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Subsurface Mapping and Geosteering at Reservoir Scale with Extra-Deep Azimuthal Resistivity in the Akpo field, Nigeria
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Conference on Deepwater Equatorial Margin: New Energy Frontier for South America, Aug 2023, Volume 2023, p.1 - 6
Abstract
Summary
The deepwater Akpo field consists of multiple shale-bound sandstone reservoirs, in a setting typical of deep-water turbidite channels and lobe complexes. The target reservoir was identified and delineated by means of 3D seismic data; however, uncertainties remain about its actual thickness and internal architecture of the reservoirs. To reduce these uncertainties, and improve the understanding of the reservoir structure, multi-component inversion resistivity processing was performed on conventional Azimuthal Resistivity and Extra-Deep Azimuthal Resistivity data. Inversions showed that the wellbore initially crossed a sequence of small, isolated sand bodies with a markedly lenticular shape, bound by thick shales and interpreted as channel fills within a sedimentary environment dominated by shale deposition. As drilling progressed, the sand bodies increased in thickness and lateral continuity, while the shale intervals rapidly became thinner partitions within a massive sand-dominated body, likely consisting of amalgamated sand turbidites. The subsurface architecture mapped by the inversions appeared consistent with the interpretation of 3D seismic data. Well production data confirm that the integration of data from Logging While Drilling tools, Multi-Component While-Drilling inversions and seismic interpretation helped optimizing the well placement in a complex geological setting.
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