Figure 5
The behaviors of natural gases and gas production in a commercial well in the Minami-Kanto gas field. (a) The relationship between natural gas production and the level of fluid pressure difference between the sand and mud layers over time (adapted from Kimura et al. (1993)). (b) A schematic illustration showing the migration of the gases within the mud to sand layers along with the production of gas-associated formation waters. The bar below the time axes in a represents the period when the migration of the gases shown in b occurs.
