Well-Logging Constraints on Gas Hydrate Saturation in Unconsolidated Fine-Grained Reservoirs in the Northern South China Sea

Xiaoming Wan, Xueqing Zhou (), Jinqiang Liang, Shiguo Wu, Jingan Lu, Chenglong Wei, Rui Wang and Bo Liu ()
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Xiaoming Wan: Haikou Marine Geological Survey Center, Chinese Geological Survey, Haikou 571127, China
Xueqing Zhou: Laboratory of Marine Geophysics and Georesources, Institute of Deep-Sea Science and Engineering, China Academy of Sciences, Sanya 572000, China
Jinqiang Liang: Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, China
Shiguo Wu: Laboratory of Marine Geophysics and Georesources, Institute of Deep-Sea Science and Engineering, China Academy of Sciences, Sanya 572000, China
Jingan Lu: Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510075, China
Chenglong Wei: Haikou Marine Geological Survey Center, Chinese Geological Survey, Haikou 571127, China
Rui Wang: Haikou Marine Geological Survey Center, Chinese Geological Survey, Haikou 571127, China
Bo Liu: School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China

Energies, 2022, vol. 15, issue 23, 1-22

Abstract: Recently, drilling wells have encountered rich gas hydrates in fine-grained sediments in the northern South China Sea. Gas hydrate in fine-grained sediments is very heterogeneous, and its physical properties are different from those of oil and gas reservoirs. The reliability of the classical logging saturation evaluation models established for diagenetic reservoirs is questionable. This study used four wells in GMGS3 and GMGS4 to evaluate the effects of the application of three typical methods for evaluating saturation with different principles in the unconsolidated fine-grained sediments: nuclear magnetic logging, sigma logging, and the Archie formula. It was found that the value of the lithologic capture cross-section in sigma logging and the rock’s electrical parameters in the Archie formula affect the accuracy of the model. Therefore, to obtain a reliable saturation value for fine-grained sediments, an innovative method for the calculation of resistivity and acoustic time is proposed to estimate gas hydrate saturation based on logging data, which is most consistent with the results of core analysis. The overall relative error of the verification well was 5.87%, whereas that of the density NMR logging method was 56%, showing that the accuracy of the newly proposed resistivity DT logging method’s saturation formula was significantly improved. Finally, a new model-based cross chart was developed, which can rapidly differentiate gas saturation during drilling.

Keywords: gas hydrates; well log; gas hydrate saturation; resistivity and acoustic time calculation method; South China Sea (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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