Changes

[[file:exploring-for-stratigraphic-traps_fig21-37.png|350px|thumb|{{figure number|1}}Diagrammatic cross section showing six potential trap types associated with the lowstand systems tract. From Vail;<ref name=ch21r44 /> courtesy AAPG.]]

[[file:exploring-for-stratigraphic-traps_fig21-37.png|350px|thumb|{{figure number|1}}Diagrammatic cross section showing six potential trap types associated with the lowstand systems tract. From Vail;<ref name=ch21r44 /> courtesy AAPG.]]

During lowstands of sea level, sedimentation rates are high. Therefore, organic source potential is generally low. Where depositional sites are euxinic, source potential is higher. Even so, total organic carbon rarely exceeds 1%.<ref name=ch21r44>Vail, P., R., 1987, [http://archives.datapages.com/data/specpubs/oversiz2/data/a188/a188/0001/0000/0001.htm Seismic stratigraphy interpretation procedure], in Bally, A., W., ed., Atlas of Seismic Stratigraphy: [http://store.aapg.org/detail.aspx?id=478 AAPG Studies in Geology No. 27], p. 2.</ref> Reservoir sands can be thick because they tend to [[Well_log_sequence_analysis#Parasequence_stacking_patterns|aggrade as well as prograde]].

During lowstands of sea level, sedimentation rates are high. Therefore, organic source potential is generally low. Where depositional sites are euxinic, source potential is higher. Even so, total organic carbon rarely exceeds 1%.<ref name=ch21r44>Vail, P. R., 1987, [http://archives.datapages.com/data/specpubs/oversiz2/data/a188/a188/0001/0000/0001.htm Seismic stratigraphy interpretation procedure], in A. W. Bally, ed., Atlas of Seismic Stratigraphy: [http://store.aapg.org/detail.aspx?id=478 AAPG Studies in Geology No. 27], p. 2.</ref> Reservoir sands can be thick because they tend to [[Well_log_sequence_analysis#Parasequence_stacking_patterns|aggrade as well as prograde]].

==Lowstand systems tract traps==

==Lowstand systems tract traps==