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doi:10.2204/iodp.sp.311.2005

Site Summaries (continued)

Site CAS-06A
Proposed site:
 		CAS-06A
Priority:
 		Primary
Position:
 		48°40.050'N, 126°51.053'W
Water depth (m):
 		1280
Target drilling depth (mbsf):
 		300
Approved maximum penetration (mbsf):
 		300
Survey coverage:
  • SCS 3-D data 2000 (inline 16)
  • MCS 3-D data 1999 (inline 27)
  • Regional MCS Line PGC9902_XL07
     Figures F14, F15, F16, F17, F18
    • Objective:
         		Site CAS-06A is located in an active cold vent area. There are shallow massive gas hydrate occurrences, carbonate outcrops, and chemosynthetic communities.
    The primary objectives are to characterize
  • gas hydrate and free gas occurrence throughout the cold vent
  • nature of the fluid flow regime
  • pore-water chemistry
  • core physical properties
    A further objective is to determine the nature of the BSR reflection and the thickness of the free gas zone (if any) underneath the BSR by wireline and LWD logging.
    A main open question from previous analyses is if a BSR is present underneath the vents (model by Riedel et al., 2002) or if the BSR is elevated (model by Wood et al., 2002).
    • Drilling and Logging program
         		APC to refusal; XCB; PCS and HYACINTH (pending funding) pressure cores
    Logging program
         		LWD, triple combo, FMS-sonic, multiple use of APCT, DVTPP
    Nature of rock anticipated:
         		Interlayered silts and clays, some authigenic carbonates possible

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