Introduction to the Petroleum Resources Management System and the implications for the geophysical community

Exceeding the estimated technical UR of mature fields is a valid positive risk to be considered in field development. Extending the field life of prolific fields in the Niger Delta using integrated subsurface analysis of available data is an imperative in the current "lower price for longer" oil economy. For matured reservoirs producing beyond their estimated ultimate recovery, it is necessary to demonstrate the basis on which a revision of recovery factors can be made (SPE et al., 2007). This paper examines how the seismic, geological, production data and pressure data were integrated to arrive at the most plausible reservoir understanding for the re-allocation of In-place volumes for the Tanure field in the Western Niger Delta. An integrated review of the field history was done on a well- by- well basis, taking into account the cross -sections and relative positions of both flowing and closed -in wells. The CO log data analysis showed the relative movement of the water influx in the field, helping to identify wells that had been shielded by sealing faults, explaining observed production performance. The pressure equivalence of the hitherto separate sub-blocks in the field proved that 75 of the sub-blocks on the various reservoir sand levels could be technically merged into 24 larger blocks. The average contacts for the new sub-blocks were estimated by petrophysical analysis of original contacts observed from open hole log data. The re-interpretation of 3D seismic and the fault model of the geological structure, led to the revision of Stock Tank Oil Initially In Place (STOIIP) estimates to support the production figures from the maturing field (SPE/WPC, 2001). Fluid contact analysis estimated OWCs for the resulting new blocks, confirmed by pressure data history from the field. The technical recovery limits for the affected blocks were revised based on the calculated STOIIP volumes of the new blocks.

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Re-Allocation of Reservoir Blocks Hydrocarbon In-Place Volume Based on Reservoir Performance and Subsurface Data Analysis in a Mature Field

Ori-Jesu

Olagunju

Agwuncha

et al. 2017

Day 2 Tue, August 01, 2017

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Introduction to the Petroleum Resources Management System and the implications for the geophysical community

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Re-Allocation of Reservoir Blocks Hydrocarbon In-Place Volume Based on Reservoir Performance and Subsurface Data Analysis in a Mature Field

Re-Allocation of Reservoir Blocks Hydrocarbon In-Place Volume Based on Reservoir Performance and Subsurface Data Analysis in a Mature Field

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