Porosity evolution in sequence stratigraphic framework: a case from Cretaceous carbonate reservoir in the Persian Gulf, southern Iran

Mehrabi, Hamzeh; Bahrehvar, Mohammad; Rahimpour‐Bonab, Hossain

doi:10.1016/j.petrol.2020.107699

Cited by 16 publications

(2 citation statements)

References 24 publications

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“…The pore system and its associated heterogeneities play a pivotal role in fluid flow, porosity-permeability values, water saturation, relative permeability, and capillary pressure in carbonate reservoirs [6][7][8][9]. Recognizing and interpreting variations in the pore system, along with its classification from a petrophysical standpoint, contribute to a better comprehension of reservoir heterogeneities [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Pore-Type Characterization and Reservoir Zonation of the Sarvak Formation in the Abadan Plain, Zagros Basin, Iran

Mehrabi,

Karami,

Fakhar-Shahreza

et al. 2023

Minerals

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Carbonate reservoirs are characterized by their complex depositional–diagenetic history and, consequently, intricate pore networks. In this study, pore types and reservoir zones of the Sarvak Formation, which is the second most important oil reservoir in Iran, are investigated by integrating core, thin-section, porosity–permeability, scanning electron microscopy (SEM), and mercury injection capillary pressure (MICP) data. Depositional, diagenetic, and fracture pores are identified in macroscopic to microscopic scales. Frequency analysis of pore types revealed that diagenetic pores, including vuggy, moldic, intercrystalline, and fracture pores, formed the majority of pore spaces of the Sarvak Formation. They are dominantly recorded in the regressive systems tracts of both the Cenomanian and Turonian sequences, just below the paleoexposure surfaces. Away from the disconformities, there are two general trends regarding the pore-types distribution: (a) grain-supported facies of shoal and talus settings with dominant primary (depositional) pores including interparticle, intra-skeletal, and growth-framework pores, which are concentrated in the middle part of the formation, and (b) microporous mud-dominated facies with various types of primary and secondary pore types in the TSTs of third-order sequences, especially in the lower part of the Sarvak Formation. Stratigraphic modified Lorenz plot differentiated reservoir, speed, barrier, and baffle zones in this formation. Depositional–diagenetic characters, petrophysical properties, and dominant pore types are defined for each zone in a sequence stratigraphic framework.

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Section: Introductionmentioning

confidence: 99%

Pore-Type Characterization and Reservoir Zonation of the Sarvak Formation in the Abadan Plain, Zagros Basin, Iran

Mehrabi,

Karami,

Fakhar-Shahreza

et al. 2023

Minerals

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“…Several studies have shown that diagenesis and volcanic activity play important roles in the large-scale distribution of reservoirs. ,− Diagenesis directly controls the characteristics of the pore structure and then affects reservoir physical properties. − In tight sandstone, after strong compaction, pore size is mainly distributed in the range of several nanometers to tens of microns; narrower pore throats result in more complex pore shapes and worse connectivity, and thus, the comprehensive characterization of pore structure is more difficult, − and the reservoir physical properties related to the pore structure are more difficult to predict. Although dissolution can obviously improve reservoir porosity, the connectivity of secondary dissolution pores is lower than that of primary pores. ,,, …”

Section: Introductionmentioning

confidence: 99%

Pore Structure Characteristics and Controlling Factors of a Tight Sandstone Reservoir in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China

Yang

Zhang

et al. 2022

ACS Omega

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Tight sandstone reservoirs have ultralow physical properties and strong heterogeneity, and there is a need to describe the corresponding pore structure characteristics systematically to promote research on unconventional reservoirs. The pore structure, controlled by the diagenesis and volcanic activity of the tight reservoirs in the third member of the Shahejie Formation (Es3) of the Gaoshangpu structural belt in the Nanpu Sag, is studied by high-pressure mercury injection, nuclear magnetic resonance, and constant-rate-controlled mercury porosimetry. The results show that the Es3 reservoir can be divided into three types: the pore radii of Type I reservoirs range from 120 to 180 μm, and the throat radii are larger than 1 μm, resulting in good pore connectivity; pore radii of Type II reservoirs are approximately 100 μm, and the throat radii range from 0.1 to 1 μm, resulting in moderate pore connectivity; and pore radii of Type III reservoirs are much smaller than 100 μm, and the throat radii are smaller than 0.1 μm, resulting in worst pore connectivity. The pore size of Type I reservoirs is most sensitive to compaction, and the pore connectivity is mainly controlled by carbonate cementation; the pore throat size and pore connectivity of Type II reservoirs are seriously affected by clay cementation, and pores are mainly formed by dissolution. However, the pore structure of Type III reservoirs is the worst among those investigated in this study but can be further improved by dissolution to a certain extent. Volcanic activity controls cementation and affects dissolution, thus changing the pore structure. A pore structure evolution model is established, which can provide a reference for future oil gas exploration.

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Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

Chen

Niu

et al. 2022

Geological Journal

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A set of marine carbonates was deposited in the Palaeozoic of the North China Craton, which is the dominant sequence for buried hill hydrocarbon exploration. This study focuses on the lithofacies and reservoirs developed in the sequence. Based on the data of cores, thin sections, drilling, and logging, the characteristics of the sequence stratigraphic framework and its control on lithofacies and reservoirs of the Lower Palaeozoic buried hills in the offshore Bohai Bay Basin are discussed.The results show that there developed 4 second-order sequences and 21 third-order sequences in the study area. Due to the deep burial depth, the dolomite is more likely to form high-quality reservoirs than limestone in the study area, and we define the dolomitic tidal flat-dominant sequences as 'favorable reservoir sequences'. There developed unconformity-related reservoirs and inner reservoirs in the buried hill, and the 'favourable reservoir sequences' present obvious control on both reservoirs, showing: (i) 'favourable reservoir sequences' and weathering interface control on the scale of the unconformity-related reservoir jointly, and (ii) the inner reservoirs developed within 'favourable reservoir sequences' as well, and the top and bottom of the high-frequency sequences are the predominant areas for the bedding karst reservoir distribution.

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Porosity evolution in sequence stratigraphic framework: a case from Cretaceous carbonate reservoir in the Persian Gulf, southern Iran

Cited by 16 publications

References 24 publications

Pore-Type Characterization and Reservoir Zonation of the Sarvak Formation in the Abadan Plain, Zagros Basin, Iran

Pore-Type Characterization and Reservoir Zonation of the Sarvak Formation in the Abadan Plain, Zagros Basin, Iran

Pore Structure Characteristics and Controlling Factors of a Tight Sandstone Reservoir in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin, China

Lithofacies and reservoirs in sequence stratigraphic framework of Lower Palaeozoic carbonate, offshore Bohai Bay Basin, eastern China

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