Inderscience Publishers

A folded wedge model for determination of true stratigraphic thickness in directional wells

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For exploration and development the geologists and engineers try to know the true stratigraphic thickness (t). The monoclinal and folded bed models are published methods for t calculation. Both models assume parallel beds which can lead to significant deviations. In order to calculate the values of t considering the effects of both folding and stratigraphic variation we propose the 'folded wedge model'. Three are considered: β1, the bed dip at the point where the well enters; β2, the bed dip at the point where the well leaves; and α, the deviated angle of borehole (angle between vertical and borehole). Three values of t can be obtained: the value measured normal to top (t6); the value measured normal to bottom (t7); the average value measured normal to bottom and top (t8). The folded wedge model is applied to the Cantarell oil field complex obtaining more reasonable values of t than using the existing methods. [Received: August 16, 2009; Accepted: February 10, 2010]

Keywords: true stratigraphic thickness, wedging bed modelling, folded wedge model, absolute deviation, directional wells, oil fields, folding variation, stratigraphic variation

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