Characteristics and genesis of petroleum families in Lanping depression

Oil were recently discovered in brecciated limestone,micrite kimestone and dolomitized limestone a ssociated with Jinding lead-zinc deposits. The geochemical characteristics indicate that sourceinputs were multiple. The sedimentary water medium was reducing with high salinity. Thermal evolution is in the stage of mature to high mature cha racterized by highly biodeg radation. Based on the source contributions, biodeg radation modification and environmental medium,three petroleum families were classified.