Authors
Hao Xu, Dazhen Tang, Junlong Zhao, Song Li
Publication date
2015/3/1
Journal
Fuel
Volume
143
Pages
47-54
Publisher
Elsevier
Description
Porosity is one of the most fundamental hydrocarbon-reservoir properties for the exploration and development of shale gas. Low-field nuclear magnetic resonance (NMR) is considered a quick and effective means for quantitative microstructural characterization, and it has been widely applied to test the porosity of tight reservoirs. However, previous investigations of the two key parameters (the echo time and the waiting time) for shale NMR-porosity measurements have presented conflicting results. To improve the accuracy of low-field NMR-porosity measurements, shale samples collected from the Linxing area, eastern margin of the Ordos Basin, were measured using both a helium (He) porosity measurement and an NMR porosity technology for various waiting times and echo times, and subsequently using the He porosity as a benchmark, the uncertainty of the test condition and the relative error between the NMR …
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