
第27卷第6期 2013年12月
现代地质 GEOSCIENCE
青藏高原乌丽冻土区二氧化碳成因探讨
Vol. 27No. 6 Dee. 2013
杨德寿,龚建明,贺行良,王慧东,陈俊文”,杨志承,蒋玉波
(1.青海煤炭地质励查院,青海西宁810001;2.青岛海洋地质研究所,山东青岛266071;
3.长江大学地球环境与水资源学院,湖北武汉430100;4.中国海洋大学海洋地球科学学院,山东青岛266100)
摘要:为了查明青藏高原乌丽冻土区天然气的组分与成因,对采集自乌丽水合物试验孔ZK1井及其周边钻孔的岩心顶空气、岩心解析气以及湖水气进行了组分和碳同位素测试分析,同时对ZK1井及其周边钻孔岩心中的碳酸盐岩碳同位素进行了测试分析。测试结果显示:该区天然气主要成分为二氧化碳,其含量在98%以上,烃类气体(主要为甲烷)含量很少;二氧化碳碳同位素主频在-4%。--6%(VPDB)之间,少量富烃样品的甲烷碳同位素主频介于-32.38%e~-27.82%e(VPDB)之间,碳酸盐岩的碳同位素平均值为-3.87%e(VPDB)。综合分析认为,研究区二氧化碳主要为源
成因,可能与该区强烈的构造运动和岩浆活动有关。关键调:成因:二氧化碳;乌丽冻土区;青藏高原
中图分类号:TE132.2
文献标志码:A
文章编号:10008527(2013)06139207
Discussion about the CO,Origins of WuliPermafrost
ZoneinQinghai-TibetanPlateau
YANG De-shou', GONG Jian-ming, HE Xing-liang’, WANG Hui-dong',
CHEN Jun-wen', YANG Zhi-cheng', JIANG Yu-bo*
(1. Qinghai Goal Geolgical Exploration Institufe, Xining, Qinghai810001, China; 2. Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China
3. School of Earth Enuironment and Water Resources, Yangtae Uninersity, Wahan, Hubei430100, China; 4. Cllege of Marine Geosciences, Ocean Unizersity of China, Qingdao, Shandong 266100, China)
Abstract: In order to understand the component and origin of gases from gas-hydrate drillhole (ZK1) in Wuli permafrost zone, Qinghai-Tibetan Plateau, the gas components and the carbon isotopes of headspace gas samples and resolving gas samples from hole ZKl and its adjacent drillholes and gas samples from lake water are ana-lyzed. At the same time, the carbon isotopes of carbonate rocks from cores are also analyzed. The results show that more than 98% natural gas is composed of carbon dioxide with a little hydrocarbon gas( mainly methane) , the main maximum values of s" Coo, are between 4%e and 6%e ( VPDB), the main maximum values of 8l°CcH, from a few rich-methane samples are between 32. 38%e and 27. 82%e( VPDB) , while the mean val-ue of s Ccaco, is 3. 87%e( VPDB) . Integrated with regional geology, it could be drawn a conclusion that the CO, of Wuli permafrost zone is mainly of volcanic mantle type, which is related with strong tectonic movement and magma activities.
Key words: origin; carbon dioxide; Wuli permafrost zone ; Qinghai-Tibetan Plateau
收稿日期:2013-04-10;改回日期:2013-10-10;责任编辑:潘令枝
目1(990%)国自
作者简介:杨德寿,男,高级工程师,1963年出生,地质调查勘探专业,主要从事煤田地质勘查研究。
Email: mkyds@ 163. com
通信作者:冀建明,男,研究员,1964年出生,石油地质专业,主要从事油气地质与天然气本合物研究。
Email: gongjianm@ aliyun com,