Mj. Thiercelin et Ra. Plumb, CORE-BASED PREDICTION OF LITHOLOGIC STRESS CONTRASTS IN EAST TEXAS FORMATIONS, SPE formation evaluation, 9(4), 1994, pp. 251-258
This paper presents an evaluation of two fundamentally different stres
s models: an elastic model, which is based on linear transverse isotro
pic elasticity, and a failure model, which is based on the concept tha
t rocks are in an equilibrium state of shear failure. The models are e
valuated by using physical parameters measured on core, pore pressure,
and in-situ stress data from the Gas Research Institute (GRI) Staged
Field Experiments (SFE's) in east Texas. It is shown that the elastic
and failure models provide satisfactory predictions for most of the li
thologies encountered. However, the failure model is more accurate for
predicting stress in soft shales. An example of stress predictions ba
sed on log-derived elasticity parameters that gives stress estimations
comparable to core-based predictions is also shown.