Summary A novel technique to predict porosity from mechanical specific energy (MSE), as measured using a downhole drilling dynamics tool, is proposed. The method is based on the fundamental conservation of energy principle and uses rock physics to establish a relationship between the drillability of a rock, its lithological properties, and its porosity. This new technique is particularly useful for formation evaluation of carbonate reef reservoirs drilled using the pressurized mud cap drilling (PMCD) technique. Under these conditions, the near-wellbore formation is often deeply invaded by drilling fluids and cuttings, which make interpretation of conventional logs unreliable and difficult. Since drilling measurements are relatively unaffected by this invasion, porosity determinations from MSE can provide a valuable supplement to conventional logging suites.

中文翻译：

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利用钻井参数计算的机械比能估计碳酸盐岩地层孔隙度

总结 提出了一种根据机械比能 (MSE) 预测孔隙度的新技术，该技术使用井下钻井动力学工具进行测量。该方法基于能量守恒的基本原理，并利用岩石物理学来建立岩石的可钻性、岩性和孔隙度之间的关系。这种新技术对于使用加压泥顶钻 (PMCD) 技术钻探的碳酸盐礁储层的地层评价特别有用。在这种情况下，近井地层经常被钻井液和岩屑深度侵入，这使得常规测井解释不可靠和困难。由于钻井测量相对不受这次入侵的影响，