The Gas Hydrate Resources in the China Seas

Abstract

Abstract:

The forming conditions of gas hydrate in the China seas according to the physical oceanography, palaeo-climate, sedimentary environment,and tectonic environment are discussed in this paper.The researching results show that the organism producibility is high and there are rich organic matters in sediments of the period 2，4，6 of oxygen-isotope in the South China Sea. In these periods the sedimentary velocity was very high, and there are very good material conditions for the formation of gas hydrate. In addition, since Pliocene, the Philippine Sea plate has collided with Asian plate in Taiwan area, extruding the northeast part of the South China Sea along northwest direction. Owning to the extruding force in the sediments the fluid is very active and it is benefit for the formation of the gas hydrate. We have collected the sedimentary samples containing the gas hydrates through the drilling on the northern slope of the South China Sea in 2007. In the Okinawa Trough of the East China Sea, some mud volcanoes or mud diapir structures and the active faults were found in the west slope of the trough. The sedimentary rates are high in Quaternary in the trough,from 10 cm/ka to 40 cm/ka. The BSRs in the seismic profiles show that there should exist the gas hydrates in the Okinawa Trough. For above reasons, we infer that gas hydrates are rich in the China seas.

Key words: gas hydrate, BSR, resource, sedimentary environment, tectonic environment, Pliocene, the China seas

CLC Number:

P744.4

YAO Bo-chu,YANG Mu-zhuang,WU Shi-guo，WANG Hong-bin. The Gas Hydrate Resources in the China Seas[J]. Geoscience, 2008, 22(3): 333-341.

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