Investigating subsurface structures of Gachsaran oil field in Iran using 2D inversion of magnetotelluric data

Sarvandani, Mohamadhasan Mohamadian; Kalateh, Ali Nejati; Ghaedrahmati, Reza; Majidi, Abbas

doi:10.1071/eg16057

Cited by 7 publications

(4 citation statements)

References 47 publications

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“…The Asmari reservoir thickness is about 500 m in the west and 250 m in the east. It consists mainly of limestone and dolomite with minor siliciclastic intercalations [32]. The stratigraphic chart of Cretaceous-Tertiary sequences in Dezful Embayment illustrating the Oligo-Miocene Asmari Formation is shown in Figure 1.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Gaussian random function simulation (GRFS) algorithm generated a mud loss map for the Asmari Formation (Figure 6). It should be noted that the source of "complete losses" could be either fractures or localized cavities, and they tend to occur in geological formations that have pre-existing fractures [32,34].…”

Section: Mud Loss Mapmentioning

confidence: 99%

“…In the cross-flow system, the PI is unique due to interlayer communication. The system behaves like one, even when partially penetrated [32,34]. Since the field is a fractured reservoir, the PI estimates represent the whole Asmari interval and a combination of layers from Asmari to the Bangestan Group, where appropriate.…”

Section: Productivity Index (Pi) Mapmentioning

confidence: 99%

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A Comprehensive Investigation of the Relationship between Fractures and Oil Production in a Giant Fractured Carbonate Field

Kharrat,

Kadkhodaie,

Azizmohammadi

et al. 2024

Processes

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This study examines the connections between various fracture indicators and production data with an example from one of the giant fields in the Middle East producing complex fractured carbonate lithologies. The field under study hosts two reservoirs with a long development and production history, including carbonates from the Asmari and Bangestan Formations. A fracture intensity map was generated based on the interpretation of image logs from 28 wells drilled within the field. Mud loss data were collected and mapped based on the geostatistical Gaussian Random Function Simulation (GRFS) algorithm. Maximum curvature maps were generated based on Asmari structural surface maps. Comparing the results shows a good agreement between the curvature map, fault distribution model, mud loss map, fracture intensity map, and productivity index. The results of image log interpretations led to the identification of four classes of open fractures, including major open fractures, medium open fractures, minor open fractures, and hairline fractures. Using the azimuth and dip data of the four fracture sets mentioned above, the fracture intensity log was generated as a continuous log for each well with available image log data. For this purpose, the fracture intensity log and a continuous fracture network (CFN) model were generated. The continuous fracture network model was used to generate a 3D discrete fracture network (DFN) for the Asmari Formation. Finally, a 3D upscaled model of fracture dip and azimuth, fracture porosity, fracture permeability, fracture length, fracture aperture, and the sigma parameter (the connectivity index between matrix and fracture) were obtained. The results of this study can illuminate the modeling of intricate reservoirs and the associated production challenges, providing insights not only during the initial production phase but also in the application of advanced oil recovery methods, such as thermal recovery.

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Section: Geological Settingmentioning

confidence: 99%

Section: Mud Loss Mapmentioning

confidence: 99%

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A Comprehensive Investigation of the Relationship between Fractures and Oil Production in a Giant Fractured Carbonate Field

Kharrat,

Kadkhodaie,

Azizmohammadi

et al. 2024

Processes

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“…The MT method is one of various the geophysical methods that can be applied to delineate subsurface structures [13]. Delineation is a geologycal methods to identify the geological structures [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of two-dimensional magnetotelluric inversion for the delineation of the petroleum system in the Kutai basin, East Kalimantan, Indonesia

Muttakhin,

Hamidah,

Hapsoro

et al. 2024

J. Phys.: Conf. Ser.

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The Kutai Basin in East Kalimantan is known as a potential area for oil and gas exploration. Two-dimensional magnetotelluric (MT) analysis is applied to investigate the geological structure and distribution of subsurface resistivity. This study aims to delineate the petroleum system using MT data and identify zones with potential for the accumulation of hydrocarbons. MT data has been collected at several strategic locations in the Kutai Basin, and two-dimensional cross-sections have been constructed to obtain vertical resistivity imaging at several depths. In this study, there were nine measurement points located on one line. The data is then inverted to obtain a two-dimensional resistivity model, which qualitatively represents the subsurface structure. The results of this study indicate that there is a low resistivity anomaly zone that identifies the presence of source rock with a resistivity value of 1-12 Ωm. In this line, it is suspected that the petroleum system that allows trapped hydrocarbons is found in the area, below the KT36 and KT13 measurement points. In this area there are folded structures in the form of synclines and anticlines, which raises suspicions about the types of traps formed from structural traps.

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Electrical resistivity imaging in Shibaozhai area using magnetotelluric sounding: Enlightenment of hydrocarbon reservoirs on the eastern edge of the Sichuan Basin

Wang

Zou

et al. 2022

Appl. Geophys.

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Investigating subsurface structures of Gachsaran oil field in Iran using 2D inversion of magnetotelluric data

Cited by 7 publications

References 47 publications

A Comprehensive Investigation of the Relationship between Fractures and Oil Production in a Giant Fractured Carbonate Field

A Comprehensive Investigation of the Relationship between Fractures and Oil Production in a Giant Fractured Carbonate Field

Analysis of two-dimensional magnetotelluric inversion for the delineation of the petroleum system in the Kutai basin, East Kalimantan, Indonesia

Electrical resistivity imaging in Shibaozhai area using magnetotelluric sounding: Enlightenment of hydrocarbon reservoirs on the eastern edge of the Sichuan Basin

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