Environmental and sequence stratigraphic implications of anhydrite textures: A case from the Lower Triassic of the Central Persian Gulf

Aleali, Mohsen; Rahimpour‐Bonab, Hossain; Moussavi‐Harami, Reza; Jahani, Davood

doi:10.1016/j.jseaes.2013.07.017

Cited by 52 publications

(21 citation statements)

References 71 publications

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“…Facies analysis and vertical and lateral changes carried out based on [6]- [11]. Sequence Stratigraphy concepts developed by previous workers [2] [12]- [26] were extended to the current study.…”

Section: Methodsmentioning

confidence: 99%

Facies, Sedimentary Environment and Sequence Stratigraphy of Dalan Formation in South Fars, Iran —(Qatar-South Fars Arch) Well ASL-A

Rezavand¹,

Jahani²,

Asilian³

2016

OJG

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Dalan Formation is one of the most important gas reservoirs of south and southwest Iran which it belongs to Dehram Group and its age is Middle to Late Permian. The Dalan formation is interpreted as reflecting a major tectono-eustatic event related to the onset of rapid thermal subsidence of the early Neo-Tethys passive margin in Arabia and Iran, and the drowning of its rift shoulders. The Dalan formation consists mainly of medium to thick-bedded oolitic to micritic shallow-marine carbonate, with intercalations of evaporates. This formation overlies the Faraghan formation and extends up into the Lower Triassic kangan formation. The current paper is focused on the facies, sedimentary environment and sequence Stratigraphy study of the Middle to Upper Permian Dalan formation in the West Assaluyeh gas field the subsurface section of well ASL-A. Based on microfacies analysis and significant founa and flora, nineteen major facies in five facies associations including Tidal flat (A), Lagoon (B), Shoal (C), Open marine (D) and Mid ramp (E) were recognized in the Dalan formation. Facies analysis and those comparisons with modern and ancient environments indicated that the Dalan formation was deposited inner to mid parts of a homoclinal ramp. The sequence stratigraphy studies on the Dalan formation in this gas field led to assessment of seven main sedimentary sequences of the third-order in the Assaluyeh field, well ASL-A. The boundary between the third-order sequences with the Faraghan formation and between the Nar and Upper Dalan members are Subaerial Unconformity (SU) and the boundaries between the third-order sequences with each other and also with the Kangan formation are Correlative Conformity (CC). The main diagenetic processes in this formation are dolomitization, dissolution, anhydritization, cementation and compaction which played a significant role in improving reservoir quality. The shoal ooid grainstone facies with intergranular and oomoldic porosity * Corresponding author. N. Rezavand et al. 945 comprise the main reservoir facies of the Dalan formation.

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Section: Methodsmentioning

confidence: 99%

Facies, Sedimentary Environment and Sequence Stratigraphy of Dalan Formation in South Fars, Iran —(Qatar-South Fars Arch) Well ASL-A

Rezavand¹,

Jahani²,

Asilian³

2016

OJG

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“…Skeletal grains are less than 10% and there are not non-skeletal grains in this facies (Figure 3(a)). An abundance of lime mudstone with fenestral fabrics, bird's eye structure and a lack of skeletal grains indicated that FA 1 is belongs to supratidal to intertidal zone [29]- [31].…”

Section: Fa1) Fenestral Mudstonementioning

confidence: 99%

Microfacies Patterns and Depositional Environments of the Sarvak Formation in the Abadan Plain, Southwest of Zagros, Iran

Asl

Aleali

2016

OJG

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The Sarvak Formation is the second major oil-bearing reservoir in the south and south west of Iran. The Middle Cretaceous Sarvak formation in the Zagros Mountains (Zagros Basin) is mainly composed of carbonate sequences. Based on facies studied, thirteen microfacies were recognized in the studied area, which were categorized in the three facies groups: including inner ramp, mid ramp and outer ramp. Evidences such as the gradual changes in the facies (basin slope), the absence of extensive uninterrupted barrier reef, the lack of calciturbidite and gravity sediments as well as the high proportion of grain-supported indicated that the Sarvak Formation was deposited in the ramp like depositional system, particularly on an inner ramp setting. Inner ramp facies group is the principal setting and subdivided to tidal flat, restricted and unrestricted lagoon as well as shoal sub-environments.

