抄録
The Tsuchizaki-oki Oil Field is located in the Japan Sea, approximately two kilomters west of the town of Akita-shi. The discovery well was completed at II zone, 550 meters depth, in 1959. The purpose of this study was to determine the production history of the Tsuchizaki-oki Oil Field. In order to resolve this problem, it was necessary to assume the reservoir pressure decline curves. Although early in the development period of the field bottom hole pressure serveys were made, the measurement of bottom hole pressure did not carry out since the reservoir pressure was depleted. kg/k0 curves were calculated from the field data. The results obtained from this study are as follows:
(1) The drainage mechanism of II zone might be a solution gas drive.
(2) The oil in place in the central area of II zone might be about 250, 000kl.
(3) The relationship between the reservoir pressure and the recovery is shown in Fig. 8. Curve J in Fig. 6 was used in this calculation. The pressure history was considered to be represented by curve J.
