Fine mapping of geological structure in 416a-417 area of Algeria

The 416a-417 area locates in the central north of Algeria with a low prospecting degree. On the basis of 2-D data quality analysis, effective seismic section polarity discrimination and fine stratum calibration method were adopted to realize detailed structure interpretation. In the process of mapping, several methods are utilized, which are conventional time-depth conversion, error correlation analysis, and variable velocity mapping method. The actual application shows that the common constant velocity mapping method can only show the approximate structure shape of the area with a very low precision. In addition, it can’t exactly characterize the geological rules and the complex structure forms. In the absence of regional velocity field, error correlation analysis can truly describe the areal structure characteristics and trap shape. The variable velocity mapping method can show geological structure belt, trap area and structure relief in detail. Therefore, it can ensure the precision and accuracy of structure mapping.