This study focuses on the use of geosteering technology in the optimal placement of wellbore path in Agbada 61 reservoir formation, where geological or subsurface target is far less than 100 m and where conventional approach could not be applicable. This was achieved by the formulation of a predrilled formation model from existing nearby or offset well by invertion of the resistivity log use in Agbada well 61, to get a squared Rt (true resistivity) profile (together with dip angles, to populate the aforementioned formation model). Then this tool response was calculated along the designed well path in stated formation model derived (that is, D7 sand). It was observed that exploitation of the D7 reservoir by using a slant well as advised by the operator would have placed the well path in the water zone but a horizontal well would exploit D7 reservoir sandstone optimally by placing the well path 10.7 ft away from the pseudo-water contact.
Key words: Geosteering, horizontal drilling, offset well, true resistivity.
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