Abstract: The problems in study of inorganic theory at present are discussed. It is pointed out that the research on inorganic theory is still in stage of geological demonstration. It should deflower from continental oil source theory and source-controlled theory, dealing with the origin environment and lithology of source rocks and then studying the migration and accumulation of hydrocarbons. Of course, the physicochemical features of inorganic oil source should be distinguished absolutely. The geologic analysis shows that in Xia-38 oilfield of Jiyang depression in Bohai Bay basin, diabase is a possible source rock and crude from it could be inorganic oil. In other depressions near Jiyang depression might find out the similar oilfields to Xia-38. To discuss the origin environment of diabase should not only be paid attention to the mantle plume, but also to the transport faults occurred during magma activation. Also, the geochemistry of light oil of Neogene in Bohai Bay basin is particularly researched in order to attain the geochemical evidences of inorganic sources.

Key words: inorganic source, source rock, Bohai Bay basin, Huimin sag, diabase