| 講演要旨(和文) | | 多点法地球統計学は,地質体の空間的なパターンの再現に優れた岩相モデリング手法を提供する.これを用いてアルバータ州ハンギングストン地域マクマレー層を対象とした岩相モデリングを実施した.潮汐性蛇行河川システムで堆積したポイントバー堆積物と解釈される対象層を特徴付ける岩相分布の方向性や局所性,さらにビチューメン生産の障害となる泥岩相薄層の分布を再現する岩相モデリングに成功した.訓練像の作成には試行錯誤を伴うが、それは多点法の実用に関する知見の蓄積となった.また,地震探査データから抽出した岩相出現確率の情報を統合することで,ポイントバーのイメージを損なうことなく岩相分布に拘束を加えられることを確認した.さらに,多点法を応用した岩相逆解析法,すなわち合成地震記録と地震探査記録の波形類似性の視点から岩相分布を拘束するモデリング手法の実データへの適用性についても検討した. |
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| | 講演要旨(英文) | | Multipoint-geostatistics, providing a powerful function of the facies modeling to reconstruct spacial patterns of geological objects, was employed in reservoir modeling work of the McMurray Formation in Hangingstone field, Alberta, Canada. A sedimentary environment of the target formation considered to be tidally-influenced meandering fluvial system requested the facies models to reflect an image of the point-bar deposits, including a locally-varying feature of the facies distribution with some directional trends as well as a feature of the thin mudstone layers that can adversely impact to SAGD production performance. The multipoint-geostatistical technique succeeded in constructing facies models capturing the features of the point-bar deposits. Trials and errors in generating training images extended knowledge of the multipoint-geostatistics in terms of its practical usage. Integration of the soft probabilities associated with facies proportion derived from seismic data gives constraints to the models to control facies distribution without collapsing the image of the point-bar deposits. Multipoint seismic inversion, a newly-proposed application of the multipoint-geostatistics giving a constraint to the facies distribution from the view point of similarity between synthetic and field seismograms, was also tested in regard to applicability to the real data obtained from the target area. |
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