Site CAS-05D
Proposed site:
CAS-05D
Priority:
Primary
Position:
48°47.367'N, 126°40.717'W
Water depth (m):
970
Target drilling depth (mbsf):
220
Approved maximum penetration (mbsf):
220
Survey coverage:
Regional site survey lines
• PGC9902_ODP1_MCS
• Line 89-08
• PGC0408_CAS05B_03
Figure F13
Objective:
Site CAS-05D is the shallowest water depth site on the transect. A relatively weak BSR is present at a depth of 160 ms TWT (~130 mbsf). The BSR becomes rapidly shallower in the vicinity of Site CAS-05D and represents the end-member of the gas hydrate regime on the margin.
Objectives of this site include characterization of
• pore-water chemistry and gas chemistry (headspace and voids)
• core physical properties
• gas hydrate occurrence (distribution, concentration).
An additional 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.
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