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JAEA Reports

Study on a method to evaluate heterogeneity of sedimentary rocks using a forward model, 3 (Contract research)

Hara, Akio*; Hoshi, Kazuyoshi*; Kato, Arata*; Maekawa, Keisuke

JAEA-Research 2007-015, 104 Pages, 2007/03

JAEA-Research-2007-015.pdf:25.1MB

It is very important for performance assessment of high-level radioactive waste disposal to develop a method to estimate heterogeneity of sedimentary rocks. We studied siliceous shale from boreholes in the Horonobe area, and developed a sedimentary process modeling software in order to establish a method to estimate heterogeneity of sedimentary rocks. In this study, we aimed for addition of functions in sedimentary process modeling software and improvement of operability. For the former aim, we added functions which were enable to consider the second sedimentation style and influences by subsidence and upheaval of basement of sedimentary basin at the time of a shoreline movement calculation. And, on the occasion of the output of calculation results, we changed the file format in order to enable to adapt to the current visualization software. For the latter aim, we developed the Graphic User Interface (GUI) to support a work for data input. Using this sedimentary process modeling software with the above-mentioned improvement, we carried out simulations for Horonobe area. For making of input data, we utilized the existing data from geological surveys which were carried out by not only Japan Atomic Energy Agency but the others. Therefore we showed two realizations of geological model of Horonobe area. Moreover, we suggested a possibility of sand deposition in a remote area from accutual boreholes. From these results, we showed an applicability of this modeling methodology.

JAEA Reports

Existing reflection seismic data re-preocessing

Higashinaka, Motonori*; Sano, Yukiko*; Kozawa, Takeshi*

JNC TJ5410 2005-009, 96 Pages, 2005/08

JNC-TJ5410-2005-009.pdf:36.66MB

This document is to report the result of existing seismic data reprocessing around Horonobe town, Hokkaido, Japan, which is a part of the Horonbe Undergounrd Research Project. The main purpose of the re-processing is to recognize the subsurface structure of Omagari Fault and fold sysytem around Omagari Fault. The seismic lines fore re-processing are TYHR-A3 and SHRB-2line, which is surceyed in 1975. Applying weathering static correction using refraction analysis and noise suprression procedure, we have much enhanced sesmic prifile.

JAEA Reports

Study on a Method to Evaluate Heterogeneity of Sedimentary Rocks Using a Forward Model, II (Summary)

Hoshi, Kazuyoshi*; Hou, J.-Y.*; Kawada, Koji*; Tsuji, Takashi*; Suwabe, Mizue*

JNC TJ8400 2005-009, 67 Pages, 2005/01

JNC-TJ8400-2005-009.pdf:13.82MB

Developing a method to evaluate heterogeneity of sedimentary rocks is very important for a site survey and a property test of the site. We studied siliceous shale from wells in the Horonobe area, and developed a sedimentary process modeling software in order to establish a method to evaluate heterogeneity of sedimentary rocks. Well log analysis of Koetoi and Wakkanai Formations revealed variations of porosity, shale content, and amount of erosion. We correlate marker beds, and establish a compaction curve for siliceous shale in the Horonobe area. EMI analysis revealed alternation of thin beds which can not been recognized by naked eyes. Chemical analysis shows that this heterogeneity originates from a variation in diatom and clastic material contents in the rock. We also examined seismic data using GDI method. For sedimentary modeling software, we expanded the sedimentary simulation module, and attached another module to compare the calculated results with actual data. We also attached the module to find the best input parameters. We performed a test run using the geology model we made for Horonobe area.

JAEA Reports

Study on a Method to Evaluate Heterogeneity of Sedimentary Rocks Using a Forward Model, II

Hoshi, Kazuyoshi*; Hou, J.-Y.*; Kawada, Koji*; Tsuji, Takashi*; Suwabe, Mizue*

JNC TJ8400 2005-008, 138 Pages, 2005/01

JNC-TJ8400-2005-008.pdf:25.65MB

Developing a method to evaluate heterogeneity of sedimentary rocks is very important for a site survey and a property test of the site. We studied siliceous shale from wells in the Horonobe area, and developed a sedimentary process modeling software in order to establish a method to evaluate heterogeneity of sedimentary rocks. Well log analysis of Koetoi and Wakkanai Formations revealed variations of porosity, shale content, and amount of erosion. We correlate marker beds, and establish a compaction curve for siliceous shale in the Horonobe area. EMI analysis revealed alternation of thin beds which can not been recognized by naked eyes. Chemical analysis shows that this heterogeneity originates from a variation in diatom and clastic material contents in the rock. We also examined seismic data using GDI method. For sedimentary modeling software, we expanded the sedimentary simulation module, and attached another module to compare the calculated results with actual data. We also attached the module to find the best input parameters. We performed a test run using the geology model we made for Horonobe area.

JAEA Reports

Seismic Reflection Image Enhancement Using VSP Data for Geological Structure Analysis in Tono Area

Ino, Shigeru*; Narahara, Shogo*; Kawanaka, Taku*

JNC TJ7440 2005-078, 99 Pages, 2004/03

JNC-TJ7440-2005-078.PDF:17.74MB

no abstracts in English

JAEA Reports

Gravity data reprocessing

Higashinaka, Motonori*

JNC TJ5410 2004-003, 15 Pages, 2004/03

JNC-TJ5410-2004-003.pdf:19.7MB

This document is to report the results of Gravity data reprocessing around Horonobe town, Hokkaido, Japan, which is a part of the Horonobe underground research program. The main purpose of this reprocessing is to recognize the effect of Omagari Fault in gravity anomaly. Following information was obtained from Gravity anomaly maps and gravity forward modeling results. (1) There is NWN-SWS Low gravity anomaly belt in west side of predicted Omagari Fault position. (2) Gravity forward modeling shows that low gravity anomaly was explained by assuming low density to Koetoi Formation, especially lower density near anticline axis. (3) Using simple fault model, gravity forward modeling shows that the high-resolution gravity survey will provide more detailed information about the position of fault. The desirable gravity data sampling interval are denser than 100m. This gravity re-processing provides some useful information to know the geological structure and its characters around Omagari Fault.

JAEA Reports

Study on Evaluation Method for Heterogeneous Sedimentary Rocks Based on Foward Model -Outline-

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

JNC TJ8400 2003-094, 71 Pages, 2004/02

JNC-TJ8400-2003-094.pdf:2.03MB

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.

JAEA Reports

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

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

JNC TJ8400 2003-093, 178 Pages, 2004/02

JNC-TJ8400-2003-093.pdf:5.72MB

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.

JAEA Reports