Abstract: The geologic feature of Huoerguos structure in southern margin of Junggar basin is analyzed by focusing on its structural style, hydrocarbon accumulation condition and abnormal high pressure. Study shows that there exist deep and shallow structural styles in Huoerguos structure. Jurassic and Cretaceous are its principal source rocks. Ziniquanz formation of Paleogene is its main reservoir rock featuring thin fine sandstone and siltstone and averaging 2~8 m (12 m in maxmum) of single layer thick ness. Braided delta front subfacies is its sedimentary facies. The pressure is divided into two pressure system. The complex structure and hydrocarbon accumulation model under the condition of abnormal high pressure in southern margin of Junggar basin is proposed based on these analyses.

Key words: Junggar basin, structural reservoir, , abnormal high pressure, hydrocarbon accumulation model