CASE STUDY Reduce risk and cost in frontier exploration
Challenge: Pore pressure prediction works best in areas where the sediments are young, rapidly deposited, contain similar clay content and are within low temperature environments much like those of Tertiary deltas. The ultra-deep water blocks of Cote d’Ivoire have additional geological complexities that therefore make pore pressure prediction more challenging such as, far offset wells outside survey area, high TOC clays, high geothermal gradients, high net-to-gross.
Solution: One of the key solutions to de-risk the ultra- and deep-water Blocks is to build a geologically sensible geopressure model. Such models rely on a detailed understanding of lithologies, facies and depositional models, e.g. the presence of deep-water turbidites, slope fan channels, stratigraphic pinch-out, and rotated fault blocks. The pressure model constructed must explain the current overpressure occurrences, taking into account the local geology and analogous areas (structure, stresses, temperature, basin history, sedimentation rates, and depositional architecture). Using the model we can then sense check any seismic velocity based interpretations.
Results: Accurate prediction of facies, reservoir properties and pressure. The well was complete on time and ahead of budget with best in class drilling performance and no NPT.