Affiliation:
1. Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. State Key Laboratory of Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China
Abstract
Shallow gas reservoirs play a crucial role in the gas hydrate system. However, the factors influencing their distribution and their relationship with the gas hydrate system remain poorly understood. In this study, we utilize three-dimensional seismic data to show the fluid pathways and shallow gas reservoirs within the gas hydrate system in the Qiongdongnan Basin. From the deep to the shallow sections, four types of fluid pathways, including tectonic faults, polygonal faults, gas chimneys, and gas conduits, are accurately identified, indicating the strong spatial interconnection among them. The gas pipes are consistently found above the gas chimneys, which act as concentrated pathways for thermogenic gases from the deep sections to the shallow sections. Importantly, the distribution of the gas chimneys closely corresponds to the distribution of the Bottom Simulating Reflector (BSR) in the gas hydrate system. The distribution of the shallow gas reservoirs is significantly influenced by these fluid pathways, with four reservoirs located above tectonic faults and polygonal faults, while one reservoir is situated above a gas chimney. Furthermore, all four shallow gas reservoirs are situated below the BSR, and their distribution range exhibits minimal to no overlap with the distribution of the BSR. Our findings contribute to a better understanding of shallow gas reservoirs and the gas hydrate system, providing valuable insights for their future commercial development.
Funder
National Natural Science Foundation of China
Sanya Science and Technology Special Fund
Hainan Provincial Natural Science Foundation of China
The Innovation Platform for Academicians of Hainan Province
Cited by
1 articles.
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