Full text loading...
-
Novel While-drilling Workflow for Reservoir Structural Prediction ahead of the Bit
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Deep directional resistivity measurements while drilling allow inferring the major reservoir structure around the wellbore with great precision. Integrating in addition such measurements with surface seismic data enables to predict the reservoir structure ahead of the drill bit, supporting well placement and geosteering decision making. However, the available measurements can be exploited to their full potential only by performing this integration iteratively and in real time while drilling. Hence, a novel workflow is proposed, fully integrating borehole deep directional EM and 3D seismic data. In the predrill phase, it generates a detailed reservoir model repository, composed of reservoir horizons, faults, geobodies and fluid contacts from automated seismic extraction. During the drilling phase, the workflow iteratively updates both the seismic volume and the model repository; the updates are made calibrating the seismic to the depth of the resistivity image giving reliable information around the borehole and ahead of the bit. A real case example demonstrates that it is possible to predict consistently reservoir structural setting up to 150 m ahead of the bit, expected to be intercepted during drilling.