Integrated Approach to Pore Pressure and Fracture Pressure Prediction Using Well Logs: Case Study of Onshore Niger-Delta Sedimentary BasinReportar como inadecuado




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This study investigated the cause of identifiedzones of overpressure in some selected wells in a field in the Niger Deltasedimentary basin. Two models were used each for predicting pore pressure andthe corresponding fracture pressure using well log and drilling data. Shalelithology in Niger Delta is massive and characterized by high pore pressure;hence shale compaction theory is utilized in this study. The petrophysical datawere evaluated using Ikon’s Science Rokdoc software. The two major pore pressureprediction techniques employed are the Eaton’s and Bowers’ models while theEaton’s fracture pressure model and the Hubbert and Willis fracture pressureprediction models were utilized for fracture prediction. The density and soniclogs were used respectively to generate the shale trend and the shale normalcompaction trend used for the prediction. The wells studied showeddisequilibrium compaction of sediment to be the major mechanism that gave riseto overpressure in the Niger Delta. Clay diagenesis and fluid expansion werealso observed as the secondary overpressure generation mechanism in well X-1.This secondary overpressure mechanism was observed to start approximately atdepths of 10,000 ft TVD. The top of overpressure and the pressure range in thewells studied varied from 6000 to 11,017 ft TVD and 1796.70 to 5297.00 psi respectively. The Eaton’s model under-predicts pore



Autor: Cyril Ngozi Nwankwo*, Stephen Onoh Kalu

Fuente: http://www.scirp.org/



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