Use of Time-Depth Conversion in Velocity Modeling of Well Data from an Onshore Field Dataset, Niger Delta Area, Nigeria

Abstract

The estimation of subsurface velocity is very important in seismic reflection as it controls the quality of the depth images, which is the basis of most geological interpretation. In this paper, time depth conversion technique had been used to develop a one-dimensional velocity model of an onshore field, using a layer-cake method in creating the model and seismic interpretation program to build the velocity model. The Sonic data and the checkshot data of field obtained were converted to time images to represent the true geological depth. The resulting velocity obtained from the model ranges from 188-2677ms^-1, which is a true reflection of the subsurface layers velocities (from the unconsolidated to consolidated layers velocities) of most Niger Delta area.