*Use of Seismic Inversion to Constrain the Heterogeneity of Reservoir Models in a Carbonate Environment – a Case Study from Al Shaheen Field Qatar

Henderson, J.R.¹; Huegen, C.¹; Cherrett, A.J.¹; and Emang, M.²

Abstract

The Al Shaheen Field is a giant field located offshore Qatar in Block 5 and Block 5 extension (Figure 1). It produces from a series of stacked reservoirs consisting mainly of carbonates including the Kharaib. The Kharaib reservoir is mature, with over 100 producers and injectors having been drilled since 1994, making it the most extensively drilled reservoir in Block 5. It is also the reservoir with most core and well log data, which allow the quantitative interpretation of the seismic data over the reservoir, including derivation of a porosity volume.

The dynamic behaviour of the reservoir is controlled by the permeability, with matrix behaviour being the most significant component. Development is increasingly being directed at areas of lower oil viscosity, which makes the prediction of permeability in target areas particularly important. Experience to date shows that permeability is largely dependent on porosity, and so estimation of porosity, including the range of uncertainties, plays a key role in developing an accurate dynamic model of the reservoir. A small number of wells are affected by local fractures.

AAPG Search and Discovery Article #90188 ©GEO-2014, 11th Middle East Geosciences Conference and Exhibition, 10-12 March 2014, Manama, Bahrain