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.

中文翻译：

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基于对数的岩石阿斯马里碳酸盐岩压缩率估算

岩石可压缩性在上游石油工业中有许多应用，例如与可能的地层压实和沉陷有关的储层材料平衡计算和地质力学。当无法进行岩心测量时，可能需要考虑经验相关性，这些相关性是针对特定领域得出的。在提出的研究中，研究了基于对数方法评估岩石可压缩性的适用性，目的是得出伊朗西南部Asmari碳酸盐岩的合适相关性。提出了一种基于逐步测井的岩石可压缩性确定方法，包括构造地质力学地球模型MEM。在将测井方法与岩心导出的结果进行比较时，发现基于测井方法显示了对所研究碳酸盐的孔隙可压缩性的相当可靠的估计，除了井眼冲刷非常大的时间间隔外。尽管所选择的程序与其他研究人员用于砂岩的程序类似，但在某些情况下涉及复杂的程序，但可以通过相对简单的程序获得相对较好的匹配结果。为了验证这项研究的结果，将可压缩性值与几种行业相关性进行了比较。还介绍了地层可压缩性在估算可能的地层压实和相关沉降方面的应用。但是，在这种情况下，由于研究的碳酸盐相当固结，因此显示的影响最小。总而言之，本研究为伊朗西南碳酸盐油田（Asmari碳酸盐油田）的岩石可压缩性提供了一种新的相关性，从而验证了基于测井技术的适用性。