从弹性和岩石物性参数评价岩石可钻性

Mostafa A. Teama, Mohamed A. Kassab, Moataz M. Gomaa, Abdelrahman B. Moussa
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引用次数: 0

摘要

岩石强度是岩石钻井、开挖和成本评估中必不可少的有效指标。这项工作旨在研究一种实用的方法,通过利用一些岩石物理参数(孔隙度和体积密度)和弹性特性(杨氏模量、体积模量和慢度)来评估控制岩石可钻性的地质力学特性,如单轴抗压强度(UCS)。为了实现这一目标,研究人员对埃及北西奈Gebel El-Maghara不同地区的侏罗纪岩石样本进行了取样。通过测量28个砂岩和89个碳酸盐岩塞的孔隙度,计算了单轴抗压强度(UCS)。给出了砂岩和碳酸盐岩的单轴抗压强度与物理性质和弹性性质之间的经验方程。从测井数据(声波、密度、中子和伽马射线测井)中测量的物理和弹性参数可以在其他未来的研究中使用,通过在本研究中推断的这些经验方程来预测岩石的强度。本研究的UCS计算结果与以往研究中收集的世界各地不同类型沉积岩的室内岩石强度关系比较,显示出较高的相容性。砂岩的回归分析估计方程比碳酸盐岩更适用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The assessment of rock drillability from elastic and petrophysical parameters
ABSTRACT Rock strength is an essential and effective property in the rock drilling, excavation, and cost evaluation. This work aims to examine a practical approach to evaluate the geomechanical properties that control rock drillability, such as uniaxial compressive strength (UCS) by utilising some petrophysical parameters (porosity and bulk density) and elastic properties (Young’s modulus, bulk modulus, and slowness). To achieve this aim, the study was conducted on some Jurassic rock samples that were cored from different localities in Gebel El-Maghara, North Sinai, Egypt. The uniaxial compressive strength (UCS) was calculated from the measured porosity of 28 sandstone and 89 carbonate plug samples. Empirical equations that relate the uniaxial compressive strength of sandstone and carbonate rocks to physical properties and elastic properties are represented. The physical and elastic parameters that were measured from logging data (sonic, density, neutron, and gamma-ray logs) can be utilised in other future studies to predict the strength of the rock by using these empirical equations that were inferred in this study. The comparison between the relationships of calculated results of UCS in this study with the relationships of laboratory rock strength of different types of sedimentary rocks collected from different places around the worldfrom the previous studies shows high compatibility. The estimated equations from regression analysis of sandstone are more recommended than carbonate.
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