Citation: | Pi-bo Su, Wei Wei, Yun-bao Sun, Yao-yao Lü, Huai Cheng, Wei-feng Han, Wei Zhang, Jin-qiang Liang, 2024. Geological reservoir and resource potential (1013 m3) of gas hydrates in the South China Sea, China Geology, 7, 422-444. doi: 10.31035/cg2024069 |
A detailed understanding of the distribution and potential of natural gas hydrate (NGHs) resources is crucial to fostering the industrialization of those resources in the South China Sea, where NGHs are abundant. In this study, this study analyzed the applicability of resource evaluation methods, including the volumetric, genesis, and analogy methods, and estimated NGHs resource potential in the South China Sea by using scientific resource evaluation methods based on the factors controlling the geological accumulation and the reservoir characteristics of NGHs. Furthermore, this study compared the evaluation results of NGHs resource evaluations in representative worldwise sea areas via rational analysis. The results of this study are as follows: (1) The gas hydrate accumulation in the South China Sea is characterized by multiple sources of gas supply, multi-channel migration, and extensive accumulation, which are significantly different from those of oil and gas and other unconventional resources. (2) The evaluation of gas hydrate resources in the South China Sea is a highly targeted, stratified, and multidisciplinary evaluation of geological resources under the framework of a multi-type gas hydrate resource evaluation system and focuses on the comprehensive utilization of multi-source heterogeneous data. (3) Global NGHs resources is n×1015 m3, while the NGHs resources in the South China Sea are estimated to be 1013 m3, which is comparable to the abundance of typical marine NGHs deposits in other parts of the world. In the South China Sea, the NGHs resources have a broad prospect and provide a substantial resource base for production tests and industrialization of NGHs.
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Global overview of the distribution of natural gas hydrates (modified from Waite WF et al., 2020)
Gas sources of discovered gas hydrates in the world (modified from Dai JX et al., 2014)
Gas migration channels of natural gas hydrate.
Gas hydrate storage and production modes in different reservoir types within the stability zone
Variation of sediment components at station W17B in Shenhu area
Variation of detrital mineral species and content at station W01B-18 in Qiongdongnan area
Seismic response characteristics of pore-filled hydrate (modified by Wang XJ et al., 2014b)
Seismic response characteristics of fracture-filled hydrate (modified from Rai N et al., 2020).
Distribution and logging characteristics of gas hydrate reservoirs at SH7 station in Shenhu area
Seismic profile and LWD curve at station W08-2018 in the Qiongdongnan Sea area.
Well logging curve of W16 station and distribution map of hydrate layer in Dongsha area (modified from Liang JQ et al., 2016).
Volume method for the evaluation of resources.
Genetic method for the evaluation of resources.
Evaluation parameters of scale areas.