Net pay thickness refers to intervals with sufficient porosity and permeability to produce hydrocarbons, excluding non-productive sections, while gross thickness encompasses the entire stratigraphically defined reservoir interval, including non-productive layers. Additionally, net oil-bearing thickness is the portion of the reservoir where oil is present in sufficient saturation to potentially produce oil. The document provides definitions and distinctions between these terms in petroleum engineering.

1. What is the different between net pay and gross thickness?
Net pay (net productive) thickness: It is the thickness of those intervals in which
porosity and permeability are known or supposed to be high enough for the interval
to be able to produce oil or gas, water and gas is not included to the net pay thickness.
Gross thickness: (also referred to reservoir thickness) It is the thickness of the
stratigraphically defined interval in which the reservoir beds occur, including such
non-productive intervals as may be interbedded between the productive intervals. In
other words, it’s the thickness of the whole reservoir.

2. Also
Net oil-bearing thickness: It includes those intervals in which oil is present in such
saturation that the interval may be expected to produce oil, if penetrated by a
properly completed well.
Prepared by Yasir Albeatiy
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