抄録
Chiyoda-hamlet of Ikeda-town is situated about 20km east from Obihiro-City. In this place, 7 gas producing wells were drilled during recent two years. These wells have a depth of about 125±5m, and flow out naturally the gas with water, showing relatively high tamperature. Total daily production from these wells is nearly 155m3, and the mean value of gas water ratio is about 1:4.1. Cl- content in this under-ground water ranges from 1045 to 1720mg/L. So the writers recognized this deposits as a brackish type. And these gas producing beds probably belong to the Ikeda formation (upper-most Pliocene). Stratigraphical and areal distribution of natural gas is nearly unknown, but in this paper the writers discussed on the geochemical characters.
