2 - Traps, Maps and Contouring Lecture 2

2 - Traps, Maps and Contouring Lecture 2 - PETE 3053 –...

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Unformatted text preview: PETE 3053 – SUBSURFACE ASPECTS OF PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Trapping Examples, Maps and Contouring PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Contour line A line that connects points of equal value. Equal values of what? Elevation Thickness Net Pay Pressure Temperature Production PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Contour Map Types of Contour Maps Any map that uses contour lines as a way of depicting a 3­dimensional surface or solid as a 2­ dimensional plan view. Structure Fault Isopach Isobar Isotherm Isolith From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 From Tearpock et al 1991 PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Rules of Contouring 1. A contour line cannot cross itself or any other contour except under special circumstances. 2. A contour line cannot merge with contours of the same value or different values. 3. A contour line must pass between points whose values are lower and higher than its own value. 4. A contour line of a given value is repeated to indicate reversal of slope direction. 5. A contour line on a continuous surface must close within the mapped area or end at the edge of the map. From Tearpock et al 1991 From Tearpock et al 1991 PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Contouring Guidelines 1. A contour map should have a chosen reference. 2. The contour interval should be constant. 3. All maps should include a graphic scale. 4. Fifth contours should be wider. 5. Hachured lines indicate closed depressions. From Tearpock et al 1991 From Tearpock et al 1991 PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Contour Map Construction 1. Start contouring in areas with maximum control. 2. Construct contours in groups rather than one at a time. 3. Choose the simplest reasonable solution. 4. Use a smooth style of contouring. 5. Contour in pencil. 6. Use overlays. From Tearpock et al 1991 From Tearpock et al 1991 PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM PETE 3053 – SUBSURFACE ASPECTS OF PETROLEUM ENGINEERING Methods of Contouring 1. Mechanical Contouring The slope or angle of dip is assumed to be constant between points of control and any change occurs at the control points. Spacing is proportional. 2. Parallel Contouring The slope or angle of dip is not assumed to be constant. Spacing may vary. 3. Equal­Spaced Contouring The slope or dip is assumed to be uniform over an entire area. 4. Interpretive Contouring Examples Examples Structure and Net Oil Isopach From Tearpock et al, 200 From Tearpock et al, 2003 From Tearpock et al, 200 From Tearpock et al, 2003 From Tearpock et al, 2003 From Tearpock et al, 2003 From Tearpock et al, 2003 ...
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This note was uploaded on 02/01/2011 for the course PETE 3053 taught by Professor L during the Spring '11 term at LSU.

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