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St. John's 2001
Technical Programme

SY1:  North Atlantic Margin Petroleum Resources 
Organizers / Organisateurs:  Iain Sinclair and Judith McIntyre
Room / Salle:  Reid

Date:  29/05/2001
Time:  8:20 AM
Presenter:  Eddie McAllister


Predicting the impact of fault damage zones on reservoir quality:  An analysis of structural, petrophysical and dynamic well-test data

McALLISTER¹, E., e.mcallister@rdr.leeds.ac.uk, PORTER¹, J.R., STYLIANIDES², G., SINCLAIR², I., KNIPE¹, R.J., FISHER¹, Q., CONDLIFFE¹, D. and KAY¹, M., ¹Rock Deformation Research, School of Earth Sciences, University of Leeds, Leeds, LS2 9JT, UK, ²Hibernia Management and Development Corp., St. John's, NF, A1C 6K3

Structurally controlled compartmentalisation within the Hibernia Reservoir sequence of the Giant Hibernia Field is a key element of the reservoir characterisation required to ensure effective pressure management over the production history of the field.

We present an analysis of the sub-seismic scale structure within the Lower Zone of the Hibernia formation in the Q and R blocks. Wells B-16 2 and B-16 4 are located close to acute fault intersection zones at the topographic apex of their respective blocks. Well positioning in both cases was planned to maximise the area and efficiency of sweep, with injectors located in the diametrically opposite corners of these rhombic compartments.

Structural intensity and style in both wells are consistent with organised clustered deformation associated with the sampling of damage zones to seismic, or just sub-seismic scale faults.  By integrating the levels of deformation within each of the reservoir zones with the distance from the mapped faults, and together with outcrop mapping from analogue fault zones, we have constructed a risk matrix for the width of the damage zone as a function of seismic-scale fault geometry.

The construction of a fault rock petrophysical database for the Hibernia reservoir, attained by measuring permeability and threshold pressures from faults sampled by the B-16 2 and B-16 4 cores, enables the prediction of the fault rock transmissibility, associated with the critical fault rock types.

We will present the damage zone risk-matrix, the fault rock petrophysical database and its application to a neighbouring reservoir block (i.e. V fault block), where poor production data is explained by structurally induced reservoir degradation as a result of a complex damage zone within an area of seismic-scale fault interaction. The resultant model has implications for well placement providing a balance between maximising the area of sweep and avoiding domains where elevated levels of deformation are likely to occur.