数以20-30次为宜。在吉林探区大老爷府地区青山口组一段沉积相分析中，将地震道波形特征划分为比较典型的6类，通过精细标定联井剖面，从标准层向下开时窗16ms得到水进无井区存在水下分流河道砂体，可形成岩性油藏。波形分类充分利用三维地震资料包含的地质信息，能有效提高井间和无井区微相划分的精度，解决微相分布和组合问题，能满足勘探阶段研究沉积微相和隐蔽油气藏的需要。

Waveform classification seismic facies analysis in sedimentary facies research

Waveform classification mainly adapts to areas with similar stratigraphic thickness and relatively simple structural features. In Jilin, 10-15m sandstone groups can be distinguished by waveform classification. The features of seismic waveform channels can be classified into 6 typical types in No.1 section of Qingshankou Formation in Dalaoyefu region, Jilin area. The seismic microfacies map of 4^th sequence of transgressive system tract can be obtained by opening 16ms time window downward from standard layer through fine well section calibration. The shape of delta lope in main construction is very clear, the distributary channels are branched in no-well region to the SW and NE of the work area in the seismic microfacies map, so the distributary river sandbodies can be forecasted in the no-well region which can form lithologic reservoir. Waveform classification can effectively improve prediction precision of sedimentary facies between wells and in no-well region.