Yes, it is indeed possible to use machine learning (ML) and deep learning (DL) techniques to interpret facies or enhance their accuracy using only well log data. In recent years, ML and DL have become increasingly popular in geoscience applications, including facies classification and reservoir characterization. Well logs provide valuable continuous data that can be leveraged using these advanced techniques to achieve more accurate and automated interpretations.

Yes, it is possible. It is a standard practice around me, at least when medium (25 wells) to very large (1000s wells) dataset and medium to good quality interpretations are sought. High quality for one or few wells still pretty much remains a "manual" thing. Proprietary workflows are used in TotalEnergies. Not being very close to the activity, I do not have a clear idea of the commercial or open source offering in domain.

Yes. There are quite a few companies in the O&G sector already implementing similar approaches.