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doi:10.2204/iodp.sp.311.2005
Site Summaries
Site CAS-01B
Proposed site:
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CAS-01B
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Priority:
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Primary
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Position:
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48°41.884'N, 126°51.924'W
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Water depth (m):
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1325
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Target drilling depth (mbsf):
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350
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Approved maximum penetration (mbsf):
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400
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Survey coverage:
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Regional site survey lines
Line 89-08
MCS 3-D (inline 38)
MCS Line XL03
Figure F8
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Objective:
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Site CAS-01B is a revisit to Sites 889/890. A strong BSR is apparent in regional, low-frequency seismic data (Line 89-08), but higher frequency data reveal a reduction in the BSR reflection strength.
Main objectives include characterization of
pore fluid chemistry
core physical properties
gas hydrate concentration estimates
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 and by a zero-offset VSP.
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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, zero-offset VSP, 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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