The Odoptu-more field has a very complex geology and the main challenge for geosteering is asymmetric anticline structure which gives significant increase in structural uncertainty with increasing length of horizontal section. In the area of western anticline slope (more remote from the shore) formation dip can vary from 0 to 7 deg. Such challenging environment limits the length of horizontal section on the project by 500 m. In spite of such complicated drilling and geological condition Rosneft took the challenge – planed 7100 m long horizontal well with longest drain in the field – 1000m. This paper describes how this task was successfully executed utilizing “Model-Compare-Update” and “Distance to boundary” geosteering methods and compares the weight of each method in decision making process in different geological environments.


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