Displaying seismic data in the form of a predicted well log for a planned well trajectory to make interpretation easier for a drilling rig operator

摘要

A method of processing geological data (especially seismic data) comprising a plurality of geological surfaces (e.g. strata horizons 1, faults 2) within a geological volume includes (i) specifying a well trajectory 3 which extends through the geological volume; (ii) identifying the geological surfaces within the volume which are intersected by the trajectory; (iii) determining, for each intersected surface, the depth, the dip angle and the dip direction of the surface at the point of intersection with the trajectory; and (iv) predicting a well log for the trajectory, the log specifying the depths, dip angles and dip directions of the intersected geological surfaces. Results from experimental well logs (e.g. MWD or gamma-ray logs) can be used to update the predicted well log. The well log enables a drilling rig operator to know what geological structures will be encountered on a particular well trajectory, rather than having an overview of the entire geological volume.