The Value of Regional Correlation and Analogues in Managing a Mature Asset: Examples from the Central Luconia Gas Fields

For Petroleum Geoscientists adequate use of analogues and sound methods of extrapolating properties to an exploration target or producing field are key tools to reduce subsurface uncertainties and improve prediction of overburden and reservoir behavior. An effective use of regional analogues is achieved by setting up a common correlation framework of a particular geological province, based on sequence stratigraphic principles. In addition, ancient outcrop and modern-day depositional analogues are used to improve the understanding of large-scale heterogeneities and reduce uncertainties in reservoir properties and flow behavior at the inter-well scale. This paper shows examples of applications of this methodology to the Central Luconia Gas fields: 1. Gas recovery factors depend on presence or absence of argillaceous tight layers formed during flooding events in a reservoir.Predicting these layers in platforms with limited core is possible through a sequence stratigraphic framework. This helps planning development wells and forecasting water-cut development. 2. In addition to subsurface data, ancient outcrop and modern-day depositional analogues are used in the Luconia gas reservoirs to improve prediction of reservoir properties away from well penetrations and help convert 3D seismic data into reservoir properties. Improved forecasting from these models enables integrated planning and facilitates asset management decision making.