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Technical Paper: Characterization of Hydraulically-Induced Fracture Network Using Treatment and Microseismic Data in a Tight-Gas Formation: A Geomechanical Approach

Society: SPE
Paper Number: 125237
Presentation Date: 2009
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Abstract

Large amounts of gas are produced from unconventional tight-gas sand reservoirs and shale gas-bearing formations. These plays are partly technology driven and partly economics driven. Modern well-log evaluation techniques and completion methods are required to yield economic wells. In some cases, microseismic monitoring campaigns are performed in these various low-permeability environments to improve the understanding of the induced fracture network and to go beyond the simple assumption of a symmetric bi-wing fracture system.

To better characterize the induced fracture network, a semi-analytical pseudo 3D geomechanical model was developed based on considerations of the conservation of injected fluid mass and the mechanic interactions both between fractures and injected fluid as well as among the fractures. The hydraulically stimulated volume is represented by a horizontally expanding ellipse containing a simplified fracture network consisting of two sets of vertical planar fractures perpendicular to one another. This model provides a mathematically equivalent description of the process of hydraulic fracture propagation and the characteristics of the induced fractures. 

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