2) North-South-Oriented Vertical Slices of 3-D Porosity

Table of contents | Glossary | Geology | Depositional model | Heterogeneity | Diagenetic history | Petroleum geology | 1) East-West porosity slices | North-South porosity slices | 3) Onion views of 3-D images | 4) Horizontal slices of porosity | 5) Horizontal and East-West permeability and porosity slices

GIF graphic images are stored in the 3dgifns (3-D north-south-oriented GIF files) directory. GIF and TARGA files located in folders are named and numbered such that external viewers can correctly sequence files. Images can be displayed as slide shows using an external viewer, such as JPEGView or LView, or can be accessed as the nsporvf.MOV (north-south vertical porosity slices, single forked) stand-alone movie in the movies folder. Movies are called up much quicker directly from the folder than using the below text hook, although the animation speed is similar.

Technical information on data sources and methodologies is stored in techinfo.htm. Access and start the movie with north-south movie (nsporvf.MOV). Before the movies can be opened, you may need to copy to your hard drive a movie-viewing program; information on how to acquire this freeware and software is listed in the readme for movies file.

The above image is north-south-oriented vertical slice 7 of the Sussex "B" sandstone (slice 7 is located at X-axis location 40,000 m on the following index map). The 3-D model is rotated clockwise about 30 degrees. Yellow dots are borehole and sample locations. The below index plan-view map shows cumulative oil production. Also shown are location and orientation of the slice; these index maps are included on each image. Illustrated on the above map are:

1. Two separate sand ridges that are compartmentalized by low-porosity (blue) mudstone and sandstone, which are the basal low-depositional energy facies of sand ridges,

2. Concentration along the field axis of greatest oil production and thickest intervals of reservoir-grade sandstones (green through red colors, 8.5 to 21 percent porosity). Greatest oil production is from intervals exhibiting greater than average porosity of reservoir sandstones (yellow through red, 12 porosity to 21 percent porosity).

3. Landward (to the left) backstepping of the upper over the lower sand ridge, and

4. General lens shape of reservoir-grade intervals and variable thickness of the Sussex "B" sandstone and its components across the field.

Slide show images north-south-oriented vertical slices are spaced at 500-m (1,524 ft) intervals; spacing is approximate on the above map. Explanation and index map are displayed on images. Color bars list porosity in increments of 1 percent and contours of 40 MBO per well; a barrel of oil is equivalent to 42 U.S. gallons (158.76 liters). Vertical exaggeration of the 3-D porosity model is 60 times.

Slice 1) X Axis is 43,000 m

Slice 2) X Axis is 42,500 m

Slice 3) X Axis is 42,000 m

Slice 4) X Axis is 41,500 m

Slice 5) X Axis is 41,000 m

Slice 6) X Axis is 40,500 m

Slice 7) X Axis is 40,000 m

Slice 8) X Axis is 39,500 m

Slice 9) X Axis is 39,000 m

Slice 10) X Axis is 38,500 m

Slice 11) X Axis is 38,000 m

Slice 12) X Axis is 37,500 m

Slice 13) X Axis is 37,000 m

Slice 14) X Axis is 36,500 m

Slice 15) X Axis is 36,000 m

Slice 16) X Axis is 35,500 m

Slice 17) X Axis is 35,000 m

Slice 18) X Axis is 34,500 m

Slice 19) X Axis is 34,000 m

Slice 20) X Axis is 33,500 m

Slice 21) X Axis is 33,000 m

Slice 22) X Axis is 32,500 m

Slice 23) X Axis is 32,000 m

Slice 24) X Axis is 31,500 m

Slice 25) X Axis is 31,000 m

Slice 26) X Axis is 30,500 m

Slice 27) X Axis is 30,000 m

Slice 28) X Axis is 29,500 m

Slice 29) X Axis is 29,000 m

Slice 30) X Axis is 28,500 m

Slice 31) X Axis is 28,000 m

Slice 32) X Axis is 27,500 m

Slice 33) X Axis is 27,000 m

Slice 34) X Axis is 26,500 m