The Use of Seismic Attributes and Well Logs in Delineating Kick Horizon; A Case Study of Nova Well, Niger Delta Basin, Nigeria

Abstract

Predrill pore pressure prediction of the NOVA well suggested that the drilling program was in agreement with available seismic surveys. However, a kick was encountered while during the well. The study was carried out to ascertain the cause of the kick horizon in the NOVA Well, using seismic attributes and well log. Eight stratigraphic horizons were characterized to describe the amplitude variations. The top and base of the kick horizon were picked and sculptured to create sub-volume maps.The results revealed that the kick horizon was a shaly unit. The kick horizon was far off bright amplitudes that could have delivered high pressure which could trigger a kick. Faulting, shallow water and gas flows have been suggested as possible causes of the kick. A kill weight mud should be factored into the drilling operations to produce hydrostatic pressure where the kick is entering the NOVA well in order to prevent a blow out.