Effect of vertical heterogeneities in a petrophysical evaluation of low resistivity pay zones, B sands, upper Eocene, Block III, Lake Maracaibo
Abstract
Thin-bed reservoirs can exist as intercalations of thin porous beds and shales. For a proper petrophysical evaluation and geological characterization of this type of reservoir it is necessary to implement an integrated analysis, which includes knowledge of the depositional environment to avoid missing oil zones by applying standard petrophysical evaluations. The normal resistivity logs used on this area do not have enough vertical resolution for detecting thin low resistivity pay zones. Consequently, the common water saturation models indicate high water saturation when they are evaluated. The Middle Eocene Upper B sands are part of the Misoa Formation in Block III of Lake Maracaibo. They have been exploited since 1965 when the first production test was made. The cumulative oil production to date stands at 11.49 MMSTB. In order to supplement the existing geological information in this area, a continuous core was taken which showed the high degree of shales and thin sands intercalations in the pay zone. A careful core-log calibration was made and a new set of petrophysical parameters were established for this reservoir based on the core measurements. This allowed the establishment of a new petrophysical evaluation procedure that helps the calculation of permeability, hydrocarbon volume in placemore »
- Authors:
-
- Maraven, S.A., Caracas (Venezuela)
- Publication Date:
- OSTI Identifier:
- 421071
- Report Number(s):
- CONF-9609255-
Journal ID: AABUD2; ISSN 0149-1423; TRN: 96:005770-0052
- Resource Type:
- Journal Article
- Journal Name:
- AAPG Bulletin
- Additional Journal Information:
- Journal Volume: 80; Journal Issue: 8; Conference: American Association of Petroleum Geologists (AAPG) international conferences and exhibition, Caracas (Venezuela), 8-11 Sep 1996; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 02 PETROLEUM; VENEZUELA; SEDIMENTARY BASINS; PETROLEUM DEPOSITS; PETROLEUM; EXPLORATION; PRODUCTION; RESERVOIR ROCK; POROSITY; RESISTIVITY LOGGING
Citation Formats
Coll, C, Cortiula, B, Gonzalez, G, Meza, E, and Rondon, L. Effect of vertical heterogeneities in a petrophysical evaluation of low resistivity pay zones, B sands, upper Eocene, Block III, Lake Maracaibo. United States: N. p., 1996.
Web.
Coll, C, Cortiula, B, Gonzalez, G, Meza, E, & Rondon, L. Effect of vertical heterogeneities in a petrophysical evaluation of low resistivity pay zones, B sands, upper Eocene, Block III, Lake Maracaibo. United States.
Coll, C, Cortiula, B, Gonzalez, G, Meza, E, and Rondon, L. 1996.
"Effect of vertical heterogeneities in a petrophysical evaluation of low resistivity pay zones, B sands, upper Eocene, Block III, Lake Maracaibo". United States.
@article{osti_421071,
title = {Effect of vertical heterogeneities in a petrophysical evaluation of low resistivity pay zones, B sands, upper Eocene, Block III, Lake Maracaibo},
author = {Coll, C and Cortiula, B and Gonzalez, G and Meza, E and Rondon, L},
abstractNote = {Thin-bed reservoirs can exist as intercalations of thin porous beds and shales. For a proper petrophysical evaluation and geological characterization of this type of reservoir it is necessary to implement an integrated analysis, which includes knowledge of the depositional environment to avoid missing oil zones by applying standard petrophysical evaluations. The normal resistivity logs used on this area do not have enough vertical resolution for detecting thin low resistivity pay zones. Consequently, the common water saturation models indicate high water saturation when they are evaluated. The Middle Eocene Upper B sands are part of the Misoa Formation in Block III of Lake Maracaibo. They have been exploited since 1965 when the first production test was made. The cumulative oil production to date stands at 11.49 MMSTB. In order to supplement the existing geological information in this area, a continuous core was taken which showed the high degree of shales and thin sands intercalations in the pay zone. A careful core-log calibration was made and a new set of petrophysical parameters were established for this reservoir based on the core measurements. This allowed the establishment of a new petrophysical evaluation procedure that helps the calculation of permeability, hydrocarbon volume in place and productivity of this reservoir.},
doi = {},
url = {https://www.osti.gov/biblio/421071},
journal = {AAPG Bulletin},
number = 8,
volume = 80,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1996},
month = {Thu Aug 01 00:00:00 EDT 1996}
}