3-D seismic survey is recognized as a very powerful exploration tool and the usage is widely made to obtain clearer subsurface images. However, there is the case in which the acquisition of 3-D seismic data is not allowed economically or in exploration strategy. In such a case only existing 2-D data give the subsurface information. However, the interpretation of multi-line 2-D seismic data is always ambiguous under the complex geological structure. The main reason is that the sideswipe reflections are not separated on single 2-D seismic data. The only way to improve the interpretation accuracy is that the sideswipe energy contained in multi-line 2-D data set is located in the correct reflection position and shapes the reflector image by means of 3-D pre-stack depth migration (PSDM). Our final goal of the study is to obtain a 3-D subsurface image from multi-line 2-D seismic data by means of 3-D PSDM. The critical issue of the approach is that the subsurface spatial sampling is too sparse to obtain a meaningful PSDM image. Therefore, the elaborated interpretation technique is necessary to compensate the lack of spatial sampling. In this paper we will discuss an interpolation technique to produce a pseudo 3-D data set from sparse multi-line 2-D data using t-x-y domain operator.


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