On new world, generated on latest build. Seismic Prospector + some explosives, using Data Stick. 0 Oil. Same Prospector + 2-nd portion of explosives, using another Data Stick. And voila, some amount of Oil found. It works the same if 2-nd scan made via another Seismic Prospector in same chunk. Seems like something broken with reading data from chunk for the first time.