Reservoir characterization of fluvio-deltaic sandstone packages in the framework of depositional environment and diagenesis, the south Caspian Sea basin

Jafarzadeh, Najmeh; Kadkhodaie, Ali; Bahrehvar, Mohammad; Wood, David A.; Janahmad, Behnam

doi:10.1016/j.jseaes.2021.105028

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Overall, in view of the contemporary regional setting of the LAM field deposits, a fluvio-deltaic depositional environment is interpreted, with deposition taking place on a low-gradient, fluvial-dominated delta plain. This is consistent with recent studies in the South Caspian Sea region (Jafarzadeh et al, 2022;Binyatov, 2008;Torres, 2007;Abreu and Nummedal, 2007;Hinds et al, 2004), although the interpretation here is thought to be the first which distinguishes meandering fluvial channels in the north of the basin.…”

Section: Core Description and Depositional Interpretationsupporting

confidence: 93%

Reservoir Characterization of the Pliocene Red Series, Lam Field and Surrounding Areas, Offshore Western Turkmenistan

Rabbani

Al‐Hajri

Hussain

et al. 2022

Journal of Petroleum Geology

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The sedimentology, petrography and reservoir potential of Pliocene sandstones within the Upper Red Series in the offshore LAM field, Western Turkmenistan, have been examined. Depositional settings are interpreted within the framework of the Red Series palaeoenvironments across the entire Turkmen sector of the Apsheron-Prebalkhan uplift zone, including its onshore extension to the east.Examination of 81 m of core from three separate intervals suggests that the Red Series in the LAM field is the product of a fluvial-dominated delta system with associated floodplain deposits, periodically flooded by the saline waters of the South Caspian Lake. Relatively thick sandstones, up to around 5 m thick, are interpreted as channel and pointbar deposits of a meandering river system, with thinner and finer-grained sandstones and siltstones inferred to be crevasse-splay and interdistributary floodplain deposits. Floodplain mudstones display signs of desiccation, soil formation, plant rootlets and occasional thin layers of anhydrite. Intervals with marine trace-fossil assemblages record incursions of saline-lake waters. Conglomeratic layers at the base of thicker mudstone intervals may be associated with abrupt transgressions of the lake. The best reservoir qualities are associated with the fluvial channel and point-bar sandstones. Crevasse-splay and other overbank sandstones are of poorer quality, while intercalated floodplain to lacustrine claystone/siltstone units may constitute local seals.Eighteen sandstone plug samples from the cored intervals were examined in thin-section and by XRD and SEM to assess how mineralogy, grain size and diagenesis affect reservoir quality. The samples consist predominantly of lithic arkoses and feldspathic litharenites; higher porosities, and therefore better reservoir potential, are associated with the feldspathic litharenites. Primary controls on porosity include compaction, clay-matrix content and calcite cementation. XRD data reveal the presence of illite, illite-smectite and chlorite. The presence

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Section: Core Description and Depositional Interpretationsupporting

confidence: 93%

Reservoir Characterization of the Pliocene Red Series, Lam Field and Surrounding Areas, Offshore Western Turkmenistan

Rabbani

Al‐Hajri

Hussain

et al. 2022

Journal of Petroleum Geology

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“…Reservoir characterization of sandstone refers to the amount of porosity and permeability it retained after diagenetic processes and is a function of depositional and diagenetic control [79,80]. Burial diagenesis most likely affects the reservoir quality of sandstone.…”

Section: Reservoir Characterizationmentioning

confidence: 99%

Sedimentological Controls on the Reservoir Characteristics of the Mid-Triassic Tredian Formation in the Salt and Trans-Indus Surghar Ranges, Pakistan: Integration of Outcrop, Petrographic, and SEM Analyses

Qureshi

Arif

Basit³

et al. 2023

JMSE

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The current study uses an integrated lithofacies, optical microscopy, and scanning electron microscopy (SEM) analysis to investigate the sedimentary processes, depositional architecture, and reservoir rock potential of the Tredian Formation’s (Mid-Triassic) mixed siliciclastic and carbonate succession in the Salt and Trans-Indus Ranges. The formation has been divided litho-stratigraphically into two components: the lower Landa Member, which consists of fine-grained sandstone and shale, and the upper Khatkiara Member, which consists of coarse-grained sandstone. Based on sedimentary structures and lithology, four distinct types of lithofacies are identified. Two lithofacies representing sandstones interbedded with shale (LF1) and thick-bedded sandstone (LF2) lithofacies suggestive of fluvio-deltaic settings are among them. Another two lithofacies of thin-bedded sandstone (LF3) and dolomite (LF4) suggest a tidal flat depositional environment, correspondingly. The petrographic examination of the Tredian sandstones indicates a lithology ranging from sub-feldspathic arenite to feldspathic arenite with moderate packing. The presence of primary calcite cement, silica cement, and iron oxide/hydroxide cements were shown by the diagenetic investigation, which was supported by SEM studies. In addition, secondary cements include ferroan-dolomite, chlorite, and illite, which is linked with chemical alteration of unstable grains. The paragenetic sequence depicts the diagenetic evolution of the Tredian sandstone from early to late diagenetic phases. The reservoir quality of the LF1 and LF4 lithofacies has been destroyed by early-stage calcite cementation, but the lithofacies LF2 and LF3 have a strong reservoir potential owing to the scarcity of calcite cement, dissolution of unstable feldspar grains, and grain fracture.

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The Paleocene Hangu formation: A key to unlocking the mysteries of Paleo-Tethys tectonism

Bilal,

Yang,

Lenhardt

et al. 2023

Marine and Petroleum Geology

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Reservoir characterization of fluvio-deltaic sandstone packages in the framework of depositional environment and diagenesis, the south Caspian Sea basin

Cited by 4 publications

References 18 publications

Reservoir Characterization of the Pliocene Red Series, Lam Field and Surrounding Areas, Offshore Western Turkmenistan

Reservoir Characterization of the Pliocene Red Series, Lam Field and Surrounding Areas, Offshore Western Turkmenistan

Sedimentological Controls on the Reservoir Characteristics of the Mid-Triassic Tredian Formation in the Salt and Trans-Indus Surghar Ranges, Pakistan: Integration of Outcrop, Petrographic, and SEM Analyses

The Paleocene Hangu formation: A key to unlocking the mysteries of Paleo-Tethys tectonism

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