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Principal tasks in a subsurface geologic study include storing geologic data and selecting parameters such as depth, production, and total depth for posting on maps. These tasks can be carried out either with index cards, or with a system comprising a microcomputer, an off-the-shelf data-base program, a dot-matrix printer, and simple custom programs. The advantages of the latter approach are numerous, and include: (1) capacity to store thousands of pieces of information on just a few disks, (2) ability to sort and select data according to virtually any criterion (e.g., depth range, formation, etc), (3) capacity to combine selection criteria (e.g., depth of all penetrations of a particular formation in a certain area, that have certain production limits), and (4) removal o the possibility of introducing errors during the posting process. The system is limited either by the quantity and type of data that the geologist wishes to enter into the data base or by the quantity of money available to purchase the data in a form directly readable by the computer.
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