Abstract
Permeability of sediments is the most effective factor to estimate methane gas from methane hydrate-bearing layers. Although, it is very difficult to sample, because methane hydrate which is contained in un-/semi- consolidated sediments is not stable at atmospheric conditions, moreover, to measure their permeability need techniques. We had developed the pressure temperature core sampler (PTCS) and it brought up sediment samples from methane hydrate-bearing zone of the eastern Nankai Trough, successfully. Thus, several core tests for measuring permeability were carried out.From the results of permeability measurements, we could grasp the relationships between permeability of sand/mud strata and pore space volume in samples. It was considered that these relationships were able to estimate in-situ permeability of sand/mud strata by calculation using the wire-line logging data. Applying the relationships on cored well for calculation were very suitable not only for the values of laboratory measurements but also very close to the relative permeability curves calculated by CMR analysis, especially Timur-Cotes method for permeability calculation. Finally, we could calibrate relative permeability by the measurement relationships.
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