Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Evaluation of the Madison Limestone in the Williston Basin from Well Logs and Cores.

Authors
White-EJ; Marchant-LC
Source
NTIS: PB 199 040 :27 pages
Link
NIOSHTIC No.
10008734
Abstract
Data from oil well logs and core analyses were used to quantitatively evaluate formation porosity and water saturation of heterogeneous carbonates and to study the pore geometry and performance characteristics of cores from these formations. Logs and cores from the madison limestone from 233 wells in three fields in the Williston Basin were used in the investigation. A comparison of log and core analyses shows that log porosities are consistently larger than core porosities, and the differences are correlatable with core porosity ranges. Water saturations from logs are usually smaller than the corresponding core saturations by summation of fluids, but the difference is attributable to mud filtrate invasion into the cores during drilling. Petrophysical studies show that the low permeabilities and high residual water saturations in these reservoir rocks are due to their fine crystalline texture and complex pore geometry (heterogeneity). It is concluded that both log and core analyses must be used for reliable evaluation of these carbonate formations. Work done in cooperation with the University of Wyoming.
Publication Date
19710101
Document Type
IH; Report of Investigation;
Fiscal Year
1971
NTIS Accession No.
PB-199040
NTIS Price
A03
Identifying No.
RI 7497
NIOSH Division
LERC;
Source Name
NTIS: PB 199 040
State
WY;
TOP