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Understanding Fractured Reservoirs & Rocks

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Tuesday, January 23, 2018

Video Presentation

Establishing, predicting and modelling the hydrodynamic fracture network of basement reservoirs during the exploration and early appraisal phase. A Case study from the West of Shetland Lancaster Field

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Dr Robert Trice
Hurricane Energy

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Talk Description
Productive naturally fractured basement fields typically owe their hydrocarbon accumulations to the trapping mechanisms of buried hills and faulted margins. Basement reservoirs are therefore associated with large gross rock volumes and predominantly well-defined seismic signatures.

Whilst the GRV envelope may offer relatively obvious drilling opportunities the success of exploration and appraisal drilling is dependent on the presence and sampling of a hydrodynamic fracture network the fluid flow properties of which are controlled by three key reservoir characteristics: (a) fracture connectivity; (b) the relative magnitude of fluid pressure and lithostatic pressure; and (c) the magnitude and orientation of the mean stress across the hydrodynamic fracture network.

Geologists are therefore obliged to work with an understanding of these three key reservoir parameters and with global and local knowledge related to the specifics of naturally fractured basement.

This case study presents how Hurricane has established a practical understanding of the key parameters that describe the hydrodynamic fracture network at Lancaster and used that understanding to predict where and how to place two successfully tested production wells.

Dynamic and static modelling of the Lancaster field has led to reserve estimates which will be evaluated through an early production system.

The early productions system is designed to be the first phase of a full field development targeting oil in 2019. The case study will present the philosophy and techniques that have been applied to evaluating Lancaster and will summarise the near-term data acquisition that will further aid in the prediction and modelling of the Lancaster hydrodynamic network.

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