RTA Sensitivities

Introduction

For both oil and gas RTA and FMB, the sensitivities are generated by evaluating the hydrocarbon-in-place such as OGIP and OOIP. Productivity parameters such as permeability and or skin are back-calculated accordingly.

In the oil example below, the OOIP ranges from 3000 MSTB (low) to 5000 MMSTB (high). Permeability follow a similar pattern, but this is not always the case.

Low Case	High Case	Mid Case
OOIP = 3000 MMSTB Drainage Radius = 1960 ft Permeability = 0.99 md Wellbore Skin and Formation Damage = -5.06	OOIP = 4220 MMSTB Drainage Radius = 3003 ft Permeability = 1.20 md Wellbore Skin and Formation Damage = -4.47	OOIP = 5000 MMSTB Drainage Radius = 3250 ft Permeability = 1.21 md Wellbore Skin and Formation Damage = -4.41