Petrophysical appraisal and 3-D structural interpretation of reservoirs in an Onshore Niger Delta Field, Southeastern Nigeria
International Journal of Energy and Water Resources - Trang 1-13
Tóm tắt
Seismic and well log data were employed to carry out detailed 3-D structural interpretation and petrophysical appraisal of the “Sigma field” in the arcuate Niger Delta. The study was aimed at mapping the structural features that captured the geologic complexity and variability in order to predict the hydrocarbon potentials for detailed assessment of reservoir features within the Sigma field. The methodology applied included delineation of reservoirs from resistivity logs and gamma ray, well-to-well relationship, assessment of rock properties, mapping of faults and horizons, conversion from time to depth, and generation of structural maps of the reservoir top from time and depth. A network of faults (labelled F1 to F11) and two horizons (Sand F and Sand H) were identified and mapped. The growth faults delineated were F1, F2, and F3, while the subsidiary faults inferred were F4 to F11. Lateral continuity of reflection with middling to elevated amplitudes defined the horizons/boundaries at 2100 ms (Sand F) and 2500 ms (Sand H). The structural map shows an anticlinal structure supported by faults on the eastern part of the reservoir. The structures bearing hydrocarbon are fault dependent in nature, and they are principally based on the time and depth patterns of the mappable structures for the reservoir top considered. Well log reservoir correlation indicated that the reservoir has high lateral continuity. Petrophysical results revealed that the volume of shale fraction ranges between 0.118 and 0.220, total fractional porosity ranges between 0.220 and 0.304, permeability ranges between 443 and 574 mD, hydrocarbon saturation ranges between 0.592 and 0.714, and ratio of net to gross (NTG) spans from 0.380 to 0.710. The reservoir units exhibit significant-to-excellent porosity and good-to-very good permeability, based on the petrophysical evaluation. These results imply that the reservoirs constitute a productive hydrocarbon system. Altogether, the use of integrated and analytical techniques has offered accessible and detailed insight to the composition of geologic structures and distribution of quality of reservoir as well as minimizing subsurface reservoir uncertainty, which are paramount in petroleum exploration and exploitation.
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