Mapping and Classifying Flow Units in the Upper Part of the Mid‐cretaceous Sarvak Formation (Western Dezful Embayment, Sw Iran) Based on a Detemination of Reservoir Rock Types

Beiranvand, Bijan; Ahmadi, Abbas; Sharafodin, M.

doi:10.1111/j.1747-5457.2007.00357.x

Cited by 22 publications

(13 citation statements)

References 25 publications

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“…The Upper Sarvak Formation is capped by the regional-scale Turonian unconformity which has been reported in southern Iran and elsewhere in the region (James and Wynd, 1965;Setudehnia, 1978;Harris et al, 1984;Beiranvand et al, 2007;Taghavi et al, 2006;Hajikazemi et al, 2010;Sharp et al, 2010;Razin et al, 2010). The associated palaeo-exposure surface, which is recognized by brecciation, karstification and lateritization, appears to be responsible for the creation and enhancement of favourable reservoir characteristics.…”

Section: Introductionmentioning

confidence: 88%

“…Pattison and Takin, 1971;Setudehnia, 1978). However more recent investigations have indicated the occurrence of at least two unconformities within the succession (Taghavi et al, 2006;Beiranvand et al, 2007;Hajikazemi et al, 2010, Sharp et al, 2010. Furthermore, based on palaeontological data (Ghabeishavi et al, 2010), the apparent depositional continuity of the succession has been questioned, suggesting the presence of a break in sedimentation prior to mid-Cenomanian time.…”

Section: Introductionmentioning

confidence: 99%

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Chemostratigraphy of Cenomanian–turonian Carbonates of the Sarvak Formation, Southern Iran

Hajikazemi

Al‐Aasm

Coniglio

2012

Journal of Petroleum Geology

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Stable‐isotope and trace‐element analyses from five surface and subsurface sections of the mid‐Cretaceous Sarvak Formation in southern and offshore Iran confirm the presence of the regional‐scale Turonian unconformity and of a more local Cenomanian–Turonian unconformity. The geochemical results indicate the presence of previously unrecognized and/or undifferentiated subaerial exposure surfaces. Sarvak Formation carbonates at or near palaeo‐exposure surfaces show varying degrees of diagenetic modification, and more extensive alteration is associated with longer periods of exposure. The subaerial exposure and associated diagenetic processes greatly influenced reservoir quality and amplified karstification and evolution of porosity in the Upper Sarvak Formation. The palaeo‐exposure surfaces are identified by their negative δ13C values (as low as – 6.4%) and negative δ18O values (as low as –9.4%), together with low Sr concentrations and relatively high 87Sr/86Sr ratios. These geochemical characteristics are interpreted to be the result of the interaction of the Sarvak Formation carbonates with meteoric waters charged with atmospheric CO2. The meteoric waters also caused karstification and soil formation which in some places extends a few metres below the exposure surfaces. Depleted carbon values were not recorded in areas where palaeosols are not well developed or where the uppermost layers of the Sarvak Formation have been removed by erosion.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Chemostratigraphy of Cenomanian–turonian Carbonates of the Sarvak Formation, Southern Iran

Hajikazemi

Al‐Aasm

Coniglio

2012

Journal of Petroleum Geology

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“…According to those workers the diagenetic processes, especially the regressive parts of each major sequence, were controlled by sea-level fluctuations. Beiranvand et al (2007) different reservoir rock types with significant vertical and lateral heterogeneities in a giant oilfield near the northern head of the Persian Gulf. Farzadi & Hesthmer (2007) integrated the 3D geophysical and well-log data from the Sirri oilfields and introduced the volume-based interpretation technique as a suitable method for detailed stratigraphic interpretation of the Turonian palaeokarst in the Sarvak carbonates.…”

Section: Previous Study Of the Sarvak Formationmentioning

confidence: 99%

“…In addition, there is evidence for the presence of a local erosional unconformity at the Cenomanian -Turonian boundary, observed in drilled wells and outcrops of the Sarvak Formation examined in southwestern Iran (e.g. Beiranvand et al 2007).…”

Section: Regional Geological Settingmentioning

confidence: 99%

Subaerial exposure and meteoric diagenesis of the Cenomanian-Turonian Upper Sarvak Formation, southwestern Iran

