Q31-36
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Transcript of Q31-36
Play models in Quadrants 31-‐36 in Norwegian North Sea
This presenta,on is made to give some few examples of tested and untested play models in the North Sea. No accurate loca,on is given in both stra,graphic nor XY coordinates. Valioso Ltd and its authors is not to be held responsible for any inaccuracies and errors in material presented herein, and therefore not responsible for any ac,ons by any party based on these ideas presented in this presenta,on.
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Valioso (UK) Ltd has iden,fied 9 lead opportuni,es. These opportuni,es are outlined in map on previous slide.
Lead 1 is iden,fied within Blocks 31/3 and 32/1 and is iden,fied as a large ,lted fault block at Upper Jurassic and Middle/Lower Jurassic levels. This lead could contain a Upper Jurassic/Lower Cretaceous stra,graphic lead associated with it. • Lead 2 is iden,fied within Block 36/10, as a Middle/ Lower Jurassic ,lted Fault Block. • Lead 3 is iden,fied within Block 36/7 as Upper Jurassic and Lower Cretaceous lead. • Lead 4 is iden,fied within Block 36/7 same type as Lead 3. • Lead 5 is iden,fied within Blocks 35/8 and 35/9, mainly in laXer Block. This is a Lower Cretaceous Lead • Lead 6 is iden,fied as Jurassic lead within Block 35/8 • Lead 7 is iden,fied as Jurassic lead within Block 35/9 • Lead 8 is a Jurassic lead iden,fied within Blocks 35/8 and 35/5, mainly the first block. • Lead 9 in Blocks 36/4 and 36/7 is assumed to be Ap,an Sand wedge stra,graphic trap. Associated with this lead is several other leads found in same geographic area, although various levels from Jurassic and upwards, even poten,al Basement traps. GIIP approximately 25 x 109 Sm3.
• Lead 10 is a Upper Jurassic and Lower Cretaceous lead, which has a fair to medium size, main risk is trap integrity as Base Seal can be destroyed in these leads. Its believed to be gas prone. • Lead 11 is a Upper Jurassic/Lower Cretaceous lead, with small to fair size, main risk is source. The lead is supposed to be gas prone. • Lead 12 as lead 11. • Lead 13 is a Upper Cretaceous lead, with same characteris,cs as lead 10. • Lead 14 and 15 are Triassic to Lower/Middle Jurassic leads, with a poten,al for Upper Jurassic in Lead 15. Main risk is trap integrity due to fault dependency to make medium to large volumes, otherwise the risk is moderate to small volumes. Reservoir characteris,cs are also a maXer of concern. • Lead 16 is a Triassic together with poten,al other levels in same area. Main risk is reservoir together with trap integrity.
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Several par,es have studied the petroleum system of the Tampen Spur – Sogn Graben area. The approaches used are 1D and 2D analysis of seismic in the area where various hypotheses could be tested and later applied in a 3D. The area ranges from the deepest part of the `Tampen Graben' across the Visund Ridge and the Marflø Ridge to the Sogn Graben in the east. Four source rocks have been taken into account, two marine the Draupne Forma,on (the most prolific) and the Heather Forma,on and two deltaic, the Brent and the Dunlin Forma,ons. Several different prospect types can be defined: the Brent at the top of the ,lted blocks and several genera,ons of Heather Forma,on sand bodies at the foot of the eroded ,lted blocks. In addi,on there are Lower and Upper Cretaceous transgressive and lowstand playmodels to be explored. Cri,cal elements are the geometry of sand bodies and migra,on of hydrocarbons from the rich Draupne Forma,on source rocks into the sands in the various trap types. Matura,on is believed to have started in the middle Cretaceous, between 100 Ma in the deepest eastern part of the sec,on (Sogn Graben) and 80 Ma for the Draupne Forma,on on the Tampen Spur west graben. At this ,me, the Cretaceous shales already sealed the structures. Apart from the Visund Ridge and flankal areas of Sogn Graben, all the prospects at Upper Jurassic or deeper are currently in the condensate or gas window. Overpressures are compa,ble with large closed fault systems. Possible sealing of minor faults before migra,on could be cri,cal in this region. There is no easy migra,on path from the rich Draupne Forma,on rocks to the reservoirs and various hypotheses are found to explain the regional petroleum poten,al. One possible explana,on for the regional charge is the contribu,on of the other source rocks, the Heather, the Brent and the Dunlin. Upper Jurassic The Upper Jurassic consists mainly of marine shales with coarser clas,c sequences developed locally. The contact between Draupne and Heather shales are ojen abrupt. The Draupne Forma,on is organic rich and highly radioac,ve. The Viking Group, consis,ng of both Heather and Draupne Forma,ons, has become more complex due to discoveries of different sand forma,ons within the group. The coastal to shallow marine sandstone units named Sognekord, Fenskord and Krosskord Forma,on sands are the most common reservoir units with Upper Jurassic sequence Lower Cretaceous In this interval at least two separate sandstone units can be detected both in wells and seismic. The Åsgard and Agat Sandstones. The Åsgard sand Unit is intrpreted as a highstand systems tract unit; as for the Agat sand Units, which are stacked, sandy units are intrepeted as lowstand systems tract units. In NPD nomenclature the sandstone units are named Ran sandstones for the Viking Graben system. Upper Cretaceous Kyrre sandstones (99), has been penetrated in quad 35 by wells, and exhibits good reservoir quali,es and found hydrocarbon bearing. This sandstone unit, could consist of several sub-‐units, and its distribu,on together with reservoir quality is per,ent to know, in order to understand its play feasibility.
For further details you can contact Valioso Ltd and its author for further discussions and consulta,ons.
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