Why does my summary forecast have “stairsteps”?
A. When summing multiple leases, the historic production from each lease is summed on a phase-by-phase basis. The forecasts which are defined for each phase for each lease are also summed. Before summing the leases, all adjustments to the decline-curve forecasts should be made on a lease-by-lease basis. Differing start dates will produce a stair-step upward profile, where each step corresponds to the initial handle position for a curve contributing to the sum. You can optionally start the display of the summary forecast at the effective date. Right click on the graph, select Properties, General tab. (A stair-step downward profile results as each lease reaches its economic limit, illustrating the decrease in number of economic leases.) A forecast summed within PowerTools cannot be modified, as there is no means for allocating the production back to the lease level.
