ANALYSIS ON THE CONDITIONS OF PETROLEUM ACCUMULATION IN WEIXINAN SAG, BEIBUWAN BASIN

Many oil and gas fields or hydrocarbon-bearing structures have been discovered in Weixinan sag which is located in the southwest of Beibuwan basin. After we studied characteristics of the structures and sedimentary layers with the theory of petroleum geology,we gave our analysis results with the emphasis put upon oil accumulation elements such as source rocks, reservoir formations, traps, and transport media, and came to the conclusion that Weixinan sag has good source rocks, series of oil and reservoir formations, and abundant traps and transport media, and thus the sag possesses basic conditions for forming petroleum reservoirs and has cheerful prospect.