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The information on net reservoir and shale interval thicknesses collected from wells, along with a vertical indicator variogram, provide limited information about the horizontal extent and connectivity of these intervals. In this paper, a novel quantitative approach for predicting the lateral extents of the barriers, using thickness information provided by well log data, is proposed. The proposed approach is based on moments of inertia (MOI) applied to the shale objects to determine their effective size. The MOI calculation is aimed to simplify the almost infinite complexity of shale bodies into summary size parameters that can be readily understood and calibrated to production parameters. A case study is presented for optimal well placement accounting for uncertainty in the shale barrier sizes.<\/jats:p>","DOI":"10.1144\/petgeo2013-039","type":"journal-article","created":{"date-parts":[[2015,5,30]],"date-time":"2015-05-30T00:50:20Z","timestamp":1432947020000},"page":"322-332","source":"Crossref","is-referenced-by-count":5,"title":["Estimating barrier shale extent and optimizing well placement in heavy oil reservoirs"],"prefix":"10.1144","volume":"21","author":[{"given":"Saina","family":"Lajevardi","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering, 3-133 Markin\/CNRL Natural Resources Facility, Centre for Computational Geostatistics, University of Alberta, Edmonton, AB T6G 2W2, Canada"}]},{"given":"Olena","family":"Babak","sequence":"additional","affiliation":[{"name":"Cenovus Energy Inc., 500 Centre Street SE, Calgary, AB T2P 0M5, Canada"}]},{"given":"Clayton V.","family":"Deutsch","sequence":"additional","affiliation":[{"name":"School of Mining and Petroleum Engineering, Department of Civil &amp; Environmental Engineering, 3-133 Markin\/CNRL NREF Building, University of Alberta, Edmonton, AB T6G 2W2 Canada"}]}],"member":"1881","published-online":{"date-parts":[[2015,5,29]]},"reference":[{"key":"e_1_3_3_2_1","first-page":"96","article-title":"Metropolis, Monte Carlo and the maniac","volume":"14","author":"Anderson H.L.","year":"1986","unstructured":"Anderson H.L. 1986. 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