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N orwegian Continental Shelf and ED50

N orwegian Continental Shelf and ED50. Use of ED50. Subjects. Why this presentaton Many ways to display your position What is a datum Navigational charts Jens Evensen and continental borders Why do we use ED50 on Norwegian Continental Shelf

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N orwegian Continental Shelf and ED50

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  1. Norwegian Continental Shelf and ED50 Use of ED50

  2. Subjects Why this presentaton Many ways to display your position What is a datum Navigational charts Jens Evensen and continental borders Why do we use ED50 on Norwegian Continental Shelf Seismic interpretation and well trajectory (D&W) Projection of ED50 Datum transformation (dimensions and errors) Examples

  3. Why this presentation? What is ED50? Why is ED50 used, why not GPS? Is latitude and longitude ED50? What is this UTM? Is it a big difference between thoose two?

  4. Many ways to display your position Geocentric coordinates X, Y, Z Origo in earth center No ellipsoid used Geographic coordinates Latitude Φ, Longitude λ Origo in earth center No ellipsoide used UTM coordinates North/South, East/West Origo at equator and given central meridian Need ellipsiod

  5. Many ways to display your position

  6. What is a datum Norwegian datum • NGO1948 • ED50 • WGS84 • EUREF89 Origo Perpendicular axes

  7. Navigational charts • Up to 1957 • NGO1948 • 1957 – 1992 • ED50 • From 1992 • WGS84

  8. Jens Evensen and continental borders • Norway <-> UK • March 10th 1965 • Navigational chart no. 301 • 1 : 1 000 000 • 8 points defining border • Norway <-> Denmark • December 8th 1965 • Navigational chart no. 301 • 1 : 1 000 000 Carl Erik Fleicher, Erik Løddesøl

  9. Why do we use ED50 on Norwegian Continental Shelf

  10. Why do we use ED50 on Norwegian Continental Shelf Aktivitetsforskriften Veiledning § 82 For å oppfylle kravet til brønnens lokasjon og bane som nevnt i første ledd, bør standarden NORSOK D-010 kapittel 4.3 og 5.7.4 brukes, med følgende tillegg: brønnens lokasjon og bane bør angis i Universal Transverse of Mercator (UTM)-koordinater. • § 82 • Brønnens lokasjon og bane skal være kjent til enhver tid og velges på grunnlag av brønnparametere som har betydning for en sikker bore- og brønnaktivitet.

  11. Why do we use ED50 on Norwegian Continental Shelf 5.7.4.2 Well trajectory measurements The following apply: a) The surface location coordinates of the well bore center shall be determined with use of differential global positioning system. Well slot co-ordinates can be established by measurements from a known reference point (fixed point on a platform, sub sea template, etc.). b) During drilling of new formation, measurement of well bore inclination and direction shall be obtained at least every 100 m MD. All survey plots should be referenced to grid north. c) The position of the well bore being drilled (reference well) and the distance to adjacent wells (object well) shall be known at all times. The minimum curvature method or other equivalent models should be used. d) A model for quantifying the uncertainty shall be established. The probability for the well bore to be within the calculated uncertainty ellipses should exceed 95 %. e) Minimum acceptable separation distance between well bores and risk reducing actions shall be defined.

  12. Why do we use ED50 on Norwegian Continental Shelf • Norwegian Petroleum Directorate (OD) • Registration of wells • Datum to be used is ED50, geographical coordinates • (no accuracies required)

  13. Seismic interpretation and well trajectory (D&W) Large fields High accuracy Shallow gas pockets • 1021km2

  14. Projection of ED50 ED50 (International 1924) WGS84 Semi-major axis a = 6 378 137m Semi-minor axis b = 6 356 752.314m Flattening = 1/298.257223563 • Semi-major axis a = 6 378 388m • Semi-minor axis b = 6 356 911.946m • Flattening = 1/297.0

  15. Projection of ED50 Transformation Parameters • Translation • Rotation • Scale factor

  16. Datum Transformation • We start with following position 61°04'54.5"N 2°29'49.9"E • Dose this position tell you where you are?

  17. Datum Transformation • NO • If we add following information DATUM ED50

  18. Datum Transformation YES What with theese coordinates? Northing 6477873.916 m Easting 437502.434 m

  19. Datum Transformation NO If we add following information Northing 6477873.916 m Easting 437502.434 m DATUM ED50

  20. Datum Transformation NO If we add following information Northing 6477873.916 m Easting 437502.434 m DATUM ED50 UTM Zone 31N

  21. Datum Transformation YES Northing 6477873.916 m Easting 437502.434 m DATUM ED50 UTM Zone 31N

  22. Datum Transformation Best practise to display a position UTM Coordinates Northing 6477873.916 m Easting 437502.434 m DATUM ED50 UTM Zone 31N CM003E Geographical Coordinates DATUM ED50

  23. Datum Transformation • GPS receivers will normally output WGS84 datum • GPS raw data are processed by a navigation SW. This SW will be set up to convert WGS 84 into the requiered datum. • For Datum transformation Statoil use mainly two different programs to convert between different datums • Geomatrix Inca • Blue Marble Desktop

  24. Examples Lets look at som error figures between WGS84 and ED50

  25. Examples ED50 UTM Zone 34N CM21E ESPG 1612 (N62) Lat :71°35'30.975" Long :21°16'33.860" Northing :7943655.0 m Easting :509730.7 m WGS84 UTM Zone 34N CM21E ESPG 1612 (N62) Lat :71°35'31.507" Long :21°16'28.367" Northing :7943456.0 m Easting :509676.3m • Distance between theese two positions • 56.3m

  26. Examples ED 50 UTM Zone 31N CM03E ESPG 1613 (S62) Lat : 58° 26' 08.80"N Long : 01° 55' 46.80"E Northing : 6 477 873.9 m Easting : 437 502.4 m WGS84 UTM Zone 31N CM03E ESPG 1613 (S62) Lat : 58°26'06.59"N Long : 1°55'41.11"E Northing :6477658.8 m Easting :437412.2 m • Distance between theese two positions • 114,8m

  27. Examles

  28. Expamles

  29. Expamles

  30. Expamles

  31. Examples Difference between WGS84 and ED 50 in the Norwegian continental shelf are between 50 and 300 meters.

  32. Norwegian Continental Shelf and ED50 Bength Eriksen Senior Surveyor E-mail: beneri@statoil.com Tel: +47 936 92 070 www.statoil.com

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