Gas Composition of Hydrate-bearing Cores in Juhugeng Drilling Area in Qinghai and Its Indicative Significance

Geoscience ›› 2015, Vol. 29 ›› Issue (5): 1194-1200.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Gas Composition of Hydrate-bearing Cores in Juhugeng Drilling Area in Qinghai and Its Indicative Significance

HE Xing-liang1,2，LIU Chang-ling2，MENG Qing-guo2，LU Zhen-quan3，WEN Huai-jun4，LI Yong-hong4，ZHANG Shao-lin4，WANG Jiang-tao1

(1.Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao, Shandong266100, China；2.Key Laboratory of Gas Hydrate of Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, Shandong266071, China; 3.Oil & Gas Survey, China Geological Survey, Beijing100029, China; 4.Qinghai No.105 Coal Geological Exploration Team, Xining, Qinghai810007, China)

Online:2015-10-29 Published:2015-12-24

Abstract

Abstract:

Studying the composition characteristics of gases dissociated from hydrate-bearing cores in Juhugeng drilling area in Qinghai can be helpful for finding out the gases genesis and origin of natural gas hydrates, and can provide scientific guidance for gas hydrates exploration and exploitation. The gas molecular and stable isotopic compositions are analyzed for the totally 18 hydrate-bearing cores from 5 drilling holes (DK8-19, DK10-17, DK11-14, DK12-13 and DK13-11). The relevant diagrams of C_l/ (C₂+C₃)-δ¹³C_C1, δD_C1-δ¹³C_C1 and δ¹³C_C2-δ¹³C_C1are investigated in this paper. The results show that gases dissociated from hydrate-bearing cores mainly composed of light hydrocarbons with features of wet gas in Juhugeng drilling area in Qinghai and the isotopes are characterized as normal carbon isotopic series. In the drilling area, gases from most hydrate-bearing cores are mainly thermogenetic gas origin, and typical organic genetic gases formed in freshwater environment. However, it contains probably a small amount of biogenic gases in the shallow cores of DK8-19 hole.

Key words: gas hydrate, Juhugeng drilling area, gas composition, isotope, gas origin

CLC Number:

P618.1
P632

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Gas Composition of Hydrate-bearing Cores in Juhugeng Drilling Area in Qinghai and Its Indicative Significance

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