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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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'''Geometrical analysis''' is simply dividing a basin's sedimentary section into three-dimensional bodies of strata using regionally correlative surfaces or features as boundaries. The [[sequence stratigraphy|sequence stratigraphi]]c approach uses unconformities or other genetically significant features to divide the section into [[depositional sequence]]s, [[systems tract]]s, and/or [[parasequence]]s. Recognizing these correlation features is key to identifying depositional sequences properly.

'''Geometrical analysis''' is simply dividing a basin's sedimentary section into three-dimensional bodies of strata using regionally correlative surfaces or features as boundaries. The [[sequence stratigraphy|sequence stratigraphi]]c approach uses unconformities or other genetically significant features to divide the section into [[depositional sequences]], [[Systems_tracts_and_trap_types|systems tracts]], and/or [[parasequence]]s. Recognizing these correlation features is key to identifying depositional sequences properly.

==Procedure==

==Procedure==

==Identifying unconformities==

==Identifying unconformities==

Unconformities are [[third-order cycles|third-order]] sequence boundaries. They are generally regional onlap surfaces. In ''basinal settings'', they are characterized by onlap of allochthonous deposits (i.e., debris flows, slump deposits, turbidites), prograding deltas, carbonate platform deposits, or evaporites. In ''shallow-water or nonmarine settings'', they are characterized by onlap of strata deposited in fluvial, deltaic, or nearshore marine or peritidal environments.<ref name=ch21r48>Weber, L., J., Sarg, J., F., Wright, F., M., 1995, [[Sequence stratigraphy]] and reservoir delineation of the middle Pennsylvanian (Desmoinesian), Paradox basin and Aneth field, southwestern U., S., A., in Read, J., F., Weber, L., J., Sarg, J., F., Wright, F., M., eds., Milankovitch Sea-Level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-House Worlds: SEPM Short Course No. 35, 79 p.</ref> We can identify unconformities using stratigraphic evidence and individual well evidence.

Unconformities are [[Hierarchy of sequences|third-order]] sequence boundaries. They are generally regional onlap surfaces. In ''basinal settings'', they are characterized by onlap of allochthonous deposits (i.e., debris flows, slump deposits, turbidites), prograding deltas, carbonate platform deposits, or evaporites. In ''shallow-water or nonmarine settings'', they are characterized by onlap of strata deposited in fluvial, deltaic, or nearshore marine or peritidal environments.<ref name=ch21r48>Weber, L., J., Sarg, J., F., Wright, F., M., 1995, [[Sequence stratigraphy]] and reservoir delineation of the middle Pennsylvanian (Desmoinesian), Paradox basin and Aneth field, southwestern U., S., A., in Read, J., F., Weber, L., J., Sarg, J., F., Wright, F., M., eds., Milankovitch Sea-Level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-House Worlds: SEPM Short Course No. 35, 79 p.</ref> We can identify unconformities using stratigraphic evidence and individual well evidence.

===Stratigraphic evidence===

===Stratigraphic evidence===