To 186 Site JT-2G Track Line
To 186 KH96-3 Line 2
Position: 38°47.75ŽN, 143°21.9ŽE
Water Depth: 2245 m
Sediment Thickness: ~1300 m
Target Drilling Depth: 1000-1600 mbsf
Approved Maximum Penetration: 1600 mbsf
Seismic Coverage: North of intersection of KH96-3 Line 2 and KH90-1 Line JT90; at CDP 1430 on Line 2
Objectives: The objectives of Site JT-2G are:
Drilling Program: APC to 250 mbsf, XCB to 450 mbsf, and RCB to 1000 mbsf and up to 600 m deeper, if time permits. Drill the instrumented borehole to ~1000 mbsf, install reentry cone, and case through unstable section.
Logging and Downhole Operations: Triple combo, FMS/sonic/temperature, BHTV; install long-term sensor package and cement at the bottom.
Nature of Rock Anticipated: Sandy, silty, pebbly clay with ash layers (50 m); clayey diatom ooze, diatomaceous clay, ash layers (~350 m); diatomaceous claystone, clayey diatomite (~250 m); claystone, diatomaceous claystone, calcareous claystone (~200 m); sandy claystone, diatomaceous claystone (~200 m); turbidites and silty claystone (~100 m), sandstone and siltstone (~100 m), boulder to pebble conglomerate and breccia, dacite and mudstone clasts (~50 m); and silicified claystone (~100 m).
To 186 Site JT-3
To 186 Table of Contents