Fracture characterization of Asmari Formation carbonate reservoirs in G Oilfield, Zagros Basin, Middle East

Tong, Kaijun; He, Juan; Dong, Shaoqun; Sun, Futing; Chen, Peiyuan; Tang, Yi

doi:10.1016/j.engeos.2023.100178

Cited by 10 publications

(1 citation statement)

References 27 publications

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“…In addition to chlorite, the types of clay minerals in the study area also include illite and illite/montmorillonite mixed layers. Among them, illite is mainly found in filamentous form in intergranular pores and dissolution intergranular pores [46,48,49]. With the increase in clay mineral content, a large amount of non-chlorite fills the pores, causing a decrease in reservoir properties.…”

Section: Effect Of Mineral Components On Microscopic Pore-throat Stru...mentioning

confidence: 99%

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Xiao,

Wang,

Ning

et al. 2024

Minerals

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In order to better understand pore–throat structure characteristics, the coupling relationship between micropore–throat structure and macro reservoir quality and influencing factors caused by authigenic minerals were studied. Petrographic analyses, scanning electron microscopy (SEM), pressure-controlled mercury injection (PMI), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD) were performed on a suite of tight reservoir samples from the Chang 8 Member of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin, China. The results show that the pore–throat sizes obtained with the combination of PMI and NMR methods varied from nano- to microscale, revealing pore–throat sizes ranging from 0.001 μm to 70 μm, and showing that pore–throats with a radius larger than 1.0 μm are rare. Larger pore–throats with good connectivity (>rapex) account for a smaller part of the total pore volume, ranging from approximately 7.58% to 38.90% with an average of 22.77%, but account for more than 80% of contributions to permeability. The effective movable fluid porosity (φemp) measured by NMR, ranging from approximately 0.10% to 7.07% with an average of 2.56%, had a positive contribution to permeability. The contents of chlorite occurrence state, other than illite, are beneficial to pore–throat preservation. A new reservoir evaluation scheme of the Chang 8 reservoir is established. These research results provide a theoretical basis for the evaluation and development of tight sandstone oil and gas exploration.

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Section: Effect Of Mineral Components On Microscopic Pore-throat Stru...mentioning

confidence: 99%

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Xiao,

Wang,

Ning

et al. 2024

Minerals

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Development Characteristics of Fractures in the Upper Palaeozoic Along the Northeastern Edge of the Ordos Basin and Their Controlling Effects on Hydrocarbon Accumulation

Yin,

Xu,

et al. 2024

Geological Journal

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The northeastern edge of the Ordos Basin is characterised by low‐amplitude structures and the presence of intrusive rock bodies in the Upper Palaeozoic strata. Tectonic movements and stratal denudation during the Mesozoic and Cenozoic have resulted in the development of well‐defined and effective fractures in the area. However, the controlling role of fractures on the Upper Palaeozoic gas reservoirs is not yet clear. This paper uses the Linxing Block as a case study to conduct a comprehensive analysis of the role of fractures in controlling gas distribution. The study shows that the Upper Palaeozoic in this area is primarily characterised by the development of vertical fractures, which are of a tensile‐shear nature and have a low degree of filling. The formation and evolution of fractures are controlled by the generation of hydrocarbons, denudation, and tensile strain during the sedimentation‐erosion process. Tensile fractures are more likely to occur when the horizontal minimum principal stress is lower than the formation pressure during hydrocarbon generation. During the denudation process, the horizontal minimum principal stress in tight sandstone decreased, facilitating the formation of near‐vertical tensile fractures. At the same time, the strata also produce a stress tensor, with the reduction in sandstone strata being greater than that in mudstone strata. Ultimately, fractures are more developed in reservoirs with high brittle mineral (quartz and feldspar) content in the uplifted and sloped areas of low‐amplitude structures, which is favourable for the accumulation of natural gas. In contrast, fractures in the trough zones are usually underdeveloped, and fractures are extremely developed near the Zijinshan Pluton, which is detrimental to the preservation of natural gas.

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Fracture Modeling Method of Asmari Formation Carbonate Reservoir in G Oilfield, Middle East

Sun,

Hui,

Tong

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Fracture characterization of Asmari Formation carbonate reservoirs in G Oilfield, Zagros Basin, Middle East

Cited by 10 publications

References 27 publications

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Development Characteristics of Fractures in the Upper Palaeozoic Along the Northeastern Edge of the Ordos Basin and Their Controlling Effects on Hydrocarbon Accumulation

Fracture Modeling Method of Asmari Formation Carbonate Reservoir in G Oilfield, Middle East

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