OVT域优势道集在煤田地震异常构造精细探测中的应用

Application of Dominant Seismic Data in OVT Domain to Fine Detection of Seismic Anomalies in Coal Fields

在煤田地震精细勘探中,陷落柱等异常构造精细勘探是一项重要的地质任务,结合当前OVT技术,对“两宽一高”高密度地震道集进行OVT处理,对存在陷落柱异常的CMP面元所对应的螺旋道集及其共方位角叠加数据体进行五维解释,根据道集上目的层走时、时差切片、振幅切片统计该异常的优势方位以及有效偏移距信息。使用统计所得的优势方位及偏移距参数构造优势数据体,用该数据体对陷落柱进行解释,在成像剖面上陷落柱成像更清楚,同相轴错段的边界更加清晰。

In the fine seismic exploration of coal fields,the fine exploration of abnormal structures such as subsidence column is an important geological task.Combined with the current OVT technology,this paper carries out OVT processing on the"Wide-azimuth,Broadband and High-density"seismic trace set,and interprets the spiral trace set corresponding to the CMP plane element with the abnormal subsidence column and its common azimuth superposition data volume in five dimensions.According to the travel time,time difference slice and amplitude slice of the destination layer on the track set,the dominant orientation and effective offset information of the anomaly were counted.The dominant position and offset parameters obtained by statistics are used to construct the dominant data body,which is used to interpret the collapse column,and the image of the collapse column is clearer in the imaging profile and the boundary of the in-phase axis is more clear.