Aurelian


Poznan East and North, Poland
Blocks 207, 208 and (part) 206
Interest: 90%
Operator: Aurelian

Siekierki

The Siekierki structure is an asset with world class potential with up to 3.6 tcf of gas estimated to be in place in the main structure and up to 2.0 tcf in place in two satellite structures. Further upside exists on the unexplored block 208 which is adjacent to the recent PGNiG Grundy discovery.
 
The Company was awarded blocks 207 and 208 in 2003 and initially reprocessed a series of vintage 2D seismic surveys. In 2006 the Company acquired 300 km of 2D and in 2007 drilled Trzek-1, a vertical well that encountered a 90 metre gas column that tested up to 7.5 mmscf/d of gas. A further 300 km2 of 3D seismic was acquired in 2008 which led to GIIP estimates of 1.6 tcf (mid-case) and 3.6 tcf (high case) within the mapped area of the field.
 
In 2010, Trzek-2 was the first MFHW to be drilled in Poland and encountered a 100 metre gas column and approximately 1380 metres of gas through the horizontal section. A second MFHW, Trzek-3, was drilled in January 2011 targeting a separate high in the Siekierki structure.
 
In the south west corner of Block 207 lies the Krzesinki prospect, a satellite to the main Siekierki development. Krzesinki has a mid-case resource estimate of 60 bcf and a high case of 465 bcf. The Company is drilling an exploration well on this prospect in the summer of 2011.

Block 206, Poznan North, was awarded to the Company in 2009. In 2011, 85 km2 of 3D seismic will be acquired to determine a location for a planned well in 2012. This was the first time a 3D seismic survey has been carried out in an urban area in Poland. The concession is believed to contain an extension of the Siekierki field.

Horizontal well and fraccing

Oil and gas reservoirs normally have a very large area usually tens to hundreds of square kilometres. Thickness is however usually much less than 100 metres. This means that a vertical well will only contact 100 metres or less of reservoir while a horizontal well can be drilled to encounter a kilometre or more. Assuming the reservoir is uniform the horizontal well has much higher productivity. In practice the position is more complex since reservoir rocks are often layered, however about 60% of wells drilled are now horizontal.

A well is fractured (“fracced”) to increase oil and gas production. Special viscous fluids are pumped into a wellbore with powerful pumps at high pressure to crack the formation and fill the created fracture with sand or fine ceramic beads to hold it open when pressure is released. This process creates a very conductive pathway which allows the hydrocarbons to flow more freely into the wellbore.

 

 

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