Log-based rock compressibility estimation for Asmari carbonate formation
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Log‑based rock compressibility estimation for Asmari carbonate formation Rahman Ashena1 · Peter Behrenbruch1 · Ali Ghalambor2 Received: 19 December 2019 / Accepted: 11 June 2020 © The Author(s) 2020
Abstract Rock compressibility has many applications in the upstream petroleum industry, for example, reservoir material balance calculations and geomechanics, as related to possible formation compaction and subsidence. When measurements on core are not available, empirical correlations may need to be considered, derived for specific fields. In the study presented, the suitability of the log-based method for evaluating rock compressibility is investigated, with the aim of deriving a suitable correlation for Asmari carbonate, Southwest Iran. A stepwise log-based method of rock compressibility determination is presented, including the construction of a geomechanical earth model, MEM. In comparing a log approach with core-derived results, it was found that the log-based method showed a rather reliable estimation of pore compressibility for carbonates studied, except for intervals with extremely large wellbore washout. Although the selected procedure is similar to that used for sandstone by other researchers, involving in some cases complex procedures, a relatively good matching result could be obtained with a relatively simple procedure. To validate the results from this study, a comparison of compressibility values is made with several industry correlations. An application of formation compressibility for estimating possible formation compaction and associated subsidence is also presented. However, a minimal effect is indicated in this case, as the carbonates studied are rather consolidated. In summary, this study presents a new correlation for rock compressibility for Southwestern Iranian carbonate oilfields (Asmari carbonate), validating the applicability of a log-based technique. Keywords Rock compressibility · Log-based estimation · Geomechanical approach
Introduction Rock compressibility is a significant parameter in reservoir studies, for example, material balance as related to estimating (remaining) reserves. Another application involves the prediction of possible formation compaction and associated surface subsidence, a complex geomechanical problem. Rock compressibility has also application in well completions and associated sand control operations (Ghalambor et al. 1994). Core-based compressibility measurements, especially for consolidated rock, are always the first choice. However, when such data are not available, alternative techniques need to be considered. This study presents an investigation of a cost-effective log-based method of compressibility estimation for Asmari * Rahman Ashena [email protected] 1
Bear and Brook Consulting, Brisbane, Australia
Oil Center Research International, Louisiana, USA
2
carbonate formation. The approach is validated by comparison with core-derived measurements. Compressibility results were also used to evaluate the
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