Hydrocarbon reservoir characterization of 'Keke' field, Niger Delta using 3 seismic and petrophysical data

摘要

An integrated 3D seismic and petrophysical data was employed to evaluate hydrocarbon reservoir potentials of "Keke" field in the Niger Delta. Two sands units (S1 and S2), which exists between 9127ft and 11152ft were correlated and mapped using gamma ray log while petrophysical parameters were obtained from other well logs. The sand units were further mapped on the seismic sections. Seismic structural attribute (variance) was used to delineate six major faults in the field. Time and depth maps were generated for both top and base of the horizons from which the isopach map was derived. Hydrocarbon in-place was calculated from the obtained seismic and petrophysical parameters in order to unveil the potentials of the reservoirs. Delineated sand units, S1 and S2 are characterized by hydrocarbon saturations of 65% and 81.8% respectively. Isopach map show thicker sediments in the central and southern parts of the field ranging from 70ft to 90ft, isochron and isodepth revealed structural high (anticlines) at the central fault block of the field sandwiched between the growth faults, which are responsible for possible hydrocarbon accumulation. The trapping mechanisms are fault-assisted and rollover anticlines. Hydrocarbon in-place for Sand S1 was estimated to be 14.6million ft3 of gas and 6,011.3 bbl of oil while Sand S2 showed 512.3764 million ft3 of gas and 6041.94 bbl of oil. The results show that the trapping mechanisms and the obtained Petrophysical parameters in "Keke" field are favourable for hydrocarbon accumulation. Estimated reserves are satisfactory for further exploration work.