ANALYSIS OF TECTONIC EVOLUTION AND OIL-GAS RESERVOIR FORMATION CONDITIONOF HESHITUOLUOGAI BASIN IN NORTHWEST XINJIANG

Heshituoluogai Basin is an Early Mesozoic of the northwest thrusting folded zone of Junggar in Xinjiang,China.The basin rudiment formed because of extrusion and over thrusting during Indo-Chinese epoch;regional extensionmade basin deposit thick early and medium Jurassic formation,basically forming the pattem with steep slopeand down warping central region;during late Yanshan epoch and Himalayan epoch,the South border of basin overthrust Junggar Basin and was completely separated.As lower exploration degree,oil-gas reservoir formation conditionlack systematic and thoroughgoing research.Based on the oil-gas geological theory,the basic element of oil-gasreservoir,including hydrocarbon source rock condition,reservoir condition and cap rock condition,trap conditionand migration condition,etc.,are analyzed in this paper.Heshituoluogai Basin has fairly good hydrocarbon sourcerock,many reservoir-seal assemblages,different types trap and compound passage system,the basic element ofoil-gas reservoir formation,and Good prospects for the gas and oil exploration.