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Lithofacies and environmental analysis of clastic depositional systems (view source)
Revision as of 20:15, 2 March 2014
, 20:15, 2 March 2014→Lacustrine deposits
===Lacustrine deposits===
===Lacustrine deposits===
Lakes occur in a wide variety of geological settings. They are often very important during the early rifting phase of basin formation on continental crust. Major hydrocarbon-bearing lake deposits are associated with very large and long-lived Tertiary lakes such as those of the western United States, Indonesia, and China. These deposits are characterized by siliciclastic, carbonate, and organic-rich sediments deposited under generally low energy conditions, often by suspension deposition. Other processes include turbidity flows in the lake interior and wave and current reworking along the lake margin.
Lakes occur in a wide variety of geological settings. They are often very important during the early [[rift]]ing phase of basin formation on [[continental crust]]. Major hydrocarbon-bearing lake deposits are associated with very large and long-lived [[Tertiary]] lakes such as those of the western United States, Indonesia, and China. These deposits are characterized by siliciclastic, carbonate, and organic-rich sediments deposited under generally low energy conditions, often by suspension deposition. Other processes include [[turbidity flow]]s in the lake interior and wave and current reworking along the lake margin.
Lacustrine rocks are generally the source rocks for hydrocarbons found in alluvial fan, fluvial, eolian, and deltaic rocks rather than the reservoirs. However, sandstone bars, beaches, turbidites, and fan deltas associated with lake margins can be reservoirs sourced by open lake deposits. The core and log response characteristics of these deposits are similar to those described from analogous marine environments.
Lacustrine rocks are generally the source rocks for hydrocarbons found in alluvial fan, fluvial, eolian, and deltaic rocks rather than the reservoirs. However, sandstone bars, beaches, turbidites, and fan deltas associated with lake margins can be reservoirs sourced by open lake deposits. The core and log response characteristics of these deposits are similar to those described from analogous marine environments.