| 講演要旨(和文) | | 筆者達は,地盤工学分野を対象としたロックフィジックスをベースにした物理探査データの解釈技術の研究を開始した.研究では,先ず室内岩石試験や検層で得られた岩石物性データを収集するとともに,それらのデータを用いて既存の岩石モデルの適用性に関する予備的な検討を始めた.本稿では,収集した岩石物性データの内容と実例を紹介するとともに,収集したデータのうち,国内の代表的な岩種である堆積年代の若い堆積軟岩の例として泥岩ならびに亀裂の多い結晶質岩の例として花崗岩の物性データについて既存の岩石モデルの適用を試み,その適用性を評価した.その結果,適切なモデルを選択すれば既存の岩石モデルの適用が可能なこと,またP波に加えてS波特性を利用することにより精度の高いモデル化が可能なことが確認された. |
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| | 講演要旨(英文) | | In recent years, rock physical interpretation of seismic data has been aggressively used in oil and gas industry for characterizing and monitoring oil and gas reservoirs. In this field, only sedimentary rocks such as sandstone have been modeled using mainly seismic data. In civil engineering and environmental applications, rock physical interpretation of geophysical data has become more important to obtain mechanical and hydrogeological subsurface models. In geotechnical applications, not only sedimentary rocks but also crystalline rocks such as granite must be characterized and modeled for further analysis. We have therefore started studying rock physics models of wide variety of rocks using many geophysical data for geotechnical applications. We firstly collected the data of physical properties of rocks obtained in laboratory tests and well loggings and then used these data for preliminary study of applicability of the existing rock physics models. In this paper, the physical properties of rocks collected so far are presented with some examples of their cross-plots. Existing rock physics models are applied to young soft mudstones and crystalline granite which are very common rocks in geotechnical applications in Japan to evaluate their applicability. These preliminary applications reveal that the specific rocks presented here can be modeled by the existing models appropriately selected and S-wave characteristics in addition to P-wave ones can be effectively used to model rocks more accurately. |
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