A series of microcomputer programs have been written to aid the geologist in building a well-data file, selectively retrieving data from the file, and generating posted maps on a printer. The system uses an IBM PC with 64K of memory, one disk drive, and an Epson MX 100 printer. The programs are written in BASICA to run under DOS 1.1. The system has been used to conduct regional geologic studies in the Michigan basin and to make field studies.

The data files contain well-identification information such as well names, location, API number, completion date, elevation, and total

End_Page 450------------------------------

depth. Up to 34-depth-related markers can be defined for each project-oriented file. In addition, an x-y location is assigned for each well by reading the coordinates from a graph-paper overlay to the user's base map.

One program is used to build and maintain the file with a screen menu of available operations. A screen data form is used to enter and correct the items. Tables of contents of the wells in the file sorted in several different sequences can be listed on the monitor or the printer.

A program to selectively retrieve up to 8 data items per run through the file generates a tabular listing of the wanted items together with the well-identification information. The data items retrieved can be the stored value, the stored value less minus elevation, and the difference between 2 stored values. The retrieved data can be sorted in the same ways as the tables of contents.

The last program creates a printer-posted map of the stored values, or subsea depths, or isopach interval values. Values are normally posted to the right of an asterisk well symbol unless 2 values print in the same position, and then the second value is posted to the left. In places where 3 or more values overprint, the first 2 are posted and the well symbol is changed to a plus sign.

The programs are flexible and easy to run via screen menus. Additions and corrections to the data base are accomplished very quickly.

End_of_Article - Last_Page 451------------