Frank B. Williams, G. Scott Smith, R. E. Brinson, John L. Simpson
Conoco Inc., Ponca City, Oklahoma
ABSTRACT
Capitalizing on Production Research’s pioneering research efforts in computerized analysis of well logs, the CONLOG system was developed by International Exploration and Data Processing Divisions with the aim of making it easier for geologists to obtain better information from electrophysical logs and to aid in routine analysis, display, storage, and recall of data and results.
Programs currently incorporated into the CONLOG system are:
CONLOG - The main program handling most utility operations and analysis operations. Utility operations carry out routine log reading, labeling, storage, listing, and plotting on the Tektronix screen. Analysis operations include determination of porosity, shale volume, water resistivity, and water saturation (six methods) using parameter sets tailored to selected zones. Statistical assessment of porosity feet (or meters) or hydrocarbon feet are other available options. Data entry is via digitizing tablet, tape, or keyboard.
XPLOT - Performs cross-plots of well logs in CONLOG’s workfile.
LINDA - A lithologic analysis program using linear programming techniques on multiple curves.
LOGPL - A formal log-display program which feeds Laser-Gun and Calcomp plotters.
LADJ- Depth adjusts logs to correct for depth errors and distortions.
DSC - A recent addition to handle deviated wells.
These programs are operated in the Control Data Corporation’s Cyber system controlled by the user via keyboard/Tektronix CRT-screen communication. The system prompts the user, and he can get help or respond with *YES, *NO, *PASS, or make selections from a televised menu of
utility or analysis operations. Additional flexibility is gained from *GO , *Q, or *R responses which direct the system to skip steps, quit from the current activity, or reask the preceding question, respectively. Automatic writing of backup files minimizes time loss caused by computer
or transmission line interrupts.