利用核磁共振资料定量评价页岩孔隙结构
收稿日期: 2020-09-21
网络出版日期: 2020-11-06
基金资助
国家科技重大专项(2016ZX05034-004);中国地质调查局资助项目(DD20201172)
Quantitative Evaluation of Shale Pore Structure Using Nuclear Magnetic Resonance Data
Received date: 2020-09-21
Online published: 2020-11-06
孟昆 , 王胜建 , 薛宗安 , 侯瑞卿 , 肖亮 . 利用核磁共振资料定量评价页岩孔隙结构[J]. 波谱学杂志, 2021 , 38(2) : 215 -226 . DOI: 10.11938/cjmr20202856
The pore structure of shale gas reservoir is complex and heterogeneous, leading to great challenges in reservoir characterization and effectiveness evaluation. In order to establish a quantitative evaluation method for pore structure of the shale gas reservoir, 20 cores of the second member of Doushantuo Formation in Yichang area, western Hubei were selected as the experimental sample. An echo interval of 0.069 ms was used to carry out nuclear magnetic resonance (NMR) experiments under 100% salt water saturation. The obtained T2 spectra were analyzed with the multifractal characteristics method, and the parameters sensitive to the pore structure of the shale reservoirs were extracted. A method and a standard to classify shale reservoir types were developed, based on the minimum and maximum generalized fractal dimension difference (Dmin-Dmax) and spectral width (Δα). This method is of great significance for improving the prediction accuracy of shale gas reservoirs and guiding development and selection.
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