Response of fractured rock subject to fluid injection Part II. Characteristic behaviour

Harper, T.R.

doi:10.1016/0040-1951(90)90057-f

Cited by 27 publications

(6 citation statements)

References 2 publications

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“…The bedding plane slip model also explains commonly observed repeated events (multiplets) in a similar location in the vicinity of the opened fracture with very similar source mechanisms. Although the horizontal fault plane is less likely to slip using a simple geomechanical model (Zoback, ), the weak bedding planes can explain why this plane can slip, as has been shown in many geomechanical models: Chuprakov and Prioul (), Gu et al (), and Harper and Last ().…”

Section: Interpretation—the Bedding Plane Slip Modelmentioning

confidence: 94%

Seismicity Induced by Hydraulic Fracturing in Shales: A Bedding Plane Slip Model

Staněk

Eisner

2017

JGR Solid Earth

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Passive seismic monitoring of microseismic events induced in oil or gas reservoirs is known as microseismic monitoring. Microseismic monitoring is used to understand the process of hydraulic fracturing, which is a reservoir stimulation technique. We use a new geomechanical model with bedding plane slippage induced by hydraulic fractures within shale reservoirs to explain seismicity observed in a typical case study of hydraulic fracturing of a shale gas play in North America. Microseismic events propagating from the injection point are located at similar depths (within the uncertainty of their locations), and their source mechanisms are dominated by shear failure with both dip‐slip and strike‐slip senses of motion. The prevailing dip‐slip mechanisms have one nearly vertical nodal plane perpendicular to the minimum horizontal stress axis, while the other nodal plane is nearly horizontal. Such dip‐slip mechanisms can be explained by slippage along bedding planes activated by the aseismic opening of vertical hydraulic fractures. The model explains the observed prevailing orientation of the shear planes of the microseismic events, as well as the large difference between seismic and hydraulic energy.

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Section: Interpretation—the Bedding Plane Slip Modelmentioning

confidence: 94%

Seismicity Induced by Hydraulic Fracturing in Shales: A Bedding Plane Slip Model

Staněk

Eisner

2017

JGR Solid Earth

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“…The simulation results also showed that the diffusion in the matrix may have a significant effect on the overall transport behavior. Last and Harper (1990a,b) and Harper and Last (1990) developed a numerical model to investigate the response of fractured rocks to fluid injection. Discrete element method, similar to that of Cundall and Strack (1979), was used to study the mechanics of naturally fractured reservoirs subject to a constant rate of fluid injection.…”

Section: Introductionmentioning

confidence: 99%

A new friction factor correlation for laminar, single-phase flows through rock fractures

Nazridoust

Ahmadi

Smith

2006

Journal of Hydrology

107

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“…Hydraulic fracture stimulation treatments were simulated here simply by imposing an approximately steady-state (elliptical) region of pore pressure change around each injection point, which results in similar stress changes around the injection points (perforations). This aids the efficiency of the simulations and simplifies the interpretation of results by removing the inevitable uncertainty associated with the pressure distribution that develops around an injection location (Harper & Last 1990) in real situations. Ten sequential stages spaced by 100 m along a hypothetical lateral aligned with the azimuth of the minimum stress were simulated.…”

Section: Summary Of the Numerical Testsmentioning

confidence: 98%

“…Otherwise, simulation of stress transmission is either confined to the seismogenic source structure and greatly simplified using a Burridge-Knopoff model (Baisch et al 2009) or omitted (e.g. Hummel & Shapiro 2010) with few exceptions (Pine & Batchelor 1984;Harper & Last 1989;Last & Harper 1990). Some processes that might occur are not normally taken into account, such as small stress changes induced in the reservoir at locations remote from the pressure disturbance or a time-dependence brought about by low rates of fluid flow into dilating fractures in low-permeability rocks such as shales.…”

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confidence: 99%

Effective stress history and the potential for seismicity associated with hydraulic fracturing of shale reservoirs

Harper

2014

JGS

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The influence of effective stress history on reservoir stability and the response to hydraulic fracturing are simulated for two hypothetical shale reservoirs. It is numerically demonstrated that the effective stress history influences the present-day stability of faults and natural fractures. Any assumption of a homogeneous stress state is shown to be unrealistic in the majority of fractured shale reservoirs. The simulations demonstrate that, depending upon the effective stress history, shear displacements can be induced by stress changes associated with stimulation without a change of fluid pressure in the destabilized fractures. Elastoplastic shale and other fractured reservoirs are shown to have a memory of past geomechanical states. These numerical findings demonstrate the value of interpreting reservoir effective stress history when planning fluid injection. A previous case history is summarized to illustrate the overwhelming dependence of stress history analyses on a wide spectrum of earth science disciplines. It also illustrates the application of stress history analyses to activities other than hydraulic fracturing. The current inexperience of effective stress history description means that new approaches must be identified to optimize the necessary multidisciplinary investigations.

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Response of fractured rock subject to fluid injection Part II. Characteristic behaviour

Cited by 27 publications

References 2 publications

Seismicity Induced by Hydraulic Fracturing in Shales: A Bedding Plane Slip Model

Seismicity Induced by Hydraulic Fracturing in Shales: A Bedding Plane Slip Model

A new friction factor correlation for laminar, single-phase flows through rock fractures

Effective stress history and the potential for seismicity associated with hydraulic fracturing of shale reservoirs

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