西沙海槽研究区天然气水合物地球化学勘探

孙春岩; 王宏语; 牛滨华; 黄新武

西沙海槽研究区天然气水合物地球化学勘探

中国地质大学工程技术学院, 北京 100083

基金项目:

国家“863”计划项目 2001AA611020

“973”计划 G2000046705

详细信息

作者简介:
孙春岩(1954-), 女, 教授, 从事以化探和地震为主的综合勘查技术方法和解释研究工作.E-mail: suncy@cugb.edu.cn

中图分类号: P618
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出版历程
- 收稿日期: 2003-10-20
- 刊出日期: 2004-03-25

Geochemical Prospecting of Gas Hydrate at Xisha Ocean Trough

School ofEngineering and Technology, China University ofGeosciences, Beijing 100083, China

摘要

摘要: 天然气水合物研究涵盖了地球物理、地球化学和地质等多门学科, 其中勘查地球化学方法技术可以从海底介质中获得与天然气水合物有关的痕量地球化学信息, 圈定水合物异常区域.依据2000年和2001年在中国南海西沙海槽工作区天然气水合物地球化学现场快速勘查实测和室内分析测试的多种烃类结果, 获得了海上工作区气态烃地球化学异常分布, 以及与该区水合物地震BSR和BZ的对比分析评价结果.同时根据现场实测同位素数据, 探讨了工作区形成水合物气态烃甲烷的成因.研究成果为工作区天然气水合物勘探提供了地球化学方面的直接证据.
- 天然气水合物 /
- 似海底反射 /
- 地球化学勘探 /
- 西沙海槽 /
- 有利远景区
Abstract: Researches of gas hydrate involve cross-disciplinary data from geophysics, geochemistry and geology. Geochemical technologies can be used to collect the trace amount geochemical data about gas hydrate from seafloor media which will indicate the abnormal region. The original data was collected in the marine science investigation about gas hydrate in 2000 and 2001. After further indoor analysis and testing of multiple hydrocarbons, the abnormal region of marine gas hydrate was indicated, and the evaluation results were also derived from comparative analysis of seismic BSR and BZ about gas hydrate. With the on-site isotope data, the resulting cause about gas hydrate methane was discussed. These achievements will provide direct geochemical evidences for the exploration of gas hydrate at Xisha ocean trough.
- gas hydrate /
- BSR (bottom simulated reflector) /
- geochemical prospecting /
- Xisha ocean trough /
- favorable prospecting area

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图 1 研究工作区位置

Fig. 1. Location of working area

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图 2 西沙海槽(距海底1.3~1.5 m) 沉积物甲烷含量等值线

Fig. 2. Concentration contour of methane for sediments at Xisha ocean trough

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图 3 西沙海槽(距海底1.3~1.5 m) 沉积物乙烷含量等值线

Fig. 3. Concentration contour of ethane for sediments at Xisha ocean trough

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图 4 水合物重点勘探远景区预测

Fig. 4. Favorable prospecting area of marine gas hydrate

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图 5 西沙海槽甲烷碳同位素和烃类气体组成判别气体成因

1.布莱克海台; 2.黑海; 3.鄂霍茨克海; 4.ODP; 5.加利福尼亚; 6.里海; 7.墨西哥湾; 8.Prudhoe海湾; 9.南沙海槽; 10.西沙海槽; 11.西沙海槽(虚线小方框为本次研究的值区域); 其中部分数据来自于Bernard, 1976;Matsumotod等, 2000; Berner, 1992

Fig. 5. Discriminating cause of gas hydrate with methane carbon isotope and hydrocarbon component

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表 1 海上沉积物气态烃指标参数

Table 1. Indicatrix of marine gas hydrate

参考文献(16)

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