Evaluation of Core Samples from Low-Porosity and Low-Permeability Carbonate Reservoir with NMR Experiments

doi:10.11938/cjmr20192741

Abstract

Abstract: Well logging evaluation of the low-porosity and low-permeability carbonate reservoir is difficult because of its complex mineral composition, difficult to determine rock skeleton parameters, diverse types of reservoir space, complex pore structure and pore-permeability relationship, and unobvious response characteristics of conventional logging curves. In order to quantitatively evaluate the pore structure and calculate the reservoir parameters by nuclear magnetic resonance (NMR) logging, NMR experiments on the core samples from low-porosity and low-permeability reservoir were performed. The pore structure was analyzed from the NMR data, and a T₂ cutoff value was calculated using the T₂ spectrum distribution curve. With the NMR method, the total porosity, effective porosity, bound water porosity, permeability and other reservoir parameters of the core samples were determined and compared with the results obtained with the conventional core experiments. The advantages and limitations of NMR methods in evaluating the low-porosity and low-permeability reservoirs were summarized.

Key words: low-porosity and low-permeability reservoir, carbonate, core NMR experiment, pore structure

CLC Number:

TE19

ZHU Xue-juan, ZHANG Xiang-ming, SHAN Sha-sha. Evaluation of Core Samples from Low-Porosity and Low-Permeability Carbonate Reservoir with NMR Experiments[J]. Chinese Journal of Magnetic Resonance, 2020, 37(3): 349-359.

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