Next Section |
Table of Contents
doi:10.2204/iodp.sp.311.2005
Site Summaries (continued)
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
|
Next Section |
Table of Contents
|