INTEGRATION OF 3D SEISMIC AND WELL LOG DATA FOR THE EXPLORATION OF KINI FIELD, OFFSHORE NIGER DELTA

Initial interpretation of the available data in Kini-field offshore Niger Delta suggests huge uncertainty in the hydrocarbon volume. Thus, additional exploration procedure is required to minimize economic risk before progressing to the next stage of the field development. An independent interpretation of the 3D seismic data and well logs of the Kini-1 well was carried out to highlight the sources of the key uncertainties in the geology and make a necessary recommendation on additional data acquisition to minimize the uncertainties. Four oil-bearing grains of sand (A, B, C and D reservoirs) were identified for petrophysical evaluation. These sands have a good gross thickness ranging from 21 to 33 m and average net-to-gross (NTG) of 0.62. Porosity varies between 0.22 and 0.30 indicating good reservoir quality having hydrocarbon saturation (Sh) between 69 to 76 %. Kini-1 well did not encounter hydrocarbon water contact thereby creating uncertainty in the fluid contact, hydrocarbon column and in a way the extent of the hydrocarbon fluid in the reservoir. This study also revealed that the seismic data did not completely capture the overall extent of the reservoir structures as indicated in the top structure maps of the four reservoirs and thus could not properly describe the trapping system of the NW-SE striking anticline as well as the area extent of the hydrocarbon bearing zone because the northern arm of the structure was not captured by seismic. Few east-west striking synthetics (F1, F2, F3, F6, F7) and antithetic (F4, F5, and F8) faults identified in the southern part of the field did not appear to control the fluid entrapment in these reservoirs. Only low case gross rock volume (GRV) and hydrocarbon reserve (of 663 MMbl) were calculated using oil-down-to (ODT) of Kini -1 well because of the highlighted huge structural uncertainties do not permit base and high case estimates. Consequently, it was recommended that the result should not be used to make an economic decision unless until more data are available to minimize the risks. To minimize the highlighted uncertainties, additional 3D seismic data covering an area extent of about 1430000 square meters was proposed at the northern and eastern parts of the field. This is expected to fully capture the reservoir structure and help estimate the GRV more accurately. Two wells (Kini-2 and Kini-3) were strategically positioned to target the fluid contact, examine lateral variation in the petrophysical properties and ultimately yield a more reliable hydrocarbon volume estimates.