Abstract
This paper shows the concept, methodology, and utility of “trend-surface analysis” in petroleum geology using Japanese well data. Three Miocene-Pliocene strata are analized. First-degree trend-surface maps show the general trend of the thickness change and some suggestions on basin development. Third-degree trend-surface maps portray the syndepositional high and the basin center (axis). Third-degree residual maps show distinct negative belts. Close relationship is reasoned between those belts and the accumulation of hydrocarbons in the Shonai Basin.
