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  • Igneous rocks

    rocks that were formed by the solidification of molten magma.

    Injection well

    a well used to inject gas or water into the reservoir rock in order to maintain reservoir pressure in secondary recovery or (in the case of gas) for conservation purposes.

    Interruptible gas

    gas made available under agreements permitting the termination or interruption of delivery by the suppliers, usually for a limited number of days in a specific period. The opposite is 'firm' gas.

    Interstitial water

    water present in the pores of the oil- or gas-bearing zone of a reservoir rock. Another name for connate water


    British Institute of Petroleum.

    Isopach map

    a geological map that gives the thickness of a particular stratum.

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