火山岩ガス層に関する2,3の地質学的考察藤川ガス田を主として
1969 年 34 巻 6 号 p. 297-304
詳細
1969 年 34 巻 6 号 p. 297-304
In Niigata Prefecture, so-called volcanic rock resrvoirs-lava flows, agglomerates and tuff breccias-are very imporotant for the production of oil and gas.
Some geologic considerations are attempted on Fujikawa Gas Field as a typical example of volcanic rock reservoirs.
1. Open flow capacity (O.F.C.) of each well has relation to strctural position and not to the length of completion interval. Wells along the anticlinal axis have larger O.F.C. than those on the wing.
The writer presumes this fact may depend on the distribution of fractures.
2. Drilling mud losses are observed only at the wells with over 300, 000 M3/D O.F.C.
3. Pelations between gas and Δt sh of mudstones on the reservoir are considered.
4. At Fujikawa, bottom hole temperatures have a tendency of rising with time.
