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Successful use of image logs for sidewall core orientation from field to laboratory
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fourth EAGE Borehole Geology Workshop, Sep 2021, Volume 2021, p.1 - 5
Abstract
Summary
The presented e-SWCG (SideWall Core Goniometry) workflow is dedicated to deliver a complete a posteriori orientation of the rotary sidewall cores (RSWC), allowing several applications, such as geomechanical tests, permeability anisotropy and natural fracture evaluation, previously reserved to larger size samples taken from bottom hole cores. The method is based on the identification of geological features recognizable on 360° unrolled X-Ray CT image and at the well scale on the image logs. This approach is currently adopted in Eni for different geological environments and requires several scenarios of log planning strategy, operational solutions and post-coring procedures, in order to maximize the quality of the subsequent analyses. The presented case studies involve two wells very different in terms of lithology, borehole environment and, more importantly, a priori knowledge of the RSWC orientation. Particularly, one case history on carbonates shows the reliability of the procedure even with limited available data. On the other hand, the other case on a clastic reservoir emphasizes the advantages of using coring tools to achieve greater control on RSWC positioning. Both case histories successfully provided the correct parameters to orient the physical rock samples.
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