Formation Conditions of the Oil—Bearing Sandbodies of Triassic and Jurassic in Turpan-Hami Basin,Xinjiang

Key words: 
• oil-bearing sandbodies /
• sedimentary facie /
• sedimentary sequence /
• Turpan-Harni basin /

Abstract: Turpan Hami basin is a Mesozoic Cenozoic compound basin with a complex evolutionary history in the Tianshan orogenic belt.It is a typical continental oil and gas bearing basin of coal derived hydrocarbon.Forming oil bearing sandbodies of pre Jurassic(Triassic) oil and gas accumulation in the southern belt of basin is obviously controlled by sedimentary facies,high geothermal gradient and Indo China movement.The pluvial delta sandbodies distributed in the southern basin are the first set of good oil bearing sandbodies because they lie on a suitable place near oil generation center due to strata uplifting in Indo China movement,and had a dynamic foundation of producing secondary porosity as well as trapping early mature oil which heated by magma bodies and Indo China structural heat event.The second,third, fourth set of oil bearing sandbodies of Jurassic in this area are the braided deltas with south terrigenous sediments and pluvial deltas with north terrigenous sedinents,and they have the characteristics of multiple layers of sandbodies,strongly repeated in the upper and lower part,with fairly good original physical quality.They depend on coal measure source rocks and hydrocarbon migrated southwards in short distance.