Sedimentalogical study for the Upper Shale member in Zubair formation to enhance and comparison oil production in North Rumaila oilfield

Almayyahi, Hayder Kadhim; Al-Jaberi, Mohanad H.

doi:10.1007/s40808-018-0498-x

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…The colors and the barycenters of the model logs in the four optimal electrofacies clusters model are shown in (Figure 7). Four electrofacies were identified in the target interval and classified into four lithofacies based on gamma-ray log response [19]: yellow = sand (clean); light blue = shaley sand; green = sandy shale; dark blue = shale, as shown in (Figures 8 and 9).…”

Section: Cluster Analysismentioning

confidence: 99%

Petrophysical and Statistical Analysis of Main Pay of the Zubair Formation in South Rumaila Oil Field

Al-Samer,

Al-Najm

2024

Iraqi Journal of Science

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The Zubair Formation is one of the major reservoirs of high production in the Rumaila oilfield, southern Iraq. The petrophysical properties analysis of the Upper Sand Member (Main Pay) of the Zubair Formation was conducted. The study includes results analysis of four wells distributed along the South Rumaila oilfield. Using a set of open well-logs, the main pay was divided into three main pay (AB, DJ and LN) units separated by two insulating shale units (C and K). The unit DJ was subdivided into three secondary reservoir units: D, F, H and the LN unit, which is split into L, M, and N. The research also includes the statistical analysis of the petrophysical properties, the calculation of the heterogeneity of the reservoir, and the cluster analysis of the upper sand member. The results indicated that the petrophysical specifications are good. Whereas, the results of the statistical analysis showed that the study wells were heterogeneous reservoirs that could be and were divided into four facies (Sand, Shaly Sand, Sandy Shale and Shale) depending on the log data.

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Section: Cluster Analysismentioning

confidence: 99%

Petrophysical and Statistical Analysis of Main Pay of the Zubair Formation in South Rumaila Oil Field

Al-Samer,

Al-Najm

2024

Iraqi Journal of Science

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“…[5] studied trialing and assessment of shale stabilization for Zubair Shale Formation. [6] investigated the geochemistry of the Zubair Formation (upper shale member) in both northern and southern Rumaila oilfield also compared between the major and trace elements in both fields.…”

Section: Introductionmentioning

confidence: 99%

“….The shales also have a high (L.O.I) loss on ignition, that ranges from 5.53 to 15.53 wt.% (av.= 10.38 wt.%) and is due to the presence of clay minerals and organic matter. Figure(6) depicts the relationship between Al2O3 and major elements. The inverse relationship between SiO2 and Al2O3 is a result of the fact that quartz contains the majority of the silica.…”

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confidence: 99%

Petrography and Geochemistry of Zubair Shale Formation in Rumaila Oilfield, Southern Iraq: Implications for Provenance and Tectonic Setting

Ali

2023

Journal of Petroleum Research and Studies

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A detailed sequential analysis which included thin section petrography, X-ray diffraction, and X-ray fluorescence was applied to investigate the mineral, chemical classifications, provenance, paleo-weathering, paleoclimate, and maturity features of such Zubair oil shale in the Rumaila oilfield in southern Iraq. In core samples and thin sections, the analyzed shales are primarily silty, flaky to subflaky, micaceous, calcareous, well-sorted, poorly cemented, and weakly to moderately compacted silt-grade sandy mudstone. According to XRD analysis, the main mineral is quartz, which is followed by kaolinite, while calcite and dolomite are less common and Illite, Illite/smectite, and pyrite are rarely abundant. Petrographic analysis of the Zubair shales revealed four lithofacies: silty clayey laminated mudstone lithofacies, mica-rich mudstone lithofacies, clay-rich siliceous mudstone lithofacies, and clay-bearing calcareous mudstone lithofacies. Major and trace element concentrations reveal that the oil shales have been formed from felsic rocks such as granodiorite, tonalite, and granite. A passive margin setting was revealed by the tectonic discrimination diagram. Weathering index values like the (CIA) chemical index of alteration, the (PIA) plagioclase index of alteration, and the (CIW) chemical index of weathering imply extensive chemical weathering in the source area. Zubair shales' K2O/Na2O ratio and (ICV) index of compositional variation are uniform with their high maturity. The compositions of mineral and trace elemental ratios, as well as the climatic index "C," indicate a warm to humid subtropical climate with deposition in a shallow oxic and dysoxic environment.

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“…Layers of exposed claystone of Injanah Formation were observed near the valley basin, which passes through mostly agricultural lands in the study area, where the soils containing clay minerals are leached towards the valley during the rainy seasons.In sediments, titanium oxide is associated with (silicon, aluminum, magnesium, and potassium) oxides, which indicate the existence of different phases of clay minerals. Clay minerals increase with the claystone and marl contents of Injanah and Fat'ha formations, so TiO 2 increases by substituting Al 3+ for Ti 4+ due to the ionic radius similarity(Almayyahi & Aljaberi, 2018); in addition, owing to its strong resistance to weathering, TiO 2 is transferred as rutile and ilmenite. TiO 2 is related to trace elements by substitution and adsorption on clay minerals…”

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confidence: 99%

Geochemical study of the sediments in main wadis eastern part of Mosul city, Iraq

Al-Dabbagh

Al-Youzbakey

2023

Preprint

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The geochemical changes in the sediments along streams make it possible to predict the processes on the earth's surface, such as weathering, transport, cation exchange, etc. The sediments can also give an environmental indication and the ability to understand the geological situation more clearly. In addition to the sediments being the main sink of heavy elements, they may be a source of pollution with these elements. The study area is situated on the eastern side of Mosul in northern Iraq. Valleys of (Al-Rashediya, Al-Kharrazi, Al-Khosar Al-Danffilli, and Al-Shor) descend from these high areas towards the Tigris River. The sediments of these valleys consist of various components, such as clay minerals, organic matter, iron oxides, carbonates, etc., and heavy elements that are part of or adsorbed on these components. Thirty-six samples were collected from the sediments of these valleys. They were chemically analyzed using the x-ray fluorescence technique to diagnose the chemical composition of these sediments. Several statistical processes were conducted to determine the distribution of heavy elements in the sediments, including the correlation coefficient and factor analysis, which resulted in four principal components representing 80.86% of the total variance. The first, third, and fourth components represent the influence of the weathering and transport factor on the different parent rocks, while the second component represents the human influence factor. The impact of industrial, civil, and agricultural activities on these valleys was studied using a set of pollution indices such as the geoaccumulation index (Igeo) and the enrichment factor (EF). The highest concentrations were in Al-Danffilli valley, especially in the industrial sector, which means that these sites have high levels of pollution compared to other sites that were polluted at lower rates and sometimes not.

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Sedimentalogical study for the Upper Shale member in Zubair formation to enhance and comparison oil production in North Rumaila oilfield

Cited by 5 publications

References 22 publications

Petrophysical and Statistical Analysis of Main Pay of the Zubair Formation in South Rumaila Oil Field

Petrophysical and Statistical Analysis of Main Pay of the Zubair Formation in South Rumaila Oil Field

Petrography and Geochemistry of Zubair Shale Formation in Rumaila Oilfield, Southern Iraq: Implications for Provenance and Tectonic Setting

Geochemical study of the sediments in main wadis eastern part of Mosul city, Iraq

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