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  1.  20
    Integrated Rock Classification in the Wolfcamp Shale Based on Reservoir Quality and Anisotropic Stress Profile Estimated From Well Logs.Aderonke Aderibigbe, Clotilde Chen Valdes & Zoya Heidari - 2016 - Interpretation: SEG 4 (2):SF1-SF18.
    Reliable rock classification is the key to identify target zones for successful hydraulic fracturing stimulation treatment in unconventional reservoirs such as organic-rich mudrocks. Such a rock classification scheme should take into account geologic attributes, petrophysical, and geomechanical properties to improve the likelihood of successful fracture treatment. However, conventional rock classification methods do not take into account stress gradients in the formation. We have developed a new rock classification technique that integrates four rock classification schemes based on the geologic facies, reservoir (...)
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  2.  11
    Rock Classification in the Haynesville Shale Based on Petrophysical and Elastic Properties Estimated From Well Logs.Mehrnoosh Saneifar, Alvaro Aranibar & Zoya Heidari - 2015 - Interpretation: SEG 3 (1):SA65-SA75.
    Rock classification can enhance fracture treatment design for successful field developments in organic-shale reservoirs. The petrophysical and elastic properties of formations are important to consider when selecting the best candidate zones for fracture treatment. Rock classification techniques based on well logs can be advantageous compared to conventional ones based on cores, and they enable depth-by-depth formation characterization. We developed and evaluated three rock classification techniques in organic-shale formations that incorporate well logs and well-log-based estimates of elastic properties, petrophysical properties, mineralogy, (...)
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  3.  9
    Inversion-Based Method for Estimating Total Organic Carbon and Porosity and for Diagnosing Mineral Constituents From Multiple Well Logs in Shale-Gas Formations.Zoya Heidari & Carlos Torres-Verdín - 2013 - Interpretation: SEG 1 (1):T113-T123.
    Reliable estimates of petrophysical and compositional properties of organic shale are critical for detecting perforation zones or candidates for hydro-fracturing jobs. Current methods for in situ formation evaluation of organic shale largely rely on qualitative responses and empirical formulas. Even core measurements can be inconsistent and inaccurate when evaluating clay minerals and other grain constituents.We implement a recently introduced inversion-based method for organic-shale evaluation from conventional well logs. The objective is to estimate total porosity, total organic carbon, and volumetric/weight concentrations (...)
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  4.  5
    Impact of Anisotropic Poroelastic Parameters Estimated Using Well Logs and Core Measurements on Stress Prediction in Organic-Rich Mudrocks.Clotilde Chen Valdes, Aderonke Aderibigbe & Zoya Heidari - 2016 - Interpretation: SEG 4 (3):T359-T372.
    The evaluation of rock mechanical properties in organic-rich mudrocks is challenging because of their heterogeneity, anisotropy, and complex lithology. Hence, geomechanical analysis should include a complete definition of the anisotropic elastic stiffness coefficients for stress prediction. Furthermore, typical assumptions made for poroelastic parameters, such as assuming that Biot’s parameter is equal to one, can result in unreliable geomechanical evaluation for stress prediction and failure in completion design. Our objectives included estimating anisotropic elastic properties and anisotropic poroelastic parameters and minimum horizontal (...)
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  5.  7
    Inversion-Based Detection of Bed Boundaries for Petrophysical Evaluation with Well Logs: Applications to Carbonate and Organic-Shale Formations.Zoya Heidari & Carlos Torres-Verdín - 2014 - Interpretation: SEG 2 (3):T129-T142.
    Petrophysical interpretation of well logs acquired in organic shales and carbonates is challenging because of the presence of thin beds and spatially complex lithology; conventional interpretation techniques often fail in such cases. Recently introduced methods for thin-bed interpretation enable corrections for shoulder-bed effects on well logs but remain sensitive to incorrectly picked bed boundaries. We introduce a new inversion-based method to detect bed boundaries and to estimate petrophysical and compositional properties of multilayer formations from conventional well logs in the presence (...)
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    Multiscale Characterization of Pore Structure in Carbonate Formations: Application to the Scurry Area Canyon Reef Operators Committee Unit.Emmanuel Oyewole, Mehrnoosh Saneifar & Zoya Heidari - 2016 - Interpretation: SEG 4 (2):SF165-SF177.
    Carbonate formations consist of a wide range of pore types with different shapes, pore-throat sizes, and varying levels of pore-network connectivity. Such heterogeneous pore-network properties affect the fluid flow in the formation. However, characterizing pore-network properties in carbonate formations is challenging due to the heterogeneity at different scales and complex pore structure of carbonate rocks. We have developed an integrated technique for multiscale characterization of carbonate pore structure based on mercury injection capillary pressure measurements, X-ray micro-computed tomography 3D rock images, (...)
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