103 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 4 Tying surface seismic data 6 J.-L. Mari, P. Meynier 4.1 Introduction Conventionally, surface seismic surveys provide sub-surface images in time in two or three dimensions (2D or 3D). Well measurements are data obtained as a function of depth. VSP-type well seismic surveys provide both time images (VSP sections) comparable to those obtained by surface seismic surveys, and surveys (velocity for example) in depth, comparable to those obtained by logging measurements (for example, acoustic logging). The comparison of measurements in depth (acoustic logging) and measurements in time requires time or depth conversion of one of the two datasets. This chapter of Well seismic surveying and acoustic logging is published under Open Source Creative Commons License CC-BY-NC-ND allowing non-commercial use, distribution, reproduction of the text, via any medium, provided the source is cited. © EDP Sciences, 2018 DOI: 10.1051/978-2-7598-2263-8.c006
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