利用标准层声波时差异常法确定断层位置

PREDICTION OF FAULT LOCATION BY ACCOUSTIC ABNOMALITY IN STANDARD LAYER

在用标准层声波时差异常法确定断层的位置时，首先对标准层声波时差进行趋势面分析，然后再分析残差等值线图。当区内无断层时，残差等值线无局部异常，呈随机分布；当区内有断层时，可出现局部异常，其等值线的零线位置就是断层的位置。实际应用表明，该方法对研究油区构造有一定的参考价值。

The process for predicting fault location by using accoustic abnomality in standard layer includes two stages. First, a trend analysis about accoustic log data in standard layer is done. Second, residual error contour map is output, and much more information can be taken from it. Two cases are discussed. The first one is the case without fault in the area. In this case, there is no abnomality in the residual error contour map and all error are random. The second one is the case of existance of faults in the area. In this case there is local abnomality in the residual error contour map. It is concluded that the zero line in the map is the location of fault. This method has yielded good result, and it is helpful for structure analysis in oilfield.