TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe North Sumatra Offshore (NSO) field is a large gas field that supplies gas to the P. T. Arun Liquified Natural Gas (LNG) plant in Aceh, Indonesia. The field came onstream in 1999 and produces about 450 MMscf/d currently. The field has produced about 34% of the Original Gas In Place (OGIP) as of 1/1/2007, and the ultimate recovery is expected to be around 75%. The producing carbonates have an average porosity of 23% with zones of higher porosity at the top of the reservoir. Geomechanical testing of Malacca limestone cores indicated that the rock has high compressibility and suffers elastic and significant plastic deformation when mechanical stresses are increased.This paper presents results of the core analyses, the geologic, petrographic and stratigraphic description of the NSO carbonates, and the development of a reservoir simulation model that incorporates the rock mechanical properties, fluid flow properties and surface facilities models to history match NSO production and reservoir pressure behavior. The impact of porosity and permeability reduction by plastic deformation on field production is also examined. Rock compaction is shown to be an important mechanism for matching the NSO production history and it provides part of the support needed to explain the higher than predicted reservoir pressures. Aquifer influx is shown to be the other support mechanism that is essential to matching the field performance.
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