Detailed Petrophysical studies and Sequence stratigraphic analyses of three wells in the ‘Indigo Field of Niger Delta was carried out using wireline logs and high resolution biostratigraphy. Three sequence boundaries (SB 27.3Ma, 29.3Ma and 32.4Ma) and maximum flooding surfaces (MFS 26.2Ma, 28.1Ma and 31.3Ma) were identified. Three systems tracts were delineated in wells A and B, while only two were delineated in well C. Nine reservoir units (A1-A9) analyzed in well A show porosity, permeability and Vshale of 13-18%, 89.35-2775.8md and 0.026-0.05v/v decimal, respectively. Reservoirs A1, A4, A7, A8, and A9 contain oil, A2 and A3 contain gas, and A5 and A6 contain water. Porosity and Vshale values for three reservoir units in well B (B1-B3) are 16-25% and 0.03-0.045v/v decimal, respectively. Reservoirs B1 and B2 contain water, and B3 contains gas. Six reservoir units (C1-C6) delineated in well C have average porosity, permeability and Vshale values of 19-24%, 1063.92-3674.4md and 0.05-0.1v/v decimal, respectively. Reservoir C1 contains oil and water; C2, C3 and C6 contain only water, and C4 and C5 contain oil only. Water saturation, moveable hydrocarbon index (MHI) and net sand count were 14-79%, 0.42-0.46, and 6-40m respectively, in well A; 24-65%, 0.55-0.56 and 7-26m in well B; and 21-67%, 0.44-0.54 and 11-22m in well C. Well A, being with thicker and more porous sands with lower Vshale is more productive than wells B and C.

Keywords:
log analysis, structural geology, greater ughelli depobelt spe 128353, well logging, Niger Delta, petrophysical evaluation, Reservoir Characterization, Upstream Oil & Gas, odokoh spe 128353, system tract
Subjects:
Reservoir Characterization, Formation Evaluation & Management, Exploration, development, structural geology, Open hole/cased hole log analysis
Copyright 2009, Society of Petroleum Engineers
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