抄録
Pore water moves during compaction and causes so called Compaction current and abnormal subsurface pressure in mud. Such behaviors of the pore water should be closely related to the migration of petroleum hydrocarbons. Recently, compaction equation becomes an important target among the petroleum engineers, because the equation would be very useful for numerical evaluation and simulation of these behaviors.
Compaction process has attracted more serious attention to a large number of scientists in soil mechanics for these three decades. The considerable amount of overburden pressure and strain in geologically long time are characteristic nature of the compaction in sedimentary basins. However, Terzaghi's compaction equation which has been used by many workers is not always applicable for such conditions. It may be also difficult to simulate this process by recent compaction equations based on creep mechanism, because the equations are rather complicated and because we have few useful data of these conditions.
In this paper, a case study of a sedimentary basin in the vicinity of Boso peninsula, will be reported for the first, with geological treatment in relation to some physical properties as porosity, density, and the coefficient of permeability. Secondary, an attempt to do a generalization of the compaction equation with new idea of the non-linear variation of the coefficients of compressibility and permeability is described. Then our equation is presented, which would be more suitable for analysis of petroleum migration with large-scaled numerical model.
