Geochemical Characteristics of Hydrocarbon Gases and Their Origin from the Sediments of the South China Sea

Abstract

Abstract:

Hydrocarbon gases from sediments are the resources to form natural gas and gas hydrate, which could be measured by headspace gas, absorbed gas, and “extraction” gas(which released by acid treatment of the sediments). Total 767 samples of sediments from 473 stations were collected from the South China Sea, and were treated with acid to determine the concentrations of hydrocarbon gases. The methane concentrations range from 0.8 to 22,153.6 μl/kg with averagely 335.8 μl/kg, and six anomalous areas of higher methane concentrations are subdivided in the South China Sea, including the Taixinan Basin and the Dongsha Islands, the Bijianan Basin, the Qiongdongnan Basin and the Xisha Trough, the Zhongjiannan Basin and Zhongyebei Basin, the Wan'an Basin and Nanweixi Basin, and the Nansha Trough. However, the Nansha Trough is of the highest methane concentrations, and the Taixinan Basin is the secondly, respectively. Total 154 samples were been determined for carbon isotopic composition, whose δ¹³Cvalues of methane range from-101.7‰ to -24.4‰ with averagely -44.5‰(PDB).Furthermore, lower δ¹³Cvalues of methane(from -101.7‰ to -71.4‰)are observed in the Nansha Trough, which seem to be mainly microbial gas or mixed gas, whereas there are much 〖JP4〗more thermogenic gas in the other areas of the South China Sea, whose higher δ¹³C values(from -51.0‰ to -24.4‰)are discovered, respectively.

Key words: hydrocarbon gases, methane, stable isotope, gas origin, the South China Sea

CLC Number:

P59
P744.4

ZHU You-hai, WU Bi-hao, LUO Xu-rong, ZHANG Guang-xue. Geochemical Characteristics of Hydrocarbon Gases and Their Origin from the Sediments of the South China Sea[J]. Geoscience, 2008, 22(3): 407-414.

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