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Find the oil. This section contains some possible interpretations for the find the oil exercise.

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find the oil

Find the oil

This section contains some possible interpretations for the find the oil exercise.

The interpretation is available on both black and white and colour sections. The solutions are the same on both, however please note these exercises are for teaching purposes only and are not intended for commercial use.

slide2

This is the completed stratigraphic column for the Weald area.

The exercise asked you to find 3 marker horizons, think about what sort of exploration feature these horizons could be (e.g. source, reservoir or cap):

Purbeck Sandstone

Kimmeridge Clay

Corallian Limestone

-possible reservoir rock

-possible source and cap rock

-possible reservoir rock

You can use the stratigraphic column available on the geology page of the case study to find out. Click to reveal the answers.

Extension: The Kimmeridge clay is organic rich and therefore a possible source rock. For it to be a cap rock as well, either another source rock lower in the stratigraphic column is needed (can you suggest any other sources?), or hydrocarbons from the Kimmeridge Clay elsewhere in the basin could have accumulated up dip.

The idea that Kimmmeridge Clay from elsewhere in the basin could be the source shows that it is important to consider depth of burial and hydrocarbon maturity as well as structural relationships.

Click here to see a map of hydrocarbon maturity in the Weald Basin.

slide4

Interpretation of marker horizons

Purbeck

Sandstone

Kimmeridge

Clay

Corallian

Limestone

slide5

Faults marked in black

Can you see any other structures that are associated with structural traps?

slide6

Anticline

There is an anticline on this seismic profile. Click to reveal it.

slide7

Locating an exploration well

Perhaps here for the

Corallian Limestone

This is a possibility for the Purbeck Sandstone

Would you drill for oil or gas on this structure? If so, where? Click to reveal the best location.

slide8

Another scenario

Look at the central area of the anticline, some extra faults have been picked there. Does the trap look so reliable now?

conclusions
Conclusions
  • The results of seismic interpretation can be varied. It depends upon the person doing the interpretation.
  • Deciding where to drill is a long and complex procedure that sometimes takes many years.
  • Not all exploration wells are successful. See the article on a North Sea dry well for July 2009 with this link: StatoilHydro article
slide11

Interpretation of marker horizons

Purbeck

Sandstone

Kimmeridge

Clay

Corallian

Limestone

slide12

Faults marked in black

Can you see any other structures that are associated with structural traps?

slide13

Anticline

There is an anticline on this seismic profile. Click to reveal it.

slide14

Locating an exploration well

Perhaps here for the

Corallian Limestone

This is a possibility for the Purbeck Sandstone

Would you drill for oil or gas on this structure? If so, where? Click to reveal the best location.

slide15

Another scenario

Look at the central area of the anticline, some extra faults have been picked there. Does the trap look so reliable now?

conclusions16
Conclusions
  • The results of seismic interpretation can be varied. It depends upon the person doing the interpretation.
  • Deciding where to drill is a long and complex procedure that sometimes takes many years.
  • Not all exploration wells are successful. See the article on a North Sea dry well for July 2009 with this link: StatoilHydro article