Palaeostresses inferred from macrofractures, Colorado Plateau, western U.S.A.

Bergerat, Françoise; Bouroz-Weil, Catherine; Angelier, Jacques

doi:10.1016/0040-1951(92)90378-j

Cited by 25 publications

(14 citation statements)

References 53 publications

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“…Temporal variations in Laramide stress orientations have been proposed [ Chapin and Cather , 1981, 1983; Gries , 1983, 1990; Bergerat et al , 1992). Chapin and Cather [1981, 1983] suggested a change in Laramide compression direction from N70°E to N45°E at 55 Ma, whereas Gries [1983, 1990] suggested a three‐stage rotation of horizontal compression during the Laramide, from approximately E–W (Campanian to Paleocene) to NE–SW (Paleocene) to N–S (Eocene).…”

Section: Geological Settingmentioning

confidence: 99%

Stress and strain patterns, kinematics and deformation mechanisms in a basement-cored anticline: Sheep Mountain Anticline, Wyoming

et al. 2010

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[1] In order to characterize and compare the stressstrain record prior to, during, and just after folding at the macroscopic and the microscopic scales and to provide insights into stress levels sustained by folded rocks, we investigate the relationship between the stress-strain distribution in folded strata derived from fractures, striated microfaults, and calcite twins and the development of the Laramide, basement-cored Sheep Mountain Anticline, Wyoming. Tectonic data were mainly collected in Lower Carboniferous to Permian carbonates and sandstones. In both rock matrix and veins, calcite twins recorded three different tectonic stages: the first stage is a pre-Laramide (Sevier) layer-parallel shortening (LPS) parallel to fold axis, the second one is a Laramide LPS perpendicular to the fold axis, and the third stage corresponds to Laramide late fold tightening with compression also perpendicular to the fold axis. Stress and strain orientations and regimes at the microscale agree with the polyphase stress evolution revealed by populations of fractures and striated microfaults, testifying for the homogeneity of stress record at different scales through time. Calcite twin analysis additionally reveals significant variations of differential stress magnitudes between fold limbs. Our results especially point to an increase of differential stress magnitudes related to Laramide LPS from the backlimb to the forelimb of the fold possibly in relation with motion of an underlying basement thrust fault that likely induced stress concentrations at its upper tip. This result is confirmed by a simple numerical model. Beyond regional implications, this study highlights the potential of calcite twin analyses to yield a representative quantitative picture of stress and strain patterns related to folding.

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Section: Geological Settingmentioning

confidence: 99%

Stress and strain patterns, kinematics and deformation mechanisms in a basement-cored anticline: Sheep Mountain Anticline, Wyoming

et al. 2010

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“…The mechanical origin of fractures (Hancock, 1985;Price & Cosgrove, 1990) indicates the stress regime under which the fractures formed (Engelder & Geiser, 1980;Bergerat et al, 1992) and is a key parameter to understand their impact on reservoir behaviour (Loosveld & Franssen, 1992;Fulljames et al, 1996). The following four mechanical origins are commonly distinguished (Price & Cosgrove, 1990).…”

Section: Fracture Originmentioning

confidence: 98%

Fracture networks in Rotliegend gas reservoirs of the Dutch offshore: implications for reservoir behaviour

Gauthier¹,

Franssen²,

Drei

2000

Netherlands Journal of Geosciences

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Fracture systems of Rotliegend gas fields in and at the margins of the northern Broad Fourteens Basin in the Dutch offshore are described in terms of orientation, frequency, origin and type, and in relation to larger-scale structures. First, fracture data collected from core and image logs have been corrected to account for the bias related to the 1-D sampling. Second, these results were integrated with data on fracture cements and diagenesis in order to assess the timing of the fracture network development. On the basis of their regional extent three phases of fracturing and four orientation trends can be distinguished in the basin:(1) atTriassic times and related to early diagenesis and burial, NW-SE to NNW-SSE and NE-SW to ESE-WNW particulateshear fractures developed; (2) during the Mid-Kimmerian and related to the main burial stage, shear-related and dilational-shear-fault-related fracturing occurred parallel with larger-scale faults; (3) during the Cretaceous and related to uplift, NW-SE and NE-SW joints propagated; a regional joint system developed outside the Jurassic rift basin, preferentially oriented E-W to ESE-WNW; these joints have not been dated accurately. The fault-related shear fractures tend to compartmentalise the reservoirs, whereas the regional joints tend to enhance reservoir flow properties. These fracture systems are thought to play a negative or positive role, respectively, but only in fields with poor reservoir quality. Consequently, in such cases small-scale fractures should be taken into account in field development planning.

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“…The mechanical origin of fractures (Hancock, 1985;Price & Cosgrove, 1990) indicates the stress regime under which the fractures are formed (Engelder & Geiser,1980;Bergerat et al, 1992) and is a key parameter to understand their impact on reservoir behavior (Loosveld & Franssen, 1992;Fulljames et al, 1996).The following four mechanical origins are commonly distinguished (Price & Cosgrove, 1990):…”

Section: Fracture Types and Mode According To Their Kinematicsmentioning

confidence: 99%

Reliable Fracture Characterisation and Value Addition Through Special Core Reorientation: Kuwait Case Study

et al. 2013

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Reliable fracture characterization is essential for efficient field development of tight carbonate reservoirs. A comprehensive campaign of core based fracture analysis was carried out on more than 7,000ft of deep tight carbonate (over 14500ft TVD and 3pu avg. porosity and 0.1 mD avg. perm) cores of Kuwait, spread over a number of wells covering a large area of over 1000sq km.The aim of the study was to provide inputs for a detailed structural analysis of the area, with the help of reorientation of cores focusing on the geometrical and structural characteristics of each well. The reorientation procedure used a special core Goniometry process, which permits a totally hands-free 3D digitization of all planar and linear features. Reorientation of the cores is established using either the deviation data from the wells or through comparison with image log data.In addition to the detailed integrated description of type, size, aperture and filling of fractures, a porosity/permeability model was generated after calculation of fracture frequency. By calculating the orientation and value of the permeability vectors, an indication of optimum direction of drilling was established for each well/area. The natural fracture network obtained with open, partially-open and cemented fractures, together with induced stress-release fractures analysis, contributed to a better understanding of tectonic history and present-day stress in the studied area. A field synthesis map highlighted the main direction of all types of fractures and an actual stress map was worked out by compiling all directions of the maximum horizontal stress observed in the wells and oriented by the petal and centreline induced fractures.The integration of the results with analyses of image log data, well log correlation data and seismic data provided critical information about the reservoir properties.A better understanding of the fracture spatial orientation and fracture properties in the fields has a strong influence on further development plans of the fields in the studied area. TX 75083-3836, U.S.A., fax +1-972-952-9435

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Palaeostresses inferred from macrofractures, Colorado Plateau, western U.S.A.

Cited by 25 publications

References 53 publications

Stress and strain patterns, kinematics and deformation mechanisms in a basement-cored anticline: Sheep Mountain Anticline, Wyoming

Stress and strain patterns, kinematics and deformation mechanisms in a basement-cored anticline: Sheep Mountain Anticline, Wyoming

Fracture networks in Rotliegend gas reservoirs of the Dutch offshore: implications for reservoir behaviour

Reliable Fracture Characterisation and Value Addition Through Special Core Reorientation: Kuwait Case Study

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