Changes

==Objective==

==Objective==

The objective of basin-fill analysis is to integrate [[sequence stratigraphy]], geometrical analysis, [[seismic facies analysis]], and lithofacies analysis to produce [[Mapping paleogeography|paleogeographic maps]] of [[Depositional sequence identification|depositional sequence]]s.

The objective of basin-fill analysis is to integrate [[sequence stratigraphy]], geometrical analysis, [[seismic facies analysis]], and [[lithofacies]] analysis to produce [[Mapping paleogeography|paleogeographic maps]] of [[Depositional sequence identification|depositional sequence]]s.

==Procedure==

==Procedure==

[[file:exploring-for-stratigraphic-traps_fig21-33.png|500px|thumb|{{figure number|1}}Chronostratigraphic chart (A) correlated with a chart showing relative sea level changes (B). From Mitchum and Vail;<ref name=ch21r31 /> courtesy AAPG.]]

[[file:exploring-for-stratigraphic-traps_fig21-33.png|500px|thumb|{{figure number|1}}Chronostratigraphic chart (A) correlated with a chart showing relative sea level changes (B). From Mitchum and Vail;<ref name=ch21r31 /> courtesy AAPG.]]

A chronostratigraphic chart is a correlation chart with geologic time as the Y-axis and distance across the area of interest as the X-axis. A [[dip]]-oriented chronostratigraphic chart should be made. But we also should consider making [[strike]]-oriented chronostratigraphic charts, depending on the complexity of the stratigraphic section. A chronostratigraphic chart shows the following:<ref name=ch21r31>Mitchum, R., M., Vail, P., R., Sangree, J., B., 1977, [http://archives.datapages.com/data/specpubs/seismic1/data/a165/a165/0001/0100/0117.htm Seismic stratigraphy and global changes in sea level, part 6: stratigraphic interpretations of seismic reflection patterns in depositional sequences], in Payton, C., E., ed., Seismic Stratigraphy and Applications to Hydrocarbon Exploration: [http://store.aapg.org/detail.aspx?id=1157 AAPG Memoir 26], p. 117–133.</ref>

A chronostratigraphic chart is a correlation chart with geologic time as the Y-axis and distance across the area of interest as the X-axis. A [[dip]]-oriented chronostratigraphic chart should be made. But we also should consider making [[strike]]-oriented chronostratigraphic charts, depending on the complexity of the stratigraphic section. A chronostratigraphic chart shows the following:<ref name=ch21r31>Mitchum, R. M., P. R. Vail, J. B. Sangree, 1977, [http://archives.datapages.com/data/specpubs/seismic1/data/a165/a165/0001/0100/0117.htm Seismic stratigraphy and global changes in sea level, part 6: stratigraphic interpretations of seismic reflection patterns in depositional sequences], in C. E. Payton, ed., Seismic Stratigraphy and Applications to Hydrocarbon Exploration: [http://store.aapg.org/detail.aspx?id=1157 AAPG Memoir 26], p. 117–133.</ref>

* Apparent geologic time of each sequence and time gaps between sequences

* Apparent geologic time of each sequence and time gaps between sequences

* Relationships of [[Depositional sequence|sequences]] to bounding [[Unconformity|unconformities]], highlighting areas of [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=onlap onlap], [http://www.glossary.oilfield.slb.com/en/Terms/d/downlap.aspx downlap], [http://homepage.ufp.pt/biblioteca/Seismic/Pages/Page22.htm toplap], and truncation

* Relationships of [[Depositional sequence|sequences]] to bounding [[Unconformity|unconformities]], highlighting areas of [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=onlap onlap], [http://www.glossary.oilfield.slb.com/en/Terms/d/downlap.aspx downlap], [http://homepage.ufp.pt/biblioteca/Seismic/Pages/Page22.htm toplap], and truncation

* Relationships and correlation of [[Parasequences (fourth- and fifth-order sequences)|parasequences]] to a sequence

* Relationships and correlation of [[Parasequences (fourth- and fifth-order sequences)|parasequences]] to a sequence

* Distribution of [[Lithofacies|facies]]

* Distribution of [[facies]]

Chronostratigraphic charts aid in stratigraphic mapping by showing facies relationships across the basin in terms of time so that [[Paleogeography|paleogeographic]] maps can be made. They are also useful for structural analysis.

Chronostratigraphic charts aid in stratigraphic mapping by showing facies relationships across the basin in terms of time so that [[Paleogeography|paleogeographic]] maps can be made. They are also useful for structural analysis.

[[Category:Exploring for stratigraphic traps]]

[[Category:Exploring for stratigraphic traps]]

[[Category:Basin modeling]]

[[Category:Basin modeling]]