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Line 98: − − [[file:lithofacies-and-environmental-analysis-of-clastic-depositional-systems_fig2.png|thumb|{{figure number|2}}Gamma ray correlation (dip section) of a series of prograding shoreface sandstones. Note the imbricate nature of the sandstone bodies and the “non-layer cake” nature of the correlations.]]
Lithofacies and environmental analysis of clastic depositional systems (view source)
Revision as of 17:02, 6 June 2014
, 17:02, 6 June 2014→Wireline log calibration and correlation
===Wireline log calibration and correlation===
===Wireline log calibration and correlation===
[[file:lithofacies-and-environmental-analysis-of-clastic-depositional-systems_fig2.png|300px|thumb|{{figure number|2}}Gamma ray correlation (dip section) of a series of prograding shoreface sandstones. Note the imbricate nature of the sandstone bodies and the “non-layer cake” nature of the correlations.]]
Interpretations of depositional environment based on individual well data are transformed into a three-dimensional picture of the reservoir by wireline [[log correlation]] and, where possible, by [[3-D seismic: the data cube|three-dimensional seismic data]].
Interpretations of depositional environment based on individual well data are transformed into a three-dimensional picture of the reservoir by wireline [[log correlation]] and, where possible, by [[3-D seismic: the data cube|three-dimensional seismic data]].
The only sedimentologically significant correlation horizons are those that approximate [[time lines]] within and between sandstone bodies. This style of correlation requires an understanding of the succession of depositional environments and intervening [[Unconformities|unconformable surfaces]]. It often leads to nonparallel and nonhorizontal correlations. For example, in [[Lithofacies and environmental analysis of clastic depositional systems#Shoreline deposits|shoreface]] systems, time lines denoted by shale or silt breaks between shingled shoreface sheets and lenses are inclined in a seaward (depositional [[dip]]) direction ([[:file:lithofacies-and-environmental-analysis-of-clastic-depositional-systems_fig2.png|Figure 2]]).
The only sedimentologically significant correlation horizons are those that approximate [[time lines]] within and between sandstone bodies. This style of correlation requires an understanding of the succession of depositional environments and intervening [[Unconformities|unconformable surfaces]]. It often leads to nonparallel and nonhorizontal correlations. For example, in [[Lithofacies and environmental analysis of clastic depositional systems#Shoreline deposits|shoreface]] systems, time lines denoted by shale or silt breaks between shingled shoreface sheets and lenses are inclined in a seaward (depositional [[dip]]) direction ([[:file:lithofacies-and-environmental-analysis-of-clastic-depositional-systems_fig2.png|Figure 2]]).
This imbrication does not occur in a strike direction. This style of correlation is especially important for reservoir delineation since the large scale (interwell and field) architecture of the sandstone body exerts a control on the movement of fluids through the volume of the reservoir.
This imbrication does not occur in a strike direction. This style of correlation is especially important for reservoir delineation since the large scale (interwell and field) architecture of the sandstone body exerts a control on the movement of fluids through the volume of the reservoir.