Abstract
The study of the lithoogical columns in 20 oil wells selected from many southern Iraq oil fields proved that these two movements (Second Austrian Alpine and Laramide) affect the diversity, as well as the vertical and lateral sediments distribution in the studied area. Two models were observed for the effect of Episode 2 in the sediments understudy. The first one is direct represented by the lateral and vertical thickness variation. Whereas the second is indirect represented by the changes in sea level and accommodation space, these two factors have great effect on sediments diversity. The intensity of the second Austrian Alpine is greater that of Larimidian movement causing the heterogeneity in the lateral and vertical thickness of Ahmadi, Rumaila and Mishrif formation, and the relative homogeneity in the thickness of Upper Tanuma, Saadi, Hartha, Shiranish, and Tayarat Formations. The sediments of the Second Austrian Movement characterized by their shallowing upward facies except Rumaila Formation which exhibits sub basinal facies due to the relative sea level changes. Furthermore, the Laramidian sediments characterized by deepening upward facies represented by Upper Saadi and Shiranish formations.
Highlights
ABSTRACT The study of the lithoogical columns in 20 oil wells selected from many southern Iraq oil fields proved that these two movements (Second Austrian Alpine and Laramide) affect the diversity, as well as the vertical and lateral sediments distribution in the studied area
The intensity of the second Austrian Alpine is greater that of Larimidian movement causing the heterogeneity in the lateral and vertical thickness of Ahmadi, Rumaila and Mishrif formation, and the relative homogeneity in the thickness of Upper Tanuma, Saadi, Hartha, Shiranish, and Tayarat Formations. The sediments of the Second Austrian Movement characterized by their shallowing upward facies except Rumaila Formation which exhibits sub basinal facies due to the relative sea level changes
Sequencs Stratigraphy and Depositional System of Cenomanian- Early Turonian Formations in Southern Iraq, Unpub
Summary
-Lower part (20m) shally limestone. -Upper part (130.5) limestone. -Lower part (100m) interbedded shally limestone and limestone. -Middle part (20m) chalky limestone. -Upper part (85m) consist of dolomite in the lower (55m) and the upper consist of chalky and detrital limestone. -Lower part (75m) limestone in part shally limestone. -Upper part (108m) chalky limestone. -Lower part (100m) interbedded shally limestone and limestone. -Upper part (24m) interbedded limestone and chalky limestone. -Lower part (35m) interbedded chalky limestone and limestone. -Upper part (78m) limestone and in the middle interbedded between limestone and marly limestone, other between limestone and limestone containers Gypsum. -Lower part (40m) interbedded shale and limestone. -Upper part (63m) in the lower (16m) chalky limestone. -Lower part (35m) interbedded limestone and shaly limestone. -Middle part (74m) consist of marly limestone in the bottom (55m) and shally limestone in the top (19m) , in part chalky limestone. -Lower part (50m) interbedded limestone and shaly limestone and chalky limestone.
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