Table 1 The distribution of discovered oil and gas fields based on geologic age.
Petroleum reservoirs are broadly classified as oil or gas reservoirs.
The impervious rock covering the reservoir rocks is called a cap rock. Oil and gas fields are geological features that result from the coincident occurrence of four types of geologic features (Figure 1) (1) oil and gas source rocks, (2) reservoir rocks, (3) seals, and (4) traps.
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. Along with other properties of these rocks, it helps to characterize and distinguish them from other types of rocks and it aids in their correlation. .
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The rock structure surrounding the reservoir has to be looked at carefully Synclinally folded rocks dip towards the reservoir, reducing possible leakage but increasing their liability to slip into the reservoir. Limestone; dolomite Organic rocks Form due to. 7 The Gibbs Phase Rule;.
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Classification of Rock Types - a brief introduction -.
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Retrograde gas reservoirs. Petroleum reservoirs may contain any of the three fluid phaseswater (brine), oil, or gas.
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Hydrocarbons accumulated sometime after the formations deposition.
Reservoir rock A permeable subsurface rock unit which contains petroleum.
That is V b V p V g. There are five geological requirements for the formation of a conventional hydrocarbon reservoir Source Rock; Migration Path; Cap Rock; Reservoir Rock; Trap; These geological requirements are illustrated in Figure 2. 03 Classification of Reservoir Rock - Free download as Powerpoint Presentation (.
The rock structure surrounding the reservoir has to be looked at carefully Synclinally folded rocks dip towards the reservoir, reducing possible leakage but increasing their liability to slip into the reservoir. The impervious rock covering the reservoir rocks is called a cap rock. . Metamorphic rocks Both igneous and sedimentary rocks. . Each mineral may have a different wettability, making the wetting character of the composite rock difficult to describe.
The current work is focused on the rock typing and flow unit classification for reservoir characterization in carbonate reservoir, a Yamama Reservoir in south of Iraq (Ratawi Field) has been selected, and the study is depending on the logs and cores data from five wells which penetrate Yamama formation.
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Rock sequence A progression of layered rocks often illustrative of specific stratigraphic characteristics.
Other zones of weakness include fault zones which must be avoided.
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The impervious rock covering the reservoir rocks is called a cap rock.
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