A modified fuzzy inference system for estimation of the static rock elastic properties: A case study from the Kangan and Dalan gas reservoirs, South Pars gas field, the Persian Gulf

Ranjbar-Karami, Rasoul; Kadkhodaie, Ali; Shiri, Mahdi

doi:10.1016/j.jngse.2014.10.034

Cited by 22 publications

(1 citation statement)

References 20 publications

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“…Stress-strain curves are simultaneously recorded using a computer and mechanical parameters can be obtained from the curves. Dynamic methods are usually calculations of compressional wave velocities (VP) and shear wave velocities (VS), which can be obtained from logs or in the lab [2,[7][8][9]. Abundant studies regarding the differences between static and dynamic methods have demonstrated that static methods are more direct and realistic, while dynamic methods are easier and more continuous [3,10,11].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Rock Mechanical Properties Using Lab Tests and Numerical Interpretation Model of Well Logs

Zhou

Xie

et al. 2016

Mathematical Problems in Engineering

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The tight gas reservoir in the fifth member of the Xujiahe formation contains heterogeneous interlayers of sandstone and shale that are low in both porosity and permeability. Elastic characteristics of sandstone and shale are analyzed in this study based on petrophysics tests. The tests indicate that sandstone and mudstone samples have different stress-strain relationships. The rock tends to exhibit elastic-plastic deformation. The compressive strength correlates with confinement pressure and elastic modulus. The results based on thin-bed log interpretation match dynamic Young’s modulus and Poisson’s ratio predicted by theory. The compressive strength is calculated from density, elastic impedance, and clay contents. The tensile strength is calibrated using compressive strength. Shear strength is calculated with an empirical formula. Finally, log interpretation of rock mechanical properties is performed on the fifth member of the Xujiahe formation. Natural fractures in downhole cores and rock microscopic failure in the samples in the cross section demonstrate that tensile fractures were primarily observed in sandstone, and shear fractures can be observed in both mudstone and sandstone. Based on different elasticity and plasticity of different rocks, as well as the characteristics of natural fractures, a fracture propagation model was built.

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Section: Introductionmentioning

confidence: 99%

Characterization of Rock Mechanical Properties Using Lab Tests and Numerical Interpretation Model of Well Logs

Zhou

Xie

et al. 2016

Mathematical Problems in Engineering

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Development mode of reverse fault‐associated fractures in deep tight sandstones: A case study in Xinchang Gas Field, Sichuan Basin, China

et al. 2021

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Evaluation of natural fractures is the key issue of the prediction of sweet spots in deep tight sandstones. In this article, taking the tight gas sandstone reservoir of the Xu 2 Member (second member of the Upper Triassic Xujiahe Formation) in Xinchang Gas Field, West Sichuan Depression as an example, we systematically studied the characteristics, formation periods, influencing factors, and developmental mode of fractures using testing results of cores, thin sections, rock mechanics, isotopes, fluid inclusions, and the structural curvature simulation method. The results show that the Xu 2 Member mainly develops vertical and high-angle fractures. The fractures are highly effective and mainly developed in medium-fine-grained sandstone. The secondary minerals in the fractures have multi-stage filling processes. The fluid inclusions are mainly gas-liquid two-phase brine inclusions (secondary inclusions), and with the same crystal, the temperature difference between the brine inclusion and the organic inclusion is 23.7 C. Carbon and oxygen stable isotope tests show that calcite has two mixing stages. In the end, the formation periods of the fractures in the Xu 2 Member were divided into five stages. The influencing factors of fractures in the Xu 2 Member include lithology, fault, layer thickness, and structural deformation. According to geomechanical analysis, we finally established the development mode of reverse fault-associated fractures in the Xu 2 Member.

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Prediction of Young’s modulus of weathered igneous rocks using GRNN, RVM, and MPMR models with a new index

Ceryan

2021

J. Mt. Sci.

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A modified fuzzy inference system for estimation of the static rock elastic properties: A case study from the Kangan and Dalan gas reservoirs, South Pars gas field, the Persian Gulf

Cited by 22 publications

References 20 publications

Characterization of Rock Mechanical Properties Using Lab Tests and Numerical Interpretation Model of Well Logs

Characterization of Rock Mechanical Properties Using Lab Tests and Numerical Interpretation Model of Well Logs

Development mode of reverse fault‐associated fractures in deep tight sandstones: A case study in Xinchang Gas Field, Sichuan Basin, China

Prediction of Young’s modulus of weathered igneous rocks using GRNN, RVM, and MPMR models with a new index

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