Study on Evaluation Method for Heterogeneous Sedimentary Rocks Based on Forward Model

Kato, Arata*; Kawada, Koji*; Masui, Yasuhiro*; Tsuji, Takashi*; Suwabe, Mizue*

It is very important to estimate the facies distribution of heterogeneous sedimentary rocks for geological disposal of high level radioactive waste. The heterogeneousness of sedimentary rocks is due to variable distribution of grain size and mineral composition. The objective of this study is to establish the evaluation method for heterogeneous sedimentary rocks based on forward model. In this study, the following items were studied. 1..The sedimentary system for Koetoi and Wakkanai formations in Horonobe area was compiled based on published papers. 2..The cores of HDB-1 were observed mainly from sedimentological view. 3..The facies and compaction property of argillaceous rocks were studied based on physical logs and core analysis data of wells. 4..The structure maps, isochrone maps, isopach maps and restored geological sections were made. 5..The soft wear for sedimentary model to show sedimentary system on a basin scale was developed.