Wireline log modeling of geologic data: application to automated lithology identification

Conference · Thu May 01 04:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:5161910

King, D E; Quirein, J A

A method has been developed to quantitatively translate geologic data into modeled wireline log data. The modeled log data have been used to construct a data base for a computer program that performs automatic lithology identification. This technique provides accuracy previously unattainable using empirically constructed data bases. Electrofacies - n-dimensional ellipsoids defined by the n log measurements of each rock model - are constructed from the synthetic data and entered in the data base. The electrofacies are defined by minimum and maximum log values for the eight possible log measurements (density, neutron porosity, gamma ray, sonic transit time, photoelectric cross section, potassium, thorium, and uranium) and correlation coefficients for each possible pair of logs. A data base containing approximately 130 electrofacies has been constructed for the Permian basin region of west Texas and has been tested on a variety of lithologies. Comparison of results using the modeled data base and sidewall core analyses demonstrates the accuracy of the data base for automatic lithology identification.

• Research Organization: Schlumberger, Well Services, Houston, TX
• OSTI ID: 5161910
• Report Number(s): CONF-860624-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ACTINIDES
ALKALI METALS
DATA ANALYSIS
ELEMENTS
FEDERAL REGION VI
GAMMA LOGGING
GRAVITY LOGGING
LITHOLOGY
MATHEMATICAL MODELS
METALS
NORTH AMERICA
PERMIAN BASIN
POTASSIUM
RADIOACTIVITY LOGGING
TEXAS
THORIUM
URANIUM
USA
WELL LOGGING