抄録
No significant oil or gas fields were found in the Ishikari-Hidaka Area despite the exploration activities carried out for a long period. Since 1970, several deep wells have been drilled in the area and subsurface geological data were derived for regional control. Hydrocarbon exploration to date has discovered sandstones of the Ishikari Group with potential reservoir characteristics. No other important sandstone nor any carbonate reservoir targets were revealed in the area. Volcanic reservoirs are expected to be one of the important targets in future exploration here as has been found in the Northeast Inner Japan Area where approximately fifty percent of oil and gas production has derived from volcanic or pyroclastic reservoirs.
The western half of the Ishikari-Hidaka Area is adjacent to the "Green Tuff" Area of Southwestern Hokkaido. Therefore, it is thought that the area has been considerably affected by volcanic activity. In this paper, the area is subdivided into four tectonic provinces and the stages and rock facies of the volcanic and pyroclastic rocks of these provinces are reviewed.
