Effects of sedimentary interfaces on fracture pattern, linkage, and cluster formation in peritidal carbonate rocks

Larsen, Belinda; Guðmundsson, Ágúst; Grunnaleite, Ivar; Sælen, Gunnar; Talbot, Michael R.; Buckley, Simon J.

doi:10.1016/j.marpetgeo.2010.03.011

Cited by 51 publications

(12 citation statements)

References 43 publications

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“…It is common for terrestrial lidar-based fracture studies to constrain orientations and delineate sets solely on the basis of fractures with well-developed surfaces (e.g. Kemeny et al 2006;Sturzenegger & Stead 2009b;Larsen et al 2010). Even when fracture traces are considered, it is usually in order to (a) Illustration of the three-point approach used to resolve the orientation of a subvertically orientated fracture from a trace expressed across a perfectly planar surface.…”

Section: Advantages Of Using Subsurface Digital Outcrop Modelsmentioning

confidence: 99%

Comparison of digital outcrop and conventional data collection approaches for the characterization of naturally fractured reservoir analogues

Seers

Hodgetts

2013

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In this study, fracture systems developed within faulted, high-porosity sandstones in the decommissioned mines of Alderley Edge, Cheshire, UK are characterized using lidar (Light Detection And Ranging)-based analysis. The geometry of the mine workings prove to be conducive to the extraction of fracture attributes, whilst providing a degree of exposure of a notable Triassicaged reservoir outcrop analogue (Helsby Sandstone Formation) not afforded at the surface.To test the fidelity of the approach, fracture statistics generated from lidar-derived digital outcrop models are compared to an equivalent dataset collected using conventional manual surveys, with digital outcrop and manually acquired fracture attributes used to populate discrete fracture network models. These are upscaled to provide equivalent porous medium properties, enabling the impact of uncertainties introduced into fracture modelling workflows by lidarbased techniques to be assessed.Whilst broadly comparable to fracture attributes obtained using manual surveys, the systematic underrepresentation of fracture properties is observed within lidar-derived dataset, resulting in the underestimation of fracture network flow capacity. The study results suggest that, whilst enhancing data acquisition rates and coverage of exposure surfaces, the use of digital discontinuity analysis may introduce additional biases into fracture datasets, increasing the level of uncertainty within resultant modelled networks.

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Section: Advantages Of Using Subsurface Digital Outcrop Modelsmentioning

confidence: 99%

Comparison of digital outcrop and conventional data collection approaches for the characterization of naturally fractured reservoir analogues

Seers

Hodgetts

2013

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“…With the constant improvement of stimulation technology in the horizontal well, the scale number and stage quantity in multi-staged fracturing increased. The interference effect among multiple fractures changed the stress field of the original wall rock [17], [18]. Thus, examining the mechanism of induced stress, establishing an induced stress field mathematical model, and analyzing the influencing factors are crucial in investigating the fracture initiation regularity of shale reservoirs in a horizontal well.…”

Section: Fracture Pressure Prediction Model Under Multiple Fractures mentioning

confidence: 99%

Mechanism Analysis on Hydraulic Fracture Initiation under the Influence of Induced Stress in Shale Gas

Liu¹,

Lou²,

Chen³

et al. 2016

JESTR

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To study the fracture network propagation mechanism in shale gas reservoirs and determine the influence of induced stress from the growth of multiple fractures, this paper describes the crack initiation pattern in a shale reservoir based on a core laboratory experiment and volume fracturing concept. In accordance with linear elastic fracture mechanics and based on the mathematical model of induced stress field with single fracture as reference, the rock surrounding stress equation of multiple fractures in a horizontal well was deduced. Prediction models of fracture pressure under different initiation patterns were established. Induced stress correction factor was proposed to simplify and correct the prediction models. Results demonstrate that the mechanical parameters of rock directly affect the fracture initiation pattern in shale reservoirs. Tensile failure on the bedding surface primarily occurs, along with shear slippage damage for brittle rocks, whereas shear was mainly observed in plastic rocks. The morphology and distribution of fractures are closely related to induced stress field. Simulation results show that induced stress is positively correlated with fracture height and negatively correlated with fracture interval. Dimensionless fracture interval between one to two is the "gold window" to create a fracture network in fracturing design. Minimum induced stress occurs at 30° and 150° with the minimum horizontal stress direction. The study significantly contributes in the research of crack initiation law and optimization of fracture design.

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“…Incorporation of fractures into layer interfaces formed further, larger normal faults by using the interfaces as parts of their paths (e.g. GRAHAM et al 2003;AGOSTA and AYDIN 2006;LARSEN et al 2010;GUDMUNDSSON 2011). The linkage of fractures with layer contacts may cause contact sliding and/or opening (Figs.…”

Section: Effect Of Mechanic Layeringmentioning

confidence: 99%

Effects of Physical Processes and Sampling Resolution on Fault Displacement Versus Length Scaling: The Case of the Cantarell Complex Oilfield, Gulf of Mexico

Nieto-Samaniego

Murillo-Muñetón

et al. 2015

Pure Appl. Geophys.

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In this paper, we first review some factors that may alter the fault D max /L ratio and scaling relationship. The three main physical processes are documented as follows: (1) The D max /L ratio increases in an individual segmented fault, whereas it decreases in a fault array consisting of two or more fault segments. This effect occurs at any scale during fault growth and in any type of rock. (2) Vertical restriction decreases the D max /L ratio along the fault strike due to mechanical layers. (3) The D max /L ratio increases or decreases due to fault reactivation depending on the type of reactivation. Thus, using data from the normal faults of the Cantarell oilfield in the southern Gulf of Mexico, we document that the displacement (D max ) and length (L) show a weak correlation of linear or power-law scaling, with exponents that are much less than 1 (n & 0.5). This scaling relation is due to the combination of the physical processes mentioned above, as well as sampling effects, such as technique resolution. These results indicate that sublinear scaling (n & 0.5) can occur as a result of more than one physical process during faulting in a studied area. In addition to the physical processes associated with brittle deformation in the studied area, the sampling resolution dramatically affects the exponents of the D max -L scaling.

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Effects of sedimentary interfaces on fracture pattern, linkage, and cluster formation in peritidal carbonate rocks

Cited by 51 publications

References 43 publications

Comparison of digital outcrop and conventional data collection approaches for the characterization of naturally fractured reservoir analogues

Comparison of digital outcrop and conventional data collection approaches for the characterization of naturally fractured reservoir analogues

Mechanism Analysis on Hydraulic Fracture Initiation under the Influence of Induced Stress in Shale Gas

Effects of Physical Processes and Sampling Resolution on Fault Displacement Versus Length Scaling: The Case of the Cantarell Complex Oilfield, Gulf of Mexico

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