Abstract:

Well Kong 3 is located in Kong buried ancient mountain structure in dagang exploration region, research shows that oil in the well is from source rocks of Ordovician, geochemical analysis indicates that the average organic carbon of Ordovician limestone is 0.14%, chloric bitumen A is 0.11%, total hydro carbon is 57.6 ppm, which means bottom limits of organic rich ness of source rock have been reached, and data from some rocks have been ranked in good to relatively good range. The kerogen is mainly typeⅡ1,Ⅰ1andⅡ2, most of organic samples belongs to matured to highly matured evolution. This shows an important significance for exploration of primitive reservoir in dagong region.

Key words: source rock, evaluation, geochemical characteristics, Ordovician, Dagang region