Keywords : Southeast Iraq

Facies Analysis of The Ghar Formation at Selected Wells of South and Southeast Iraq

Ali Al-Jubory - Mohammad AL-Rubaii; Jamal S. Al-Ghrear

Iraqi National Journal of Earth Sciences, 2004, Volume 4, Issue 1, Pages 29-46

Facies analysis of the Ghar Formation at selected wells of south and southeastern Iraq, promote the subdivision of the formation into two main facies. Sandy gravel and carbonates facies that represents terrestrial clastics of arid alluvial fans environment which can also be subdivided into two subfacies; sandy gravel with dolocrete that was deposited in ephemeral braided streams and sand with gravel that represents sheet flood deposits. Other facies is carbonate rich sandstones that represents a transitional environment between fluvial and tidal marine and can be subdivided into several subfacies; fluvial quartzarenite and subarkose, swamp quartzwacke and arkose wacke, tidal carbonate rich sandstones and supratidal carbonate subfacies.

Authigenic Minerals and Diagenesis in The Clastic Sediments of The Ghar Formation South and Southeast Iraq.

Ali I. Al-Juboury Jamal S. Al-GhrearMohammad A. Al-Rubaii

Iraqi National Journal of Earth Sciences, 2003, Volume 3, Issue 1, Pages 1-21

Study of clay minerals (Kaolinite,Iillite and Illite-Smectite mixed layers) in the clastic sediments of the Ghar Formation (Upper Oligocene-Lower Miocene) is the main indicator for the variation of the pore waters responsible for the eodiagenetic processes affecting on
these sediments. Variation of these clay minerals are used also to distinguish the sedimentary environments of the Ghar Formation as transitional environment from fluvial into marine. The genetic relations of these clay minerals and their semi quantitative proportions by XRD and SEM are used also to distinguish the authigenic minerals and their paragenetic sequence.