HR: 0800h
AN: T51A-1315    [Abstracts]
TI: Compositions of On-Site Monitoring on Dissolved Gas of Drilling Mud Flow and Pore-Gases of Drilled Cores of TCDP
AU: * Yang, T F
EM: tyyang@ntu.edu.tw
AF: Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei, 106 Taiwan
AU: Walia, V
EM: walia@ncree.org.tw
AF: National Center for Research on Earthquake Engineering, 200, Sec.3, Xinhai Road, Taipei, 106 Taiwan
AU: Lee, H
EM: r90224106@ntu.edu.tw
AF: Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei, 106 Taiwan
AU: Song, S
EM: srsong@ntu.edu.tw
AF: Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei, 106 Taiwan
AU: Wang, C
EM: wangcy@earth.ncu.edu.tw
AF: Institute of Geophysics, National Central University, No.300, Jhongda Rd., Jhongli, 320 Taiwan
AB: Using a degasser device, we continuously pump the dissolved gas from drilling mud water to monitor the dissolved gas composition of drilling mud flow at TCDP drilling site through an automatic monitoring station equipped with quadrupole mass spectrometer (QMS) and radon detector. Besides the gas monitoring, we also extract gas samples in situ from the drilled cores to further check their gas composition and sources at different depths. The results show that the dissolved gases of drilling mud and pore gases of drilled samples are mainly composed of N2, O2, Ar, which are atmospheric air composition. However, some distinct CO2, CH4 and radon enriched zones can be recognized at various depths. It implies that CO2 and CH4 are main gas sources underneath the region and can be detected at high porosity zone, where are usually fractural and/or fault zones. From the variations of gas composition along the drilling depth, we are able to detect some possible fracture and fault zones in different depth which can correlate well with the logging data and drilling cores.
DE: 1094 Instruments and techniques
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1217 Time variable gravity (7223, 7230)
SC: Tectonophysics [T]
MN: Fall Meeting 2005