Downhole microseismic and downhole tiltmeter mapping are the primary direct diagnostic techniques for monitoring the geometry of hydraulic fractures at depth. Although these techniques have seldom been used together because of a lack of available monitor wells, the advent of new hybrid arrays having both microseismic receivers and downhole tiltmeters has now made application of both technologies from a single well possible. This paper discusses algorithms for joint inversion of the combined data along with the development of hybrid arrays for combined tiltmeter and microseismic. Examples from several data sets show how the combined results can be used to improve velocity models and obtain better constrained-height estimates, as well as improved confidence in other fracture geometry parameters.

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