National Centers for Environmental Information (NCEI)

WELL LOG DATA FROM THE ATLANTIC CONTINENTAL SHELF OFF NANTUCKET ISLAND, MASSACHUSETTS

USGS DATA SETS COST G-1 AND COST G-2

Download COST G-2 Data

The U.S. Geological Survey (USGS) has recently released well logs and associated information from the deep stratigraphic test wells Cost G-1 and G-2. These data from NGDC (now NCEI).

The Cost G-1 well was drilled in 157 ft (48 m) of water to a total depth of 16,071 ft (4,989 m) from April 6 through July 16, 1976 by the semi-submersible rig SEDCO J. The Cost G-2 Well was drilled in 260 ft (79 m) of water to a total depth of 16, 071 ft (6,667 m) from January 6 through August 7, 1977 by the semi-submersible rig OCEAN VICTORY.

Results of the two stratigraphic test wells indicate a potential for oil and gas according to USGS reports. Also, according to the reports, source beds, which may have generated oil and gas, were penetrated below approximately 14,000 ft (4,267 m) in one of the wells. Rocks with good reservoir characteristics occur above 10,000 ft (3,048 m) at both well sites.

DATA AVAILABLE

COST Well G-1

ODECO Drilling Summary
Core Lab. Core Studies
Geochemical Service Report Hydrocarbon Source Facies Analysis
Seismic Reference Service Velocity Survey
Physical Formation 2" Composite (1,000-16,071')
Strip Log 2" Composite (1,000-16,071')
Borehole Compensated Sonic Log 2" Composite (4,065-16,044')
IDEL 2" Composite (1,050-16,071')
Long Spacing Sonic 2" Composite (971-16,040")
Repeat Formation Tester Composite
Compensated Neutron Formation Density 3" Composite (971-16,042")
Computed log Run #1
Temperature Log 2" Composite(971-16,070')
Dual Induction-Laterolog 2" Composite (971-16,038)
Proximity Log - Microlog Composite (971-16,043')
Continuous Dipmeter (Arrow Plot) 5" Composite (971-16,040')

COST Well G-2

ODECO Drilling Summary
Core Lab. Core Studies
IBI and Geochem. Paleo Reports and Determinations
Acoustic Velocity and Thermal Conductivity Measurements
GeoChem Service Report Hydrocarbon Source Facies Analysis
Core Lab. GeoChem. Evaluation
Additional Analysis of SWC (6,889-20,900')
Carbon Isotopic Data
Interpretive sample Log 2" Composite (1,000-21,900')
Physical Formation 2" Composite (1,100-21,870')
Compensated Neutron-Formation Density 5" Composite (1,057-21,784')
Compensated Formation Density 5" Composite (1,057-21,794')
Long Spacing Sonic 8-10' 2" Composite (1,057-21,773')
Dual Laterolog 2" Composite (12,596-21,793')
Dual Induction-Laterlog 2" Composite (1,057-21,789')
Temperature Log 2" Composite (Surface - 21,816')
Casing Collar and Perforating Record 5" Run #1
Cement bond Log 5" Run #1
Microlaterolog-Microlog 2" Run #1 (18,830-21,816')
Proximity Log-Microlog 2" Composite (4,130-18,802')
Dual Spacing Thermal Neutron Decay Time 2" Run #1 (4,000-10,000)
Computed Log Run #1
Continuous Dipmeter (Arrow Plot) 5" Composite (4,120-21,771')
Seismic Reference Service Geophysical Log (1,057-21,830')
Geophysical Interpretation and Assessment of Shallow Drilling Hazards

All data are available on two reels of 16-mm microfilm and four maps (bathymetry, sediment isopach, navigation, and shallow structure) from the area of the Cost G-2 well as full-scale sepia or blackline copies.

Sepia package (includes all logs and auxiliary information on two reels of 16-mm microfilm and four full-scale sepia maps.)
Blackline package (includes all logs and auxiliary information on two reels of 16-mm microfilm and four full-scale blackline maps.)