Geomechanics and geology: introduction

Turner, Jonathan P.; Healy, D.; Hillis, Richard R.; Welch, Michael J.

doi:10.1144/sp458.15

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The above described spatial representation of the discrete fractures also supports a rigorous determination of the hydraulic aperture. In fact, this aperture (Figure 6A) depends upon multiple factors including the orientation of the fractures with respect to the stress field tensors σ 1 , σ 2 , and σ 3 (Bisdom et al, 2016;Turner et al, 2017;Boersma et al, 2021).…”

Section: Fracturing Network Reconstructionmentioning

confidence: 99%

Review of discrete fracture network characterization for geothermal energy extraction

Medici,

Ling,

Shang

2023

Front. Earth Sci.

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Geothermal reservoirs are highly anisotropic and heterogeneous, and thus require a variety of structural geology, geomechanical, remote sensing, geophysical and hydraulic techniques to inform Discrete Fracture Network flow models. Following the Paris Agreement on reduction of carbon emissions, such reservoirs have received more attention and new techniques that support Discrete Fracture Network models were developed. A comprehensive review is therefore needed to merge innovative and traditional technical approaches into a coherent framework to enhance the extraction of geothermal energy from the deep subsurface. Traditionally, statistics extracted from structural scanlines and unmanned aerial vehicle surveys on analogues represent optimum ways to constrain the length of joints, bedding planes, and faults, thereby generating a model of the network of fractures. Combining borehole images with seismic attributes has also proven to be an excellent approach that supports the stochastic generation of Discrete Fracture Network models by detecting the orientation, density, and dominant trends of the fractures in the reservoirs. However, to move forward to flow modelling, computation of transmissivities from pumping tests, and the determination of hydraulically active fractures allow the computation of the hydraulic aperture in permeable sedimentary rocks. The latter parameter is fundamental to simulating flow in a network of discrete fractures. The mechanical aperture can also be estimated based on the characterization of geomechanical parameters (Poisson’s ratio, and Young’s modulus) in Hot Dry Rocks of igneous-metamorphic origin. Compared with previous review studies, this paper will be the first to describe all the geological and hydro-geophysical techniques that inform Discrete Fracture Network development in geothermal frameworks. We therefore envisage that this paper represents a useful and holistic guide for future projects on preparing DFN models.

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Section: Fracturing Network Reconstructionmentioning

confidence: 99%

Review of discrete fracture network characterization for geothermal energy extraction

Medici,

Ling,

Shang

2023

Front. Earth Sci.

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“…Predicting present-day crustal stress magnitude and orientation and the mechanical response of all geological materials to these force fields and their hazards which is critical to the interpretation of continental-scale plate tectonic induced deformations falls within the field of geomechanics (Turner et al, 2017). Though earth stresses act orthogonally in vertical and horizontal directions (Paulsen et al, 2009) in different stress regimes, their magnitude and directions can change where there are geologic structures relative to the structural dip of the formation.…”

Section: Introductionmentioning

confidence: 99%

Paleokinematic reconstruction and wellbore breakout analysis of in situ stress orientation in a Niger Delta Oilfield: Implications for tectonic reactivation in Nigeria

Abija¹

2019

SDRP-JESES

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In this paper tectonics induced syndepositional tensile fracturing, faulting and block kinematics during structural evolution of this tertiary field has been reconstructed and the orientations of present-day horizontal stresses determined. Balanced cross-section using well coordinates and wireline logs correlation to portray the present-day architecture of the deformed geometry and stratigraphy has indicated two flank faults. The stratigraphic section depicts offlapping cyclic sedimentation in the middle to outer neritic environment during the Oligocene-Miocene epoch. Syndeposional shear displacement of the interconnected fractures in NE-SW and NW-SE fault trends indicate the directions of the maximum horizontal stress and present day maximum horizontal stress orientations determined from compressional shear failures in vertical wellbores depict NE-SW, NW-SE and ENE-WSW dominant directions consistent with the major fracture zones in the Gulf of Guinea along which triple-junction rifting into Nigeria's Benue trough aulacogen had occurred. Recent increase of earth tremors in Nigeria occurring in the NE-SW, NW-SE and ENE-WSW directions when correlated with the two tectonic episodes, the Aptian/Albian epeirogenic tectonism and the late Miocene-Pliocene faulting together with the presentday stress orientations all align in the axes of the major fracture zones that separated South America from Africa indicates that intraplate tectonic reactivation due to migration of the African plate along the major fracture zones that cut into Nigeria is imminent.

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2020

Applied Concepts in Fractured Reservoirs

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Geomechanics and geology: introduction

Cited by 4 publications

References 19 publications

Review of discrete fracture network characterization for geothermal energy extraction

Review of discrete fracture network characterization for geothermal energy extraction

Paleokinematic reconstruction and wellbore breakout analysis of in situ stress orientation in a Niger Delta Oilfield: Implications for tectonic reactivation in Nigeria

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