Microseismic monitoring in lenticular tight gas formations has a number of challenging issues associated with both analysis and interpretation. The heterogeneous nature of the reservoir and the typically small microseismic-event amplitudes make it essential to understand the limits of interpretation that should be applied in these reservoirs. With proper care, fracture lengths and azimuth, along with zonal coverage, are readily obtainable. However, fracture-height growth in these complex reservoirs needs to be carefully assessed. Microseismic data provides a level of self-QC potential through the use of a magnitude-distance assessment to guide interpretation and design. Hydraulic fractures observed in these reservoirs tend to be long penetrating fractures that wander through the distributed-sand lenses, with modest height growth in most projects.

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