抄録
Transformation of clay mineral facies in mudstones have been controlled mainly by overburden pressure and geothermal temperature. In primary migration of proto-petroleum from source rocks to reservoirs, expulsion of absorbed water in the swelling clay minerals by overburden pressure is considered to be very important. For the solution of these problems, study of compaction on various clays under high pressure and certain temperature is necessary.
The writers, therefore, manufactured the triaxial, hydrostatic compaction apparatus which can increase the pressure to 1500kg/cm2 and the temperature to 150°C in maximum.
Compaction on Na-montmorillontie and kaolinite clays have been conducted under the condition at 500kg/cm2 and room temperature. Water content in montmorillonite clay decreased gradually in straight, while those of kaolinite clay decreased rapidly by compaction. After 6 day's continuous experiments, there were no apprent changes in the mineralogical form of these clays.
