| Citation: |
Dong-ju Kang, Ying-feng Xie, Jing-an Lu, Tong Wang, Jin-qiang Liang, Hong-fei Lai, Yun-xin Fang, 2022. Assessment of natural gas hydrate reservoirs at Site GMGS3-W19 in the Shenhu area, South China Sea based on various well logs, China Geology, 5, 383-392. doi: 10.31035/cg2022025
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Assessment of natural gas hydrate reservoirs at Site GMGS3-W19 in the Shenhu area, South China Sea based on various well logs
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Abstract
To obtain the characteristics of the gas hydrate reservoirs at GMGS3-W19, extensive geophysical logging data and cores were analyzed to assess the reservoir properties. Sediment porosities were estimated from density, neutron, and nuclear magnetic resonance (NMR) logs. Both the resistivity and NMR logs were used to calculate gas hydrate saturations, the Simandoux model was employed to eliminate the effects of high clay content determined based on the ECS and core data. The density porosity was closely in agreement with the core-derived porosity, and the neutron porosity was higher while the NMR porosity was lower than the density porosity of sediments without hydrates. The resistivity log has higher vertical resolution than the NMR log and thus is more favorable for assessing gas hydrate saturation with strong heterogeneity. For the gas hydrate reservoirs at GMGS3-W19, the porosity, gas hydrate saturation and free gas saturation was 52.7%, 42.7% and 10%, on average, respectively. The various logs provide different methods for the comprehensive evaluation of hydrate reservoir, which supports the selection of candidate site for gas hydrate production testing.
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References
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Dong-ju Kang, Ying-feng Xie, Jing-an Lu, Tong Wang, Jin-qiang Liang, Hong-fei Lai, Yun-xin Fang, 2022. Assessment of natural gas hydrate reservoirs at Site GMGS3-W19 in the Shenhu area, South China Sea based on various well logs, China Geology, 5, 383-392. doi: 10.31035/cg2022025
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Figure 1.
Downhole LWD results at the site of Well W19.
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Figure 2.
Comparison of the mineral component results with ECS processing and laboratory analysis at Site W19.
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Figure 3.
Comparison of calculated grain density and density porosity using the ECS log with core analytical results.
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Figure 4.
Relationship of various porosities vs. depth at Site W19. a–comparison of neutron and NMR porosities with density porosity; b–corrected neutron porosity; c–corrected NMR porosity.
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Figure 5.
Relationship between density porosity and formation factor. The data points are from fully water-saturated sediments from seafloor to 135 mbsf. The red line is the best linear fit providing Archie,s parameters a and m.
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Figure 6.
Plot showing measured electrical resistivity (orange line), the pore-water resistivity (red line), and the background resistivity trend (blue line).
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Figure 7.
Gas hydrate/gas saturations calculated from the resistivity (a) and NMR (b) logs and their comparison (c).
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Figure 8.
Inverse intersection of density and neutron porosity logs of the gas hydrate zone.