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“…3). The presence of anhydrite and other features related to sabkha deposition (such as chicken-wire anhydrite and nodular/dolomudstones) are interpreted to indicate a dry and warm climate (Insalaco et al, 2006;Alsharhan, 2006;Esrafili-Dizaji and Rahimpour-Bonab, 2009;Rahimpour-Bonab et al, 2010;Aleali et al, 2013).…”

Section: Depositional Environmentmentioning

confidence: 99%

“…South Pars gasfield and its extension within Qatari territorial waters (North field) comprises the world's largest offshore gas accumulation (Halbouty, 2003; studies have focused on depositional and diagenetic characteristics, palaeo-environmental conditions and geochemical properties and on factors governing reservoir quality (e.g. Insalaco et al, 2006;Ehrenberg, 2006;Rahimpour-Bonab, 2007;Ehrenberg et al, 2008;Rahimpour-Bonab et al, 2009Rahimpour-Bonab, 2009, 2013;Tavakoli et al, 2011;Tavakoli and Rahimpour-Bonab, 2012;Aleali et al, 2013). In a recent study (Rahimpour-Bonab et al, 2014), barrier units within the Upper Dalan and Lower Kangan succession (intrareservoir barriers) were evaluated using petrographic, petrophysical (SMLP) and geochemical approaches.…”

Section: Introductionmentioning

confidence: 99%

Flow Unit Characterisation in the Permian‐triassic Carbonate Reservoir Succession at South Pars Gasfield, Offshore Iran

Enayati-Bidgoli

Rahimpour‐Bonab

Mehrabi

2014

Journal of Petroleum Geology

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The South Pars gasfield (offshore southern Iran) has been investigated in detail in recent studies in terms of depositional, diagenetic and reservoir properties of the Permian-Triassic carbonate succession. In the present paper, a variety of flow unit approaches were applied to identify reservoir (flow) and non-reservoir (baffle or barrier) units within the Permian-Triassic carbonates. The zonation scheme was based on three approaches; (i) flow units were identified using the stratigraphic modified Lorenz plot (SMLP) method; (ii) hydraulic flow units were identified using a parameter known as the flow zone indicator (FZI); and (iii) petrophysical flow units (PFUs) were determined using the pore throat radius (R 35 ) and water saturation (S w ) parameters. Studies of flow units at both macro-and micro-scales showed that flow properties were controlled by both depositional and diagenetic features. In order to construct a reservoir flow model, the flow units and PFUs were correlated between the four wells studied within a sequence stratigraphic framework. SMLP-derived flow units appeared to be distributed homogenously within the reservoir succession resulting in a layer-cake architecture. By contrast, the FZI-derived hydraulic flow units drew attention to the presence of small-scale heterogeneities within the reservoir. A comparison between these methods showed that the flow model derived from PFUs included greater vertical and horizontal heterogeneities, especially in the Upper Dalan Member (upper K4 reservoir unit). This was due to depositional/diagenetic heterogeneities in both lateral and vertical directions, and the parameters applied in the PFU method. The PFU-derived flow model showed a closer relationship to the actual reservoir performance than the flow units derived by the other methods and can therefore be used as the basis for future dynamic flow simulation.

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Environmental and sequence stratigraphic implications of anhydrite textures: A case from the Lower Triassic of the Central Persian Gulf

Cited by 52 publications

References 71 publications

Facies, Sedimentary Environment and Sequence Stratigraphy of Dalan Formation in South Fars, Iran —(Qatar-South Fars Arch) Well ASL-A

Facies, Sedimentary Environment and Sequence Stratigraphy of Dalan Formation in South Fars, Iran —(Qatar-South Fars Arch) Well ASL-A

Microfacies Patterns and Depositional Environments of the Sarvak Formation in the Abadan Plain, Southwest of Zagros, Iran

Flow Unit Characterisation in the Permian‐triassic Carbonate Reservoir Succession at South Pars Gasfield, Offshore Iran

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