Fracture Initiation Model of Shale Fracturing Based on Effective Stress Theory of Porous Media

<div>Coordinate system transformation. (a) The principal stress coordinate system transforms to the geographic coordinate system. (b) The geographic coordinate system transforms to the borehole coordinate system.</div>

Geofluids

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Figure 1

Figure 1: Fracture Initiation Model of Shale Fracturing Based on Effective Stress Theory of Porous Media 