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True stratigraphic thicknesses calculation and fault throw evaluation based on image log interpretation during geosteering on horizontal well of Y.Korchagin field (Caspian Sea)
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Horizontal Wells 2021, May 2021, Volume 2021, p.1 - 6
Abstract
Summary
Horizontal wells bring a lot of new practices in way of working with well data. For example, in the petrophysical interpretation of reservoir properties, 3D approach is used that allows us to take into account the effect of several layers simultaneously affecting on LWD measurement [ 3 ]. Geosteering team always shifts from measuring thicknesses (MT) to true stratigraphic ones (TST) by adjusting trajectories based on formation dips. During interpretation wellplacement engineers uses relable stratigraphic well tops to adjust formation dips for achieving better correlation with surrounding wells [ 1 , 4 ] (Figure 1). For understanding of formation dips LWD borehole images or deep-reading electromagnetic measurements are used. A new method of using borehole images interpretation for TST calculation, which allows to build more accurate geosteering model described in this article.
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