Experimental investigation of effects of mica content, Fe and pressure on the pore size distribution and permeability of sandy sediment using proton nuclear magnetic resonance

Kimura, Sho; Noda, Shohei; Minagawa, Hideki

doi:10.1016/j.enggeo.2021.106408

Cited by 8 publications

(1 citation statement)

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“…The SR of shales is influenced by many factors, such as pore geometry, mineralogical compositions, and magnetic susceptibility. Until now, numerous approaches have been established to capture the SR of reservoir rocks, which are summarized in Table . − At present, the most common approach is to appropriately match the T 2 distribution with the pore size distribution or S / V obtained by other approaches, such as MIP, N 2 , and centrifugation. However, none of them is universally accepted due to the reasoning mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Determining Nuclear Magnetic Resonance Surface Relaxivity of Shales

2023

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Nuclear magnetic resonance, as an extensively recognized technique, is utilized to measure the pore size distribution of shales. However, the pore size distribution interpreted by nuclear magnetic resonance noticeably relies on the surface relaxivity (SR) of shales, which is influenced by many factors, including the measurement approach and mineralogical compositions. This paper chiefly deals with two approaches to measuring the surface relaxivity of shales based on a one-dimensional relaxation model. In continuing, the effects of mineralogical compositions and measurement approaches on the surface relaxivity of shales are methodically assessed. The surface relaxivity of shales is measured to be 1.34–2.59 μm/s by the spin echo approach and 1.40–2.44 μm/s based on the Carr–Purcell–Meiboom–Gill approach. Compared with the nitrogen adsorption approach, the suggested methods are more suitable for measuring the SR of shales. The achieved results reveal that the shale SR is negatively correlated with quartz and calcite and is positively correlated with pyrite and clay. In particular, the clay content seems to be the most vital mineral factor in determining the SR of shales.

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