key horizon

key horizon

[′kē hə‚rīz·ən]
(geology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The mollic (= melanic) horizon is the key horizon in Chernozems.
Integration of seismic and well data to enhance the precision of the interpretation process in order to identify the depth of key horizons and to construct the 3D model of the key horizons including the reservoir rocks.