Geophysical logs (sonic, porosity, density, natural gamma, resistivity, and Formation MicroScanner [FMS]) will characterize the sediment. Resistivity, FMS, and sonic logs can provide in situ data on the gas hydrate present in the sediments. FMS images can provide very high resolution (2.5 mm) characterization of sedimentary structures, which are particularly difficult to obtain in XCB cores. In addition, these images show grain-size changes that aid in interpreting sedimentary processes in drift deposits, help orient XCB cores for magnetic studies, and provide a record of resistivity (although not in absolute values) for cyclicity studies. The planned dedicated logging holes are likely to provide a stable borehole and, thus, good quality logs.
To 172 Special Sampling Proceedures
172 Table of Contents