Warmest congratulations on the 30th anniversary of the UNUGTP!

Transcription

1 Warmest congratulations on the 30th anniversary of the UNUGTP! Warmest congratulations on the achievements of the Icelandic handball team in Beijing Olympic Games!

2 A brief review of geological studies of geothermal systems in China PANG Zhonghe Institute of Geology and Geophysics,Chinese Academy of Sciences UNUGTP fellow 1988 Presented at the 30th Anniversary Workshop of the United Nations University Geothermal Training Programme, Reykjavik, Iceland, August 2008

3 Contents Geothermal background of the country Hydrothermal systems in China with four case studies Use of heat while reducing thermal hazards in deep coal mines Sequestration of CO2 in saline aquifers with benefits of enhanced geothermal reservoir injection

4 Geothermal background is significantly different in northern and southern China Based on measurements in around 1500 wells in China, this map was produced in the 1990s and has been updated eversince. It gives the general geothermal background of the country. Hu Shengbiao et al., 2000, EPSL

5 Hot springs are found in every region but more in the south Around 3200 sites are included in this map of geothermal systems. It shows the major geothermal resources in the country. According their formation mechanism, these systems are grouped into three types and four zones.

6 High temperature hydrothermal systems in Tibetan plateau High temperature systems are located in Tibet, Yunnan and Taiwan, The highest temperature measured is 260 C at 2000 depth in Yangbajain, Tibet. Well ZK4001 in vertical discharge in Yangbajain of Tibet, 2002 Yangbajain geothermal power plant in Tibet, 26MW, since 1970s

7 Low temperature convective systems in small fault basins Low temperature systems of convective type are located mainly found in small fault basins, with the highest temperature measured of C at wellhead in downtown Zhangzhou city, SE China. Temperature is dependent on the age and size of the basin. Pang Zhonghe, 1987, (Ph.D. thesis), Wang et al., 1993

8 Chemical geothermometry The FixAl method applied to Zhangzhou geothermal field gives reservoir temperature of 150. FixAl is suitable also for low temperature systems. (Pang & Reed, 1998, GCA):

9 SO 4 -H 2 O Oxygen isotope geothermometry The isotopic geothermometer used to evaluate the reservori temperature of Zhangzhou geothermal field, giving Pang Zhonghe, 2005,IAEA

10 Low temperature conductive systems in large sedimentary basins Low temperature systems of conductive type are located mainly in sedimentary basins the temperature of 90 C measured at wellhead in downtown Xi an.

11 Genesis model of Xiongxian geothermal system, North China Basin Low temperature systems of conductive type in North China Basin is formed by redistribution of heat flow as a result of tectonic variations. Modified from Chen et al., 1988

12 Radioactive tracer tests for reservoir management in Tinjian Activity (Bq/L) Time After Tracer Injection (Day) Zhao et al, 2002, IAEA workshop

13 Geothermal systems in Guanzhong Basin: a new type? Qin, Turner and Pang, 2005, Geothermics

14 Unique oxygen-18 isotope shift in Xi an geothermal field, Guangzhong Basin 深层地热水 浅层冷水 GMWL -30 当地大气降水 浅层地热水 LMWL -40 北山岩溶水 δd ( ) δ 18 O ( ) Qin, Turner and Pang, 2005, Geothermics

15 Guangzhong Basin δd δ 18 O T( ) Depth (m) 3500 Depth (m) 3500 Depth (m)

16 Use of heat and reduce thermal hazards in deep coal mines Kailuan Southwest Shandong Eastern part of North China Craton Xinshui Basin Huainan and Huaibei

17 Geothermal hazards in deep coal mines Shallow coal beds Coal mines at 800~1500 m Deep coal beds Shallow coal beds Deep coal beds

18 Geological sequestration of CO2 in deep saline aquifers while enhancing geothermal injectivity

19 Low rejection rate in Tianjin geothermal field Volume of Water( 10 4 m 3 ) Year Reinjection Production

20 Greetings to UNUGTP Beijing, 2007

21 Greetings to UNUGTP Tianjin, 2008

22 Wishing the UNUGTP a pleasant journey!

23 Wishing our geothermal torch an everlasting flame for mankind!

24 谢谢您的关注! 欢迎批评指正! Thanks for your attention!