PfEFFER-java Description (Petrofacies Evaluation of Formations for Engineering Reservoirs)

"PfEFFER Pro is an add-in for Excel. The constant modifications to Excel's functionality has required constant modifications to PfEFFER. Kansas Geological Survey has decided to stop supporting Excel PfEFFER beyond Excel 2007 and to migrate to a PfEFFER Java Freeware version."

The original PfEFFER Pro ¹ was created as an add-in for Excel and released in February 1998. Excel was chosen at the time as a practical method for providing a cost-effective and practical tool for the real-time, interactive log analysis.

PfEFFER-java will replace PfEFFER Pro which is a practical tool for the real-time, interactive log analysis. "Spreadsheet" database and graphic features allow both rapid interaction and comparative evaluation of multiple interpretations or best case/worst case extremes. In addition, multiple zones are easily managed. This Applet is an interactive web application that allows the user to search & load data from the user's PC or from the Kansas Geological Survey (KGS) database & file server.

Note: PfEFFER-java has the appearance of an Excel Workbook. This present model does not allow modification of the raw data in the cells of the "Spreadsheet". Although the "Spreadsheet" data can be saved, this web app will rebuild the "Spreadsheet" from the original raw log data and parameters selected by the user. The PfEFFER sessions will be saved as a Log ASCII Standard (LAS) version 3.0 file. PfEFFER Pro will not be able to recover data from this file.

A PfEFFER-java basic function:

• Reading Log ASCII Standard (LAS) version 2.0 & 3.0
• Saving PfEFFER "Workbook" as Log ASCII Standard (LAS) version 3.0
• Calculation of porosity with option for shale correction and secondary porosity
• Shaly sand models for Sw calculation
• Pay-flag cutoffs
• Constructing a "Super Pickett" crossplot annotated with lines of water saturation, bulk volume water, and permeability
• Log Profile Plot
• LAS Log Curves
• Gamma Ray Colorlith ³ Image Plot Track
• Lithology Rock Column (mineral composition) predicted from Gamma Ray, Bulk Density, Neutron Porosity and Photoelectric Factor Log Curves
• Colorlith ² Plot Track
• PfEFFER Profile Plot
• Reference Log Curves
• PfEFFER Computed Curves
• Gamma Ray Colorlith ³ Plot Track
• Lithology Rock Column predicted from Gamma Ray, Bulk Density, Neutron Porosity and Photoelectric Factor Log Curves

This web application will take advantage of over 11 years of Java development experience at the Kansas Geological Survey (KGS) in developing web applications that plot oil & gas data and allows the geologist to perform analysis with that data, i.e. GEMINI Project & Tools on the KGS Web Site.

GEMINI (Geo-Engineering Modeling through INternet Informatics) Project was developed to allow the geologist to seamlessly integrate databases and geological analytical tools across the web. Analytical tools were designed for the independent oil and gas operators, consultants, and widely separated team members within and outside companies.

The web application is being designed to save the data to the PC using the Log ASCII Standard (LAS) version 3.0 developed by the Canadian Well Logging Society . This version provides a means to collect all the geological data in one file. Although the LAS 3.0 Format has default data types, the user can add their own data types to the file provided they use the primary section types, i.e., Parameter, Definition and Data whenever possible, which are briefly paraphrased below, ⁴

• ~NewSection_Parameter contains a one dimensional data item consisting of (usually but not restricted to) one or two elements. Each line also contains a full description of that data.
• ~NewSection_Definition although structurally identical to a Parameter Data lines (see above), each Column Definition line is used to describe each matching (by order) channel contained in the matching Column Data section. The name, unit, log code, description and format (if used) contained in each Column Definition line fully describe the channel it refers to.
• ~NewSection_Data | NewSection_Definition
Each line contains a series of delimited data values. The delimiting character is defined by the value of the DLM parameter in the ~Version section. Descriptions of each data are contained in the matching Column Definition section.

Reference:
(1) PfEFFER pro http://www.kgs.ku.edu/PRS/software/pfeffer1.html
(2) Color Images of Kansas Subsurface Geology from Well Logs, D. R. Collins and J. H. Doveton, Computer & Geosciences, Vol. 12, No. 4B, pp.519-526 1986
(3) Visualization of Subsurface Geology from Wireline Logs, David R. Collins, Digital Mapping Techniques ‘98-Workshop Proceedings U. S. Geological Survey Open-File Report 98-487
(4) LAS 3.0 Log ASCII Standard Document #1 File Structures by Canadian Well Logging Society: http://www.cwls.org/las_info.php

Author: John R. Victorine jvictor@kgs.ku.edu

The URL for this page is http://www.kgs.ku.edu/software/PfEFFER-java/description.html