Estimation of In Situ Stress State and Rock Properties
Harvey Rock Physics uses a proprietary technique to compute the stress tensor orientation from the borehole image data. The tensor is represented by the two horizontal and vertical orientation components. The results are displayed as a depth-indexed plot that includes polar plots illustrating the maximum stress orientation. The excerpt shown illustrates the generated borehole ovality orientation curves, ovality ratio, and hardness profile.
When synthesized with a petrophysical model, HRP is able to include stress magnitudes for the horizontal and vertical stress components.
Full wave sonic and density data acquired from the borehole as well as open hole logs that can include gamma ray, resistivity and neutron measurements are used to provide a petrophysical model. This model estimates pore space and lithology type.
Mechanical rock properties are estimated by imputing the petrophysical model and calculating the elastic properties. These are combined with the estimated maximum stress orientation to estimate the far field horizontal stress magnitudes and the vertical stress magnitude.
HRP combines the stress magnitudes as computed from the open hole logs with the computed stress orientations from the borehole images through a series of tensor optimization calculations that identify the real-world orientation of the principal stresses: Sigma 1, 2 and 3.
An example of the completed interpretation is shown below.
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