WorldWide Drilling Resource

Northern Plains Chapter of the ISEE President: Ron Eastman Tel: 307-680-8805 www.npcisee.org 27 MAY 2014 Frequently-Used Geological Terms Part 30 Glossary Adapted from the Dictionary of Geological Terms I - Continued Infrastructure - Structure produced at a deep crustal level, in a plutonic envi- ronment, under high temperature and pressure. Inherent Ash - Ash from the mineral ele- ments of plant material in coal rather than from accompanying sediments. It cannot be separated mechanically from coal. Initial Production - The volume or amount of gas or oil initially produced by a well over a specific amount of time, typ- ically 24 hours. Injection - Forcing sedimentary mate- rial into a crack or fissure in a preexisting deposit or rock. A sedimentary structure or rock formed this way. Injection Gneiss - A composite rock whose banding is wholly or partly caused by lit-par-lit injection of granitic magma into layered rock. Injection Well - In the water well indus- try, this term refers to a recharge well. In the oil and gas industry, it is a well through which water, gas, steam, or chemicals are pumped into the reservoir formation for pressure maintenance. Also, a well for storage or disposal of injected fluid. Inlier - An area or group of rocks sur- rounded by rocks of a younger age. Inner Core - The central part of the earth’s core extending to the center of the planet. Inorganic - Pertaining or relating to a compound containing no carbon. In Situ - In its natural position. Used when referring to a rock, soil, or fossil located in the situation in which it was originally formed. In Situ Combustion - A method used to recover oil of low gravity and high viscos- ity from a reservoir when primary methods fail. This method involves heating the oil in the formation by igniting it - burning it in place. As the front of burning oil ad- vances, the heat breaks down the oil into coke and light oil is pushed to producing wells. In Situ Theory - The theory that coal orig- inates at the place where the plants grew and decayed. Insoluble Residue - Thematerial remain- ing after the more soluble part of a rock sample has been dissolved in hydrochlo- ric or acetic acid. It is primarily composed of chert or quartz and other fragments of minerals. Interbed - A bed, typically thin, of one kind of rock material occurring between or alternating with beds of another kind. Photo of injection gneiss courtesy of the University of Saskatchewan. More terms to come next month! " ; # 511-,(2 0) 20'5&43 %9 4+(3( ,/( $/5)$&452(23 ; 08 029'0/ # ! : : $8 $,- 3$-(3 *,6(/3,/4(2/$4,0/$- &0. "(% ,4( 777 *,6(/3,/4(2/$4,0/$- &0. WorldWide Drilling Resource ®