Using borehole images to quantify reservoir quality and stratigraphic distribution
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:6729871
- Schlumberger Geophysics Nusantara, Jakarta (Indonesia)
Understanding the distribution of good-quality reservoir rock in a prospective formation is essential to improved reserves computation and maximized production. High-resolution borehole images provide a rapid and efficient method to evaluate reservoir quality over extended sequences. Microconductivity curves from images are evaluated using modal analysis on histograms to establish specific populations. These populations are assigned to electrofacies, which are discriminated using other logs and core data to generate a lithofacies column. Net pay, or sand counts, are computed based on the distribution of log-derived lithofacies. Reservoir distribution is based on the integration of structural and stratigraphic image analyses. This method is applied to two different reservoirs, the first example is of a well developed, valley-fill sequence comprising thick, stacked fluvial-deltaic channel sands. These sands are over 100 ft thick, have >20% porosity, and over 200 md permeability. The distribution and thickness of optimum quality reservoir is random, however. The second example is of multiple, small scale, depositional units between 3 in. and 24 in., which have 15% porosity with >500 md permeability. The net thickness and exact position of high-quality reservoir intervals is not apparent from standard logs, but becomes clear after image analysis.
- OSTI ID:
- 6729871
- Report Number(s):
- CONF-940803--
- Conference Information:
- Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 78:7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Recognizing high-porosity/low-permeability sandstone reservoirs with routine logs: Case history
RESERVOIR CHARACTERIZATION OF UPPER DEVONIAN GORDON SANDSTONE, JACKSONBURG STRINGTOWN OIL FIELD, NORTHWESTERN WEST VIRGINIA
{open_quotes}2-Step{close_quotes} log analysis of the Spellacy reservoir in the giant Midway-Sunset Field, Kern County, California
Conference
·
Wed Jan 31 23:00:00 EST 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6891805
RESERVOIR CHARACTERIZATION OF UPPER DEVONIAN GORDON SANDSTONE, JACKSONBURG STRINGTOWN OIL FIELD, NORTHWESTERN WEST VIRGINIA
Technical Report
·
Sun Jul 01 00:00:00 EDT 2001
·
OSTI ID:884841
{open_quotes}2-Step{close_quotes} log analysis of the Spellacy reservoir in the giant Midway-Sunset Field, Kern County, California
Conference
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:425887