Changes

==Deltaic sediments often form complex reservoirs==

==Deltaic sediments often form complex reservoirs==

Delta systems make heterogeneous reservoirs, typically with a jigsaw-puzzle to labyrinthine sediment geometry (Table 1). There may also be considerable structural complexity. Many rivers, particularly the larger ones, dump very large quantities of sediment into deltas on top of an unstable substrate containing mobile salt and/or shale. Salt deformation features and growth faulting are common in deltaic sediments, and these can result in numerous segmented reservoirs, such as in the Tertiary Niger Delta in west Africa.<ref name=Evamyetal_1978>Evamy, B. D., J. Haremboure, P. Kamerling, W. A. Knaap, F. A. Molloy, and P. H. Rowlands, 1978, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0062/0001/0000/0001.htm Hydrocarbon habitat of Tertiary Niger Delta]: AAPG Bulletin, v. 62, no. 1, p. 1–39.</ref><ref name=Tuttleetal_1999>Tuttle, M. L. W., R. R. Charpentier, and M. E. Brownfield, 1999, [http://greenwood.cr.usgs.gov/energy/WorldEnergy/OF99-50H/ChapterA.html The Niger Delta petroleum system: Niger Delta Province, Nigeria, Cameroon, and Equatorial Guinea, Africa: U.S. Geological Survey Open File Report 99-501], 210 p.</ref>

Delta systems make heterogeneous reservoirs, typically with a jigsaw-puzzle to labyrinthine sediment geometry (Table 1). There may also be considerable structural complexity. Many rivers, particularly the larger ones, dump very large quantities of sediment into deltas on top of an unstable substrate containing mobile salt and/or shale. Salt [[deformation]] features and growth faulting are common in deltaic sediments, and these can result in numerous segmented reservoirs, such as in the Tertiary Niger Delta in west Africa.<ref name=Evamyetal_1978>Evamy, B. D., J. Haremboure, P. Kamerling, W. A. Knaap, F. A. Molloy, and P. H. Rowlands, 1978, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0062/0001/0000/0001.htm Hydrocarbon habitat of Tertiary Niger Delta]: AAPG Bulletin, v. 62, no. 1, p. 1–39.</ref><ref name=Tuttleetal_1999>Tuttle, M. L. W., R. R. Charpentier, and M. E. Brownfield, 1999, [http://greenwood.cr.usgs.gov/energy/WorldEnergy/OF99-50H/ChapterA.html The Niger Delta petroleum system: Niger Delta Province, Nigeria, Cameroon, and Equatorial Guinea, Africa: U.S. Geological Survey Open File Report 99-501], 210 p.</ref>

{| class = "wikitable"

{| class = "wikitable"