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doi:10.2204/iodp.sp.311.2005
Site Summaries (continued)
Site CAS-03B
Proposed site:
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CAS-03B
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Priority:
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Primary
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Position:
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48°37.058'N, 127°02.413'W
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Water depth (m):
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1780
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Target drilling depth (mbsf):
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300
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Approved maximum penetration (mbsf):
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300
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Survey coverage:
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Regional site survey lines
PGC9902_CAS03_SC
PGC9902_CAS03_MCS
PGC9902_ODP7_MCS
Line 89-08
Figure F10
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Objective:
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Site CAS-03B is located on the first uplifted ridge of accreted sediments. A BSR is located at 290 ms TWT (~230 mbsf).
Objectives include detailed characterization of
pore-water chemistry
core physical properties
logging (LWD and wireline)
The BSR reflection strength appears frequency dependent. The low-frequency data of Line 89-08 (~40 Hz) show a much stronger and continuous reflection than the high-frequency MCS data from 1999 (~100 Hz).
The objective is to determine the nature of the BSR reflection and the thickness of (if any) free gas zone underneath the BSR by wireline and LWD logging. If time permits, a zero-offset VSP will be performed.
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Drilling and Logging program
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APC to refusal; XCB; PCS and HYACINTH pending funding) pressure cores
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Logging program
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LWD, triple combo, FMS-sonic, multiple use of APCT, DVTPP
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Nature of rock anticipated:
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Interlayered silts and clays, some authigenic carbonates possible
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