nowadays, the role of conventional or unconventional well log data is to know Formation evaluation. But other problems can be resolved by taking account other special data logs as an example NMR, Imagery etc..
Baouche Rafik, the answer to your question is: Yes, of course!
Full-wave sonic (cross-dipole, better if you are an unconventional scenario) and density logs with core control and elastic properties by seismic inversion (gathers/prestack) and multi-attribute analysis techniques are some critical and habitual tools for an estimate and analysis of the geomechanical behavior of the geology (Reservoir Characterization). The geomechanical analysis provides rock property estimates such as Poisson’s ratio, and Young’s modulus, amongst others.
See for example the paper that I attached, "Advanced drilling in HP/HT: Total´s experience on Elgin/Franklin (UK North Sea)" by J. L. Bergerot, JPT, October 2011.
Best regards, Mario E. Sigismondi
Geomechanical properties derived from well logs may not be sufficient, however, they provide vital indicative properties that can be used as calibration for models. The raw logs (mainly Vp, Vs & density) can be critical input for 3D inversion for rock properties.
Rafik, the answer is yes however. Bear in mind that logs are indirect measurements that are related to stress and mechanical properties using those that might reflect the mechanical condition of the rock. For instance, the density log is related to the overburden and also affects the sonic response of the rock. Therefore, there is an empirical element here that make the algorithms, formulas and correlations variable hence calibration is required whenever possible, the results are estimations (but very accurate). Alternatively, you can consider using Data engineering to do some of the geomechanical tasks, we use www.strata-mecanica.co to get some data depending on the location where we are working. I hope it helps, best regards
Dear Juan Tovar, Absolutely agree with you, insofar as logs are indirect methods and thank you very much for your very constructive recommendations.
I think the geomechanical studies using the well log analysis can reflect the real problems in the oil and Gaz Reservoirs of the Field, but the geomechanical model should be calibrated by laboratory experiments.
Yes, definitely you can build 1-D geomechanical model and do further analysis such as wellbore stability, mud weight design, based on wireline logs. As previous authors have mentioned that these are estimated properties, therefore calibration is essential in the given geological setup. If no calibration checkpoints are available, you can perform probabilistic analysis of geomechanical estimation and derive P10, P50, and P90 scenarios. This is the standard practice like mud weight design, Mohr-Coulomb failure analysis, etc.
Yes, well log analysis can give good results in geomechanical studies, and that results will be more reliable if calibrated with laboratory tests on core samples.
NMR method is mainly focused for law resistivity problem to resolve true water saturation calculated in front of oil formation
Hello dear Baouche Rafik
Have a great time!
Certainly not. Due to the complexity of the geological problems of the reservoirs, more complete and comprehensive information is needed to reach a conclusion and understand the geomechanical problems. Using log information, a one-dimensional MEM can be constructed, and some parameters and geomechanical problems can be estimated.
But keep in mind that this method is suitable for around wells, although sometimes adaptive methods are used between wells to estimate the properties of the reservoir, due to the complex geological factors and parameters of this method is understandable do not give us.
However, production and exploration wells information can be integrated with seismic information and a comprehensive three-dimensional model of the reservoir area can be modeled.
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