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--- wellsite_biosteer [20/03/2023 16:25] – mike_gss
+++ wellsite_biosteer [21/03/2023 13:15] (current) – mike_gss
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 //The basic components of a horizontal production well. With greater familiarity of the field, fewer (if any) pilot holes may be needed.//
-Joanne Field (UK North Sea) “Chasing the Reservoir”
+**Joanne Field (UK North Sea) “Chasing the Reservoir”**
 In the structurally complex Joanne Field of the UK North Sea, Holmes (1999) demonstrated that close analysis of the section reveals in situ claystone layers above and below the reservoir sand unit (which in itself is relatively unfossiliferous) which are separated by limestones containing re-worked older microfossils. Each unit can be fingerprinted by its specific type of in situ or re-worked component. A “combined biozonation” of in situ and re-worked forms can be constructed for the succession.
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 //Biozonation and events used on the Joanne Field (Holmes, 1999). The zones comprised intervals of in situ and reworked microfossils, each having slightly different compositions to allow correct identification.//
+{{:wellsite07.jpg?nolink|}}
+{{:wellsite08.jpg?nolink|}}
+//Two wells illustrating the complexity of the Joanne Field and the well trajectories "biosteered" to maximise exposure to the reservoir interval. Biostratigraphy allowed to quick return to the reservoir after frequent exits due to dip changes or structural features such as faults.//
 Because wellsite biostratigraphy was shown to be an effective tool at maximising reservoir exposure, the production strategy for the field was changed from plans to drill 16 conventional wells, to 9 “horizontal” wells resulting in an overall estimated saving of $12 million.