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Deep learning techniques are increasingly being considered for geological applications where—much like in computer vision—the challenges are characterized by high-dimensional spatial data dominated by multipoint statistics. In particular, a novel technique called generative adversarial networks has been recently studied for geological parametrization and synthesis, obtaining very impressive results that are at least qualitatively competitive with previous methods. The method obtains a neural network parametrization of the geology—so-called a generator—that is capable of reproducing very complex geological patterns with dimensionality reduction of several orders of magnitude. Subsequent works have addressed the conditioning task, i.e., using the generator to generate realizations honoring spatial observations (hard data). The current approaches, however, do not provide a parametrization of the …