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Monitoring Lithology Variations in Drilled Rock Formations Using NMR Apparent Magnetic Susceptibility Contrast
Applied Magnetic Resonance ( IF 1 ) Pub Date : 2020-02-06 , DOI: 10.1007/s00723-019-01157-1
Jonathan Mitchell

Nuclear magnetic resonance (NMR) is a powerful technique for determining the petrophysical properties (porosity, permeability, and fluid mobility) of subsurface reservoirs through well logs, laboratory core analysis, or surface measurements of drill cuttings at the rig site. In well logging, NMR is considered a lithology-independent tool, but in surface measurements, it is possible to determine the apparent magnetic susceptibility contrast between the rock and a saturating liquid from a measure of the free induction decay. The magnetic susceptibility of the rock is influenced by paramagnetic minerals (iron and manganese oxides) and provides a simple method for detecting variations in lithology, particularly shale bands. Here, NMR measurements of apparent magnetic susceptibility contrast are obtained on a selection of core plugs, powdered rock, and drilled cuttings using a commercial bench top instrument, and shown to correlate to the iron content of the samples. This rapid and robust analysis complements the standard NMR petrophysical measurements and could be used to detect formation tops in near-real-time at the rig site.

中文翻译:

使用 NMR 表观磁化率对比监测钻孔岩层的岩性变化

核磁共振 (NMR) 是一种强大的技术,可通过测井、实验室岩心分析或钻井现场钻屑的表面测量来确定地下储层的岩石物理特性(孔隙度、渗透率和流体流动性)。在测井中,核磁共振被认为是一种独立于岩性的工具,但在地表测量中,可以通过测量自由感应衰减来确定岩石和饱和液体之间的表观磁化率对比。岩石的磁化率受顺磁性矿物(铁和锰的氧化物)的影响,为检测岩性,尤其是页岩带的变化提供了一种简单的方法。在这里,对选定的岩心塞、粉状岩石、和使用商用台式仪器钻出的岩屑,并显示与样品的铁含量相关。这种快速而可靠的分析补充了标准的 NMR 岩石物理测量,可用于在钻井现场近乎实时地检测地层顶部。
更新日期:2020-02-06
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