Often an explorer looking for gold finds something else like copper or nickel. Oil however is generally found in a different environment. H2 is created through serpentinization in areas more prone to mineral discovery.
As a prospector myself, this is false. Assays are expensive for traditional minerals and we never assay for hydrogen as that requires a totally different set of procedures.
Orange hydrogen is a theorized method of water fracking/stimulating ultramafic rock bodies to speed up the chemical reaction creating H2.