Siliciclastic deposit of the Nahr Umr Formation, sedimentological and depositional environment studies, central and southern Iraq

Al-Dabbas, Moutaz A.; Al-Jassim, Jassim A.; Qaradaghi, Amanj I.

doi:10.1007/s12517-012-0747-7

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…The Mishrif Formation (Cenomanian-Early Turonian age) is the main carbonate reservoirs in middle, southern Iraq and throughout the Middle East (Aqrawi et al, 1998) (Alsharhan, 1991;1994, Al-Dabbas et al, 2012. Within the Mesopotamian Basin, the Nahr Umr Formation gradationally underlies the Mauddud Formation and un-conformably overlies the Shuaiba Formation.…”

Section: Geological Backgroundmentioning

confidence: 99%

Well Logs Data Prediction of the Nahr Umr and Mishrif Formations in the Well Noor-10, Southern Iraq

Mohammed¹

2020

IGJ

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Well logs data are the most widely used data to evaluate subsurface rocks, their petrophysical properties include porosity, permeability and fluid saturation. They are essential for the hydrocarbon reserves estimations and perforation zones determination for production purposes and fields development. Well logging operations of the targeted reservoirs could not be done in NO-10 Well, Noor Oilfield, Southern Iraq due to some problems related to the well condition. The gamma-ray and sonic logs were the only recorded logs, while neutron, density and deep resistivity logs are missed. The missing neutron, density and deep resistivity logs of the Early Cretaceous Nahr Umr Sandstone and the Late Cretaceous Mishrif formations of the well NO-10 were produced and compared together using the Artificial Neural Network ANN in Petrel software. The results show that the total correlation of the ANN Nahr Umr model for the neutron, density and deep resistivity logs are 0.81, 0.49 and 0.51 respectively. Interestingly, the ANN Mishrif Formation model recorded 0.88, 0.92 and 0.81 for neutron, density and resistivity logs respectively. The results show excellent relationships between the original and the predicted logs in the Mishrif model, unlike the Nahr Umr model expect in ANN of the neutron log. It was expected that the total relationships are low in Nahr Umr due to the lithology variation that includes interbedded consolidated and unconsolidated sandstone interbedded with the shale. It is also observed that the gamma log shows low values and the caliper logs is smoothed in the Mishrif. In contrast, the Nahr Umr sandstone logs show that many washouts have occurred. Therefore, logs' responses highly possible to be affected in the Nahr Umr Formation which leads to a decreasing in the coefficient of determinations.

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Section: Geological Backgroundmentioning

confidence: 99%

Well Logs Data Prediction of the Nahr Umr and Mishrif Formations in the Well Noor-10, Southern Iraq

Mohammed¹

2020

IGJ

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“…Many variables influence the mineral composition of sandstone, including the mineral composition of the source rock, the distance of carrying debris before it reaches the final deposition sites, the climate in the source area and the diagenetic effect once the deposition is complete [3]. The sandstones of the Nahr Umr Formation are classified as quartz arenite [2]. Which formed after long-distance transport from the source area.…”

Section: Petrographymentioning

confidence: 99%

Stratigraphy Analysis of the Nahr Umr Formation in Zubair oil field, Southern Iraq

Mohammed

Alsultan

2023

Iraqi Journal of Science

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The Nahr Umr Formation is considered one of the main reservoirs produced in southern Iraq. It is one of the important siliciclastic deposits of the Cretaceous sequence of Iraq oilfields. Zubair oil fields ZB-190 and ZB-047 were chosen to study areas. This study depends on the available core and cutting samples to determine the facies analysis, depositional environments, petrographic characteristics and diagenesis processes. Based on the description of the core and the borehole, six types of facies were distinguished in the Nahr Umr Formation, resulting in an intercalated sandstone and shale with a thin layer of siltstone. The petrographic study of the clastic part of the Nahr Umr Formation showed that the sandstone is composed mainly of quartz arenite. Diagenesis processes affecting the Nahr Umr Formation are two types compaction and cementation processes. The sedimentary environment of the Nahr Umr Formation was represented by the deltaic fluvial environments. These environments appear in the central and southwestern parts of the study area. Sequence stratigraphy in the Nahr Umr Formation is beginning by sequence boundary type one (SB1) and sequence boundary type two (SB2) that appeared in the upper part of the formation. The other surfaces were represented by the end of the deposition of the Nahr Umr Formation and the emergence of the transgressive ravinement surface (TRS) within the transgressive system tract (TST)and The maximum flooding surface (MFS) was distinguished in the middle of the formation and each of these surfaces has a lateral extension along the study section.

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“…The Cretaceous rocks represent good oil potential rocks within the stratigraphic column in southern Iraq. The main oil reservoirs are of the Cretaceous age, in addition to some important reservoirs from the Tertiary and upper Jurassic ages at most of the hydrocarbon within this point of view were confined to Suitable deposits for reserve especially in the lower and middle Cretaceous Formations in the south of Iraq [1,2,3]. This study targets Yamama Formation due to its good oil potential which attracted the interest of many researchers [4].…”

Section: Introductionmentioning

confidence: 99%

Depositional Environment and Microfacies Analysis of Yamama Formation in North Rumaila Oil Field, South Iraq

Mohammed

Nasser

2022

eijs

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Yamama Formation is an important sequence in southern Iraq. Petrographic analysis was used to determine and analyze the microfacies and pore types. The diagenetic processes and the impacts on the petrophysical properties of the rocks were also identified. The petrographic identification was based on data of 250 thin sections of cutting and core samples from four wells that were supplied by the Iraqi Oil Exploration Company (O.E.C). The present study focuses on the depositional environment and the microfacies analysis of Yamama Formation. The results revealed several types of microfacies, including peloidal wackestone-packstone, algal wackestone-packstone, bioclastic wackestone-packstone, foraminiferal wackestone, bioclastic wackestone, and mudstone. The latter was divided into two submicrofacies, namely argillaceous lime mudstone and sparse fossiliferous lime mudstone. The study showed that Yamama Formation was deposited through various settings within the carbonate platform; these comprise inner ramp, middle ramp, and outer ramp settings. The inner and middle ramp settings, characterized at the top and middle Formation, have high effective porosity and low clay volume, due to dominant packstone.

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Siliciclastic deposit of the Nahr Umr Formation, sedimentological and depositional environment studies, central and southern Iraq

Cited by 9 publications

References 7 publications

Well Logs Data Prediction of the Nahr Umr and Mishrif Formations in the Well Noor-10, Southern Iraq

Well Logs Data Prediction of the Nahr Umr and Mishrif Formations in the Well Noor-10, Southern Iraq

Stratigraphy Analysis of the Nahr Umr Formation in Zubair oil field, Southern Iraq

Depositional Environment and Microfacies Analysis of Yamama Formation in North Rumaila Oil Field, South Iraq

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