Rock Typing and Permeability · Module K8
Hand-offs and the capstone
The closing module adds the fourth route, a small network trained on plugs and judged on its held-out estimate, and compares all four routes against core and against the course well's truth. It carries the chosen curve into net pay with a permeability cut-off, the three permeability averages and k·h against drill stem tests, converts a permeability cut-off to the equivalent porosity cut-off, and hands rock-type numbers to the saturation-height model. The capstone runs the whole study on one well.
- Level
- Advanced
- Position
- Module 8 of 8
- Video
- About 18 minutes, narrated
- Format
- Narrated video lesson with captions and slide reading view; with the certified option, a quiz whose pass unlocks the next module.
What the module covers
- A network trained on plugs, judged on held-out data
- Every route scored against core and truth
- Net pay with a permeability cut-off
- Arithmetic, harmonic and geometric averages
- Log k·h against drill stem test kh
- Capstone: from plugs to the saturation-height hand-off
Learning outcomes
After the module you should be able to:
- Deliver a permeability study a reviewer can follow, from the routes compared on core to net pay, k·h and the saturation-height hand-off.
- Compare permeability routes on the same samples and state the calibration used
- Carry a permeability curve into net pay and k·h with its limits written down
A short preview
On the uncored oil leg of the course well, the five permeability curves land within twofold of the truth for between 18 and 69 percent of samples, as first run. The rock-type curve does best on that count; the SDR curve, once scaled to core by hand, has the smallest error. Calibration moved every route more than the choice between them did. Over the two drill stem test intervals, k·h from the rock-type curve comes out 11 and 12 percent below the test kh, a comparison the analyst sets up by hand.
Who it is for
Petrophysicists, reservoir engineers and geoscientists who build permeability curves from core and logs, define rock types, and carry permeability into net pay, k·h and saturation-height models.
Prerequisites: The Intermediate track, or working experience with shale volume, porosity and water saturation; Advanced modules A2 and A4 help but are not required. The hands-on steps use the Rock Typing, Permeability estimate, NMR and Neural network permeability workspaces in Formation Evaluation, all available from the Starter plan.
Take the module in the Learning Hub
Rock Typing and Permeability: Specialty course, sold separately: eight modules that turn core plugs and logs into a permeability curve you can defend, from plugs on a stated basis through transforms, NMR and rock types to net pay, k·h and the saturation-height hand-off. The lesson opens in the Learning Hub once the track is purchased; graded quizzes and the certificate come with the certified option.