| Popis: |
The JAPEX/JNOC/GSC et al. Mallik 5L-38 production research well is drilled to a depth of 1166 m in the Mackenzie Delta of the northwestern Canadian Arctic. Gas-hydrate dominant layers occur within the methane hydrate stability zone at depths from 890 to 1108 m, where pore-space hydrates are very small in size and typically fill intergranular porosity of sands. In general, gas hydrate-bearing sandy strata are 10 cm to a few meters thick with an estimated porosity of 36 to 42 per cent. Gas hydrate saturations in most gas hydrate layers reach 80 per cent pore saturation or more. The core samples containing gas hydrates were subjected to X-ray diffraction and Raman spectroscopy measurements to observe the sedimentary textures and gas-hydrate occurrences inside the cores. Several diagnostic techniques were used to determine their petrophysical properties, biostratigraphy, geochemistry, microbiology, and gas hydrate characteristics. It was determined that pore-space hydrates contained in sands are composed mostly of structure I hydrates. The influence of temperature on P and S wave velocities of the sands was also evaluated and mechanical strength, thermal conductivity and electrical resistivity was measured. |
