Abstract

Knowledge of the properties of very shallow, unconsolidated sediments is crucial to minimize drilling problems. This work was performed in ultra deep-water at the Brazilian Eastern Margin and the results address important issues including the distribution of materials and properties throughout a given field, it is necessary to 3D model both the geology and the geotechnical properties of these shallow, unconsolidated sediments. The data set used was a 3D seismic reflection in-depth domain, the results of cone penetration tests and multi-sensor core logger data to a maximum of 20 mbsf (meters below the seafloor). To construct the 3D static models, a specific protocol was followed which included the definition of grid architecture, upscaling routine, lithological and geotechnical model, and stochastic simulation through the use of sequential indicator simulation method. Therefore, for validating the models, qualitative and quantitative criteria were used. The results provide probabilistic field scenarios to compensate the lack of direct measurement from field data, such as undrained shear strength and lithological profile.

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