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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Natural fractures"”.
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A novel diagnostic fracture injection test workflow considering natural fractures
… the pressure response. The presence of natural fractures can heavily influence the pre- and post-shut in pressure data obtained from DFIT. Traditional DFIT models do not capture the complexity of hydraulic and natural fracture networks into an integrated workflow. This work uses an …
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Model for a Shale Gas Formation with Salt-Sealed Natural Fractures
… study suggests that dissolution of salt-sealed natural fractures in the shale offers a novel explanation for the early boundary dominated flow. We first discuss a plausible diagenetic history for generation of a salt-sealed natural fracture system in shale gas and how core, log, and conventional …
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Mechanisms of Interaction Between Hydraulic and Natural Fractures in Shale Rocks
… the interaction between hydraulically induced fractures and pre-existing natural fractures in geologic formations is key for optimizing subsurface energy systems that rely on fluid injection into fractured rocks. These include Enhanced Geothermal Systems (EGS), CO₂ sequestration, hydrogen …
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New coupling considerations between matrix and multiscale natural fractures in unconventional resource reservoirs
Includes bibliographical references (pages 74-78).
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Application of the Finite Element Method to Solve Coupled Multiphysics Problems for Subsurface Energy Extraction
Fractures are a source of extra compliance in the rock mass. Fracture compliance can estimate the fracture roughness and the type of fluid filling the fracture. The focus of this research study in chapter 2 is to illustrate how the compliance ratio of rough fractures can diverge from the compliance …
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Mechanical stratigraphy of the Vaca Muerta Formation, Neuquén Basin, Argentina
… logs were interpreted to study pre-existing natural fractures, and a stability assessment was conducted to estimate the reactivation potential of the identified natural fractures. The comparison results in the characterization of an interval with clear vertical trends between an upper, …
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Some rock mechanics problems with application for hydraulic fracturing
… the hydraulic fracture (HF) and pre-existing natural fractures (NF) or faults. The technique is most effective when the hydraulic fracture crosses natural fractures rather than arresting on them. Experiments conducted to examine the interaction between HF and artificial pre-existing faults …
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Interpretation and Fracture Characterization of Early-Cretaceous Buda Limestone Formation Using Post-Stack 3D Seismic Data in Zavala County, Texas
<p>The Buda Limestone is a naturally fractured Early Cretaceous carbonate formation in south Texas which unconformably underlies the Eagle Ford Shale. Matrix porosity of the Buda is less than 6%, therefore natural fractures improve the potential for commercial hydrocarbon production from this tight …
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Structure Segmentation and Transfer Faults in the Marcellus Shale, Clearfield County, Pennsylvania: Implications for Gas Recovery Efficiency and Risk Assessment Using 3D Seismic Attribute Analysis
… gas reservoir in the oil and gas industry. Fractures within this organic-rich black shale serve as an important component of porosity and permeability useful in enhancing production. Horizontal drilling is the primary approach for extracting hydrocarbons in the Marcellus Shale. Typically, …
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Structural and stratigraphic controls on fracture distribution within sand bodies of the Upper Iles and Lower Williams Fork formations, Mamm Creek and Divide Creek fields, Piceance Basin, Colorado
… itself as one of the more prolific producers of natural gas in the Rocky Mountain Region. In the Piceance Basin, the most significant producing intervals within the Mesaverde Group are the Iles and Williams Fork Formations, which provide key reservoir and source aspects of the Mesaverde total …
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Simulation and optimisation of hydraulic fracturing and flowback in unconventional reservoirs: A case study in the Cooper Basin, South Australia
… was predicted. 3. Because of pre-existing natural fractures and the complex stress regime, there is usually high Near-Wellbore Pressure Loss (NWBPL) and pressure dependent leak-off during hydraulic fracturing. In this thesis, tortuosity around the wellbore was found as the main reason and …
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Uncertainty quantification of unconventional reservoirs using assisted history matching methods
… the second application, we assess the effect of natural fractures on UQ of a single horizontal well in the middle Bakken. This is achieved by comparing four AHM scenarios with increasingly varying natural-fracture intensity. Results of the first study show that, based on pre-set acceptance …
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Stress prediction, fracture detection, and multiple attribute analysis of seismic attributes in a Barnett Shale gas reservoir, Fort Worth Basin, Texas
… hydraulically stimulated. The study area is a natural gas producing area of the Barnett Shale in the Fort Worth Basin of North Texas. To facilitate this project, EOG provided RCP with electric well logs, 3D P-wave seismic, microseismic, and engineering data from the area of the Barnett Merge 1 …
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Microseismic mapping and source characterization for hydrofracture monitoring : a full-waveform approach
… occurs predominantly by shearing along natural fractures subparallel to the average fracture trend. Finally, the full-waveform based complete moment tensor inversion method is applied to a dual-array hydrofracture monitoring dataset in Barnett shale at Fort Worth Basin. The determined …
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Inversion of azimuthal velocity and amplitude variations for seismic anisotropy
Natural fractures can play a key role in production of hydrocarbon in the form of increased porosity and permeability for efficient fluid flow especially for unconventional reservoirs of low matrix permeability. Thus, knowledge related to fracture orientation and intensity is vital for the …
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Numerical Simulation of pressure Transient Analysis in Tight Formation and Field Data Categorization and Typical Well Production Data Analysis
… oil and gas commercially from tight formations, naturally completed (open-holed) or cased horizontal wells with multi-stage hydraulic fractures are the most popular implementation for completion. The use of a combination of the multi-fractured horizontal wells is expected to create a complex …
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Controls on deposition, lithologic variability, and reservoir heterogeneity of prolific western interior shelf sandstone reservoirs: Tocito and El Vado sandstones, San Juan Basin, NM
… shelf sand that produces in vertical wells from natural fractures and extends deep into the SJB. Despite being commonly encountered in wells as stacked reservoir intervals, the Tocito Sandstone and El Vado Sandstone are lithologically unique, stratigraphically separate and require different …
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Comprehensive evaluation of a novel EOR method-coupling low salinity water flooding and preformed particle gel to enhance oil recovery in fractured reservoirs
… low due to their extreme heterogeneity caused by natural fractures and the nature of oil-wet matrix. Also, oil recovery from fractured sandstone reservoirs is often low due to areal heterogeneity. Gel treatments have proven to be a successful and inexpensive fluid diversion method when used to …
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Evaluation of the performance of different polymer gel systems as an in-depth gel treatment using numerical simulation
<p>"Oil production from heterogeneous and naturally fractured reservoirs are usually hindered due to the presence of high-permeability streaks and natural fractures networks. Oil production could be more lowered if there is a crossflow from the high- to the low-permeability layers and high mobility …
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Development of a numerical technique for modelling of multi-stage hydraulic fracturing in shale reservoirs
… (HF) stimulation. What significantly affects the fractures arrangement, and associated geometries is the stress field changes, referred to as “stress shadowing”. In this dissertation, in order to present a numerical technique, which is capable of capturing the non-planar hydraulically driven crack …
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