Hajikazemi

Al‐Aasm

Coniglio

2010

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The Sarvak Formation (Cenomanian -Turonian) forms one of the main reservoir rocks in many oilfields in southern Iran. Extensive lateral and vertical facies variations as well as effects caused mainly by the subaerial exposure associated with the regional Turonian unconformity have resulted in variable porosity and permeability. Dissolution affected the entire upper part of the Sarvak Formation and is the most important process related to subaerial exposure. Brecciation, development of palaeosol and formation of bauxite deposits are also limited to the upper few metres of the top of the Sarvak Formation and indicate warm and humid climatic conditions. Subaerial exposure had varying effects on the diagenesis depending on its duration, palaeotopography and the availability of meteoric water. The d 18 O and d 13 C values obtained from calcitic matrix, various generations of calcite cements and calcitic rudist shells in the Upper Sarvak overlap to a large extent, indicating their equilibration with fluids of similar isotopic composition. Negative d 18 O values (i.e. 26.6‰ to 21.7‰) suggest a significant meteoric component. More 18 O-depleted values (e.g. 212.3‰) obtained from late calcite cements indicate their precipitatation from warm fluids. Positive d 13 C values (i.e. 0.00‰ to 3.4‰) in the various carbonate phases reflect values of seawater coeval with an Oceanic Anoxic Event and later modified by meteoric waters.

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“…Identifying reservoir rock types and their vertical and horizontal heterogeneities is important in reservoir characterization and the construction of threedimensional geological and flow simulation models (e.g. Beiranvand et al, 2007). Two frequently used methods were applied in this study, and there is close correspondence between the respective results.…”

Section: Discussionmentioning

confidence: 97%

FLOW UNIT DISTRIBUTION AND RESERVOIR MODELLING IN CRETACEOUS CARBONATES OF THE SARVAK FORMATION, ABTEYMOUR OILFIELD, DEZFUL EMBAYMENT, SW IRAN

Rahimpour‐Bonab

Mehrabi

Navidtalab

et al. 2012

Journal of Petroleum Geology

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Carbonate sediments within the Mid-Cretaceous Sarvak Formation form an important reservoir at the Abteymour oilfield in the western Dezful Embayment, SW Iran. The poroperm characteristics of this reservoir were controlled by factors including deposition under tropical climatic conditions and early diagenesis, repeated phases of subaerial exposure due to local, regional and global-scale tectonism, and diagenetic modification during burial. From microfacies analysis, the Sarvak Formation carbonates in the Abteymour field were interpreted in a previous study as having been deposited on a homoclinal ramp-type platform. Three third-order sequences were recognized in the middle Cenomanian to middle Turonian part of the formation. The reservoir quality of the carbonates was enhanced both by dissolution (comprising separate phases of eogenetic and telogenetic meteoric dissolution) and dolomitization (especially styloliterelated dolomitization).In this paper, a rock/pore type approach was used in order to integrate petrophysical data with facies and diagenetic models within a sequence stratigraphic framework. Two different rock-typing methods for the determination of flow units were considered. Hydraulic flow units (HFUs) were identified firstly using flow zone indicators and secondly using a stratigraphic modified Lorenz plot. The flow units resulting from these two methods are compared, and their close correspondence within the sequence stratigraphic framework is discussed. In addition, the previously-used large-scale reservoir zonation scheme for the Abteymour field is correlated with the defined flow units, and four new Integrated Reservoir Zones are introduced. By integrating geological information with petrophysical parameters (including porosity, permeability and saturation) within a sequence stratigraphic framework, field-scale variations and controls on reservoir quality are described.

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Mapping and Classifying Flow Units in the Upper Part of the Mid‐cretaceous Sarvak Formation (Western Dezful Embayment, Sw Iran) Based on a Detemination of Reservoir Rock Types

Cited by 22 publications

References 25 publications

Chemostratigraphy of Cenomanian–turonian Carbonates of the Sarvak Formation, Southern Iran

Chemostratigraphy of Cenomanian–turonian Carbonates of the Sarvak Formation, Southern Iran

Subaerial exposure and meteoric diagenesis of the Cenomanian-Turonian Upper Sarvak Formation, southwestern Iran

FLOW UNIT DISTRIBUTION AND RESERVOIR MODELLING IN CRETACEOUS CARBONATES OF THE SARVAK FORMATION, ABTEYMOUR OILFIELD, DEZFUL EMBAYMENT, SW IRAN

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