Flat spots represent a hydrocarbon contact seismic response where it is apparently flat. Such contact may be between gas and oil, oil and water, or gas and water. The hydrocarbon reservoir much be thicker than the vertical resolution in order to represent a flat spot. Flat spots are often difficult to find; the edge or base of channels, low angle faults, or processing artifacts can often be misconceived as flat spots. Flat spots may also be caused by low saturated gas in a reservoir.
So DHI are just that. Indicators. And you need to drill to find out IF there are any hydrocarbons. Sasanof had lots of DHI's but no hydrocarbons.
Ann: Sasanof-1 Well Result, page-113
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