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doi:10.2204/iodp.sp.311.2005

Site Summaries (continued)

Site CAS-06B
Proposed site:
 		CAS-06B
Priority:
 		Alternate
Position:
 		48°41.178'N, 126°52.363'W
Water depth (m):
 		1280
Target drilling depth (mbsf):
 		300
Approved maximum penetration (mbsf):
 		300
Survey coverage:
  • SCS 3-D data 2004 (line 22, line X05b)
  • MCS 3-D data 1999 (inline 27)
     Figures F19, F20
    • Objective:
         		Site CAS-06B is the inactive vent site, which shows widespread seismic blanking, with blanking increasing with seismic frequency. No chemosynthetic communities nor massive gas hydrate near seafloor have been observed.
    Objectives include characterization of
  • focused fluid-flow regime,
  • pore water chemistry,
  • core physical properties
  • nature of the BSR reflection and the thickness of the free gas zone (if any) underneath the BSR by wireline and LWD logging
    • 